Protocol Registries

Protocol parameter registries represent the authoritative record of many of the codes and numbers contained in a variety of Internet protocols. We maintain these records in compliance with the associated technical standards and allocation policies, and we provide this service in coordination with the Internet Engineering Task Force (IETF).

To view or download individual protocol registries, navigate to the individual registries through the index below. Registry data is available for bulk retrieval via Rsync (recommended) or FTP.

To obtain a registration in an existing registry, or to modify existing registrations, consult the relevant application form. For information on creating new registries, please see RFC 8126 for guidance.

Protocol/Registry Defining Document/Comments
Access Node Control Protocol (ANCP)
RFC 6320
Standards Action
RFC 6320
Standards Action
RFC 6320
Standards Action
RFC 6320
0x0-0xFFF: IETF Review.
0x1000-0xFFFFFF: Specification Required.
RFC 6320
0x0000-0x1FFF: IETF Review.
0x2000-0xFFFF: Specification Required.
ACL TLS
RFC 9761
Expert Review Dan Wing Per Andersson
RFC 9761
Expert Review Dan Wing Per Andersson
RFC 9761
Expert Review Dan Wing Per Andersson
Ad Hoc On Demand Distance Vector (AODV) Parameters
RFC 3561
Standards Action
Address Family Numbers
RFC 2453, RFC 2677, RFC 2858
1-16383: Standards Action.
16384-32767: First Come First Served.
Address Resolution Protocol (ARP) Parameters
RFC 826, RFC 5494
requests for values below 256: Expert Review.
requests for more than one value: Expert Review.
requests for one value greater than 255: First Come First Served.
requests for one value, no value specified: First Come First Served.
Carlos Pignataro
RFC 826, RFC 5494
IETF Review or IESG Approval
RFC 826, RFC 5494, RFC 5342
The Ethertype space is administered as described in [RFC5342].
APEX Parameters
Application Access Protocol (ACAP) Numbers
RFC 2244
Specification Required
RFC 2244
First Come First Served
RFC 2244
Standards Action or IESG-Approved Experimental RFC
RFC 2244, RFC 6075
First Come First Served
Application Bridging for Federated Access Beyond Web (ABFAB) Parameters
RFC 7833
IETF Review or Expert Review
Application-Layer Traffic Optimization (ALTO) Protocol
Authenticated Encryption with Associated Data (AEAD) Parameters
RFC 5116
1-32767: Specification Required.
32768-65535: Private Use.
David McGrew Bjoern Tackmann Stanislav Smyshlyaev
Authentication and Authorization for Constrained Environments (ACE)
RFC 9200
less than -65536: Private Use.
-65536 to -257: Specification Required.
-256 to 255: Standards Action.
256 to 65535: Specification Required.
greater than 65535: Expert Review.
Göran Selander
RFC 9594
less than -65536: Private Use.
-65536 to -257: Specification Required.
-256 to 255: Standards Action With Expert Review.
256 to 65535: Specification Required.
greater than 65535: Expert Review.
Francesca Palombini Marco Tiloca Rikard Höglund
RFC 9594
less than -65536: Private Use.
-65536 to -257: Specification Required.
-256 to 255: Standards Action With Expert Review.
256 to 65535: Specification Required.
greater than 65535: Expert Review.
Strings of length 1: Standards Action With Expert Review.
Strings of length 2: Specification Required.
Strings of length greater than 2: Expert Review.
Francesca Palombini Marco Tiloca Rikard Höglund
RFC 9594
less than -65536: Private Use.
-65536 to -257: Specification Required.
-256 to 255: Standards Action With Expert Review.
256 to 65535: Specification Required.
greater than 65535: Expert Review.
Strings of length 1: Standards Action With Expert Review.
Strings of length 2: Specification Required.
Strings of length greater than 2: Expert Review.
Francesca Palombini Marco Tiloca Rikard Höglund
RFC 9594
less than -65536: Private Use.
-65536 to -257: Specification Required.
-256 to 255: Standards Action With Expert Review.
256 to 65535: Specification Required.
greater than 65535: Expert Review.
Strings of length 1: Standards Action With Expert Review.
Strings of length 2: Specification Required.
Strings of length greater than 2: Expert Review.
Francesca Palombini Marco Tiloca Rikard Höglund
RFC 9594
less than -65536: Private Use.
-65536 to -257: Specification Required.
-256 to 255: Standards Action With Expert Review.
256 to 65535: Specification Required.
greater than 65535: Expert Review.
Francesca Palombini Marco Tiloca Rikard Höglund
RFC 9594
less than -65536: Private Use.
-65536 to -257: Specification Required.
-256 to 255: Standards Action With Expert Review.
256 to 65535: Specification Required.
greater than 65535: Expert Review.
Francesca Palombini Marco Tiloca Rikard Höglund
RFC 9200
less than -65536: Private Use.
-65536 to -257: Specification Required.
-256 to 255: Standards Action.
256 to 65535: Specification Required.
greater than 65535: Expert Review.
Göran Selander
RFC 9770
less than -65536: Private Use.
-65536 to -257: Specification Required.
-256 to 255: Standards Action With Expert Review.
256 to 65535: Specification Required.
greater than 65535: Expert Review.
Marco Tiloca Marco Rasori
RFC 9770
less than -65536: Private Use.
-65536 to -257: Specification Required.
-256 to 255: Standards Action With Expert Review.
256 to 65535: Specification Required.
greater than 65535: Expert Review.
Marco Tiloca Marco Rasori
draft-ietf-ace-oscore-gm-admin-17
0-65535: Expert Review.
greater than 65535: Private Use.
draft-ietf-ace-key-groupcomm-oscore-21
0-65535: Expert Review.
greater than 65535: Private Use.
RFC 9200
less than -65536: Private Use.
-65536 or greater: Expert Review.
Göran Selander
RFC 9200
less than -65536: Private Use.
-65536 or greater: Expert Review.
Göran Selander
RFC 9200
less than -65536: Private Use.
-65536 or greater: Expert Review.
Göran Selander
RFC 9200
less than -65536: Private Use.
-65536 or greater: Expert Review.
Göran Selander
RFC 9200
less than -65536: Private Use.
-65536 or greater: Expert Review.
Göran Selander
RFC 9203
less than -65536: Private Use.
-65536 to -257: Specification Required.
-256 to 255: Standards Action With Expert Review.
256 to 65535: Specification Required.
greater than 65535: Expert Review.
Strings of length 1: Standards Action With Expert Review.
Strings of length 2: Specification Required.
Strings of length greater than 2: Expert Review.
Göran Selander
RFC 9594
less than -65536: Private Use.
-65536 to -257: Specification Required.
-256 to 255: Standards Action With Expert Review.
256 to 65535: Specification Required.
greater than 65535: Expert Review.
Strings of length 1: Standards Action With Expert Review.
Strings of length 2: Specification Required.
Strings of length greater than 2: Expert Review.
Francesca Palombini Marco Tiloca Rikard Höglund
Authentication and Key Agreement (AKA)
RFC 3310
Expert Review Vesa Torvinen (primary) Jari Arkko (secondary)
Authentication Method Reference Values
RFC 8176
Expert Review John Bradley Mike Jones
Authentication Option Name Spaces
Authentication, Authorization, and Accounting (AAA) Parameters
RFC 6733, RFC 6942
0-16777215: Specification Required.
16777216-4294967294: First Come First Served.
RFC 6733
block allocation (release of more than three AVPs at a time for a given purpose): IETF Review.
other allocation: Specification Required.
Lionel Morand (primary) Jouni Korhonen (secondary)
RFC 6733
Standards Action
RFC 6733
IETF Review (unless otherwise specified)
RFC 6733, RFC 5719
0-255: Reserved for RADIUS backward compatibility.
256-8388607: IETF Review.
8388608-16777213: First Come First Served with specification.
RFC 6733
Standards Action
RFC 5447
Specification Required Jouni Korhonen
RFC 5624
0-511: Standards Action.
512-32767: Specification Required.
32768-4294967295: Reserved.
Author Domain Signing Practices (ADSP) Parameters
Automated Certificate Management Environment (ACME) Protocol
RFC 8555
Specification Required Richard Barnes Aaron Gable
RFC 9447
Specification Required Mary Barnes Aaron Gable
RFC 8555
Specification Required Richard Barnes Aaron Gable
RFC 8739
Specification Required Yaron Sheffer Diego R. Lopez Thomas Fossati Aaron Gable
RFC 8555
Specification Required Richard Barnes Aaron Gable
RFC 8555
Specification Required Richard Barnes Aaron Gable
RFC 8555
Specification Required Richard Barnes Aaron Gable
RFC 8739
Specification Required Yaron Sheffer Diego R. Lopez Thomas Fossati Aaron Gable
RFC 8555
Specification Required Richard Barnes Aaron Gable
RFC 9773
Specification Required Richard Barnes Aaron Gable
RFC 8555
Specification Required Richard Barnes Aaron Gable
RFC 8555
Specification Required Richard Barnes Aaron Gable
RFC 9115
Specification Required Yaron Sheffer Diego R. Lopez Thomas Fossati Aaron Gable
Automatic Responses to Electronic Mail Parameters
Autonomic Control Plane (ACP)
RFC 8994
Standards Action
Autonomous System (AS) Numbers
RFC 1930, RFC 5398, RFC 6996, RFC 7249
RIR request to the IANA or IETF Review. Allocated following the Global Policy published at http://www.icann.org/en/resources/policy/global-addressing.
RFC 1930, RFC 5398, RFC 6793, RFC 6996, RFC 7249
RIR request to the IANA or IETF Review. Allocated following the Global Policy published at http://www.icann.org/en/resources/policy/global-addressing.
Babel Routing Protocol
RFC 8966
0-223: Specification Required.
224-254: Experimental Use.
Juliusz Chroboczek Donald Eastlake
RFC 8966
Specification Required Juliusz Chroboczek Donald Eastlake
RFC 8966
0-111: Specification Required.
112-126: Experimental Use.
128-239: Specification Required.
240-254: Experimental Use.
Juliusz Chroboczek Donald Eastlake
RFC 8966
0-223: Specification Required.
224-254: Experimental Use.
Juliusz Chroboczek Donald Eastlake
RFC 8966
Specification Required Juliusz Chroboczek Donald Eastlake
Battery Technologies
BGP Monitoring Protocol (BMP) Parameters
RFC 7854, RFC 9069, RFC 9515, RFC 9736
0-32767: Standards Action.
32768-65530: First Come First Served.
65531-65534: Experimental Use.
RFC 7854
0-127: Standards Action.
128-250: Specification Required.
251-254: Experimental Use.
John G. Scudder Rex Fernando (rex) Paolo Lucente
RFC 7854
0-127: Standards Action.
128-250: Specification Required.
251-254: Experimental Use.
John G. Scudder Rex Fernando (rex) Paolo Lucente
RFC 7854
0-127: Standards Action.
128-250: Specification Required.
251-254: Experimental Use.
John G. Scudder Rex Fernando (rex) Paolo Lucente
RFC 9736
0, 3-32767: Standards Action.
32768-65530: First Come First Served.
65531-65534: Experimental Use.
RFC 7854, RFC 9515
0-32767: Standards Action.
32768-65530: First Come First Served.
65531-65534: Experimental Use.
RFC 7854, RFC 9515
0-32767: Standards Action.
32768-65530: First Come First Served.
65531-65534: Experimental Use.
RFC 7854, RFC 9515
0-32767: Standards Action.
32768-65530: First Come First Served.
65531-65534: Experimental Use.
RFC 7854, RFC 9515
0-32767: Standards Action.
32768-65530: First Come First Served.
65531-65534: Experimental Use.
RFC 7854, RFC 9515
0-32767: Standards Action.
32768-65530: First Come First Served.
65531-65534: Experimental Use.
BGP Shortest Path First (BGP SPF)
Bidirectional Forwarding Detection (BFD) Parameters
RFC 5880
Expert Review Jeff Haas Les Ginsberg
RFC 5880
Expert Review Jeff Haas Les Ginsberg
Bit Index Explicit Replication (BIER)
RFC 8401, RFC 9272
0-127: Standards Action.
128-239: Specification Required.
240-254: Private or Experimental Use.
Les Ginsberg Chris Hopps
Blocks Extensible Exchange Protocol (BEEP) Parameters
RFC 3080
Expert Review Marshall T. Rose
RFC 3080
Expert Review Marshall T. Rose
Bootstrapping Remote Secure Key Infrastructures (BRSKI) Parameters
RFC 8995
Specification Required Michael Richardson Toerless Eckert
RFC 8995
Specification Required Michael Richardson
Border Gateway Protocol (BGP) Parameters
RFC 9026
0-175: IETF Review.
176-249: First Come First Served.
250-254: Experimental Use.
255: IETF Review.
RFC 9026
0-175: IETF Review.
176-249: First Come First Served.
250-254: Experimental Use.
255: IETF Review.
RFC 9793
First Come First Served
RFC 9871
Specification Required Bruno Decraene Swadesh Agrawal
RFC 9871
Specification Required Bruno Decraene Swadesh Agrawal
RFC 4271
Standards Action
RFC 6624
0-127: Expert Review.
128-251: First Come First Served.
252-255: Experimental Use.
RFC 6624
0-127: Expert Review.
128-251: First Come First Served.
252-255: Experimental Use.
RFC 4271
Standards Action
RFC 7153
0x40-0x7f: First Come First Served.
0xc0-0xcf: Reserved for Experimental Use.
0xd0-0xff: Standards Action.
RFC 5291
0-63: Standards Action.
64-127: First Come First Served.
128-255: Vendor-Specific.
RFC 4271
Standards Action
RFC 8669
Expert Review Acee Lindem Hannes Gredler
RFC 8669
Expert Review Acee Lindem Hannes Gredler
RFC 8669
Expert Review Acee Lindem Hannes Gredler
RFC 9234
IETF Review
RFC 7313
0-127: Standards Action.
128-254: First Come First Served.
RFC 7153, RFC 9184
0x00-0x3f: First Come First Served.
0x80-0x82: First Come First Served.
0x83-0x8f: Reserved for Experimental Use.
0x90-0xbf: Standards Action.
RFC 1997, RFC 8642
0x00000000-0x0000FFFF: Reserved.
0x00010000-0xFFFEFFFF: Private Use.
0xFFFF0000-0xFFFF8000: First Come First Served.
0xFFFF8001-0xFFFFFFFF: Standards Action.
RFC 5492, RFC 8810
1-63: IETF Review.
64-238: First Come First Served.
239-254: Experimental Use.
RFC 8584
RFC Required
RFC 8317
RFC Required
RFC 7153
0x00-0xbf: First Come First Served.
0xc0-0xff: IETF Review.
RFC 8955, RFC 9184
0x00-0xbf: First Come First Served.
0xc0-0xff: IETF Review.
RFC 8955, RFC 9184
0x00-0xbf: First Come First Served.
0xc0-0xff: IETF Review.
RFC 7153, RFC 9184
0x00-0xbf: First Come First Served.
0xc0-0xff: IETF Review.
draft-ietf-idr-nhc-07
0: Reserved.
1-65399: First Come First Served.
65400-65499: Private Use.
65500-65534: Experimental Use.
65535: Reserved.
First Come First Served
RFC 7153
0x00-0xbf: First Come First Served.
0xc0-0xff: IETF Review.
RFC 7153
0x00-0xbf: First Come First Served.
0xc0-0xff: IETF Review.
RFC 7153
0x00-0xbf: First Come First Served.
0xc0-0xff: IETF Review.
RFC 9832
0x00-0xbf: First Come First Served.
0xc0-0xff: IETF Review.
RFC 7153
0x00-0xbf: First Come First Served.
0xc0-0xff: IETF Review.
RFC 7385, RFC 8317
0x00-0x7A: IETF Review.
0x7B-0x7E: Experimental Use.
0x80-0xFA: Composite Tunnel.
0xFB-0xFE: Experimental Use.
0xFF: Standards Action.
RFC 9015
First Come First Served
RFC 9015
First Come First Served
RFC 9015
First Come First Served
RFC 9252
0-127: IETF Review.
128-254: First Come First Served.
255: IETF Review.
RFC 9252
0-127: IETF Review.
128-254: First Come First Served.
255: IETF Review.
RFC 7153
0x00-0xbf: First Come First Served.
0xc0-0xff: IETF Review.
RFC 7153
0x00-0xbf: First Come First Served.
0xc0-0xff: IETF Review.
RFC 7153
0x00-0xbf: First Come First Served.
0xc0-0xff: IETF Review.
RFC 9832
0x00-0xbf: First Come First Served.
0xc0-0xff: IETF Review.
RFC 7153
0x00-0xbf: First Come First Served.
0xc0-0xff: IETF Review.
Border Gateway Protocol (BGP) Tunnel Encapsulation
RFC 9012
1-63: Standards Action.
64-125: First Come First Served.
126-127: Experimental Use.
128-191: Standards Action.
192-252: First Come First Served.
253-254: Experimental Use.
Border Gateway Protocol - Link State (BGP-LS) Parameters
RFC 9552
Expert Review Adrian Farrel Hannes Gredler
RFC 9552
Expert Review Adrian Farrel Hannes Gredler
RFC 9552
0-255: Reserved (not to be allocated).
256-64999: Expert Review.
65000-65535: Private Use.
Hannes Gredler (primary) Adrian Farrel (secondary)
RFC 9552
1-64999: Expert Review.
65000-65535: Private Use.
Hannes Gredler (primary) Adrian Farrel (secondary)
RFC 9552
Expert Review Adrian Farrel Hannes Gredler
RFC 9552
1-199: Expert Review.
200-255: Private Use.
Hannes Gredler (primary) Adrian Farrel (secondary)
RFC 9857
Expert Review Stephane Litkowski Jie Dong
RFC 9857
Expert Review Matthew Bocci Zafar Ali
RFC 9514
Standards Action
BPF Instructions
RFC 9669
Permanent: Standards Action or IESG Approval.
Provisional: Specification Required.
Historical: Specification Required.
Alexei Starovoitov David Vernet
RFC 9669
Permanent: Standards Action or IESG Approval.
Provisional: Specification Required.
Historical: Specification Required.
Alexei Starovoitov David Vernet
Building Blocks
RFC 3048
Specification Required
Bundle Protocol
RFC 6255, RFC 9171
Specification Required Scott Burleigh Fred Templin
RFC 9173
Specification Required Ken McKeever Edward Birrane
RFC 9173
Specification Required Ken McKeever Edward Birrane
RFC 9172
Specification Required Ken McKeever Edward Birrane
RFC 7116, RFC 9713
Specification Required Marc Blanchet Keith Scott
RFC 6255, RFC 9171
Specification Required Scott Burleigh Fred Templin
RFC 6255
Specification Required Scott Burleigh Fred Templin
RFC 6258
Specification Required Rick Taylor
RFC 6255, RFC 9171
Specification Required Scott Burleigh Fred Templin
RFC 6255, RFC 9171
Specification Required Scott Burleigh Fred Templin
RFC 7116
0-63: Specification Required.
1024-65535: Specification Required.
Marc Blanchet Keith Scott
RFC 6257
Specification Required Stephen Farrell Edward Birrane
RFC 6257
Specification Required Stephen Farrell Edward Birrane
RFC 6257
Specification Required Stephen Farrell Edward Birrane
C-DNS DNS Capture Format
RFC 8618
Expert Review Jim Hague Sara Dickinson John Dickinson
RFC 8618
Expert Review Jim Hague Sara Dickinson John Dickinson
RFC 8618
Expert Review Jim Hague Sara Dickinson John Dickinson
RFC 8618
Expert Review Jim Hague Sara Dickinson John Dickinson
Caller-ID Numbering Plans
Candidate Access Router Discovery (CARD) Parameters
RFC 4065
Expert Review
RFC 4065
Specification Required and IESG Review
Captive Portals
RFC 8908
Specification Required Tommy Pauly Darshak Thakore Martin Thomson
CBOR Object Signing and Encryption (COSE)
RFC 9053, RFC 9054, RFC 9864
Integers less than -65536: Private Use.
Integer values from -65536 to -257: Specification Required.
Integer values between -256 and 255: Standards Action With Expert Review.
Integer values from 256 to 65535: Specification Required.
Integer values greater than 65535: Expert Review.
Strings of length 1: Standards Action With Expert Review.
Strings of length 2: Specification Required.
Strings of length greater than 2: Expert Review.
Göran Selander Derek Atkins Sean Turner
RFC 9053
Integers less than -65536: Private Use.
Integer values -65536 to -257: Specification Required.
Integer values -256 to 255: Standards Action With Expert Review.
Integer values 256 to 65535: Specification Required.
Integer values greater than 65535: Expert Review.
Göran Selander Derek Atkins Sean Turner
RFC 9053
Expert Review Göran Selander Derek Atkins Sean Turner
RFC 9052
Integers less than -65536: Private Use.
Integer values in the range -1 to -65536: delegated to the COSE Header Algorithm Parameters registry.
Integer values between 1 and 255: Standards Action With Expert Review.
Integer values from 256 to 65535: Specification Required.
Integer values greater than 65535: Expert Review.
Strings of length 1: Standards Action With Expert Review.
Strings of length 2: Specification Required.
Strings of length greater than 2: Expert Review.
Francesca Palombini Carsten Bormann
RFC 9052
Integers less than -65536: Private Use.
Integer values in the range -65536 to -1: used for key parameters specific to a single algorithm delegated to the COSE Key Type Parameters registry.
Integer values between 0 and 255: Standards Action With Expert Review.
Integer values from 256 to 65535: Specification Required.
Integer values greater than 65535: Expert Review.
Strings of length 1: Standards Action With Expert Review.
Strings of length 2: Specification Required.
Strings of length greater than 2: Expert Review.
Francesca Palombini Carsten Bormann
RFC 9053
Expert Review Göran Selander Derek Atkins Sean Turner
RFC 9053
Expert Review Göran Selander Derek Atkins Sean Turner
RFC 9942
Specification Required Mike Jones Orie Steele
RFC 9942
Specification Required Mike Jones Orie Steele
CBOR Web Token (CWT)
RFC 8392
Integer values from -256 to 255: Standards Action.
Integer values from -65536 to -257: Specification Required.
Integer values from 256 to 65535: Specification Required.
Integer values greater than 65535: Expert Review.
Strings of length 1: Standards Action.
Strings of length 2: Specification Required.
Strings of length greater than 2: Expert Review.
Mike Jones Hannes Tschofenig Ludwig Seitz
RFC 8747
Specification Required Ludwig Seitz Mike Jones
Centralized Conferencing Manipulation Protocol (CCMP) Parameters
RFC 6503
Specification Required
RFC 6503
Specification Required
CERT RR Certificate Types
RFC 4398
0x0000-0x00FF: Standards Action.
0xFF00-0xFFFF: Standards Action.
0x0100-0xFEFF: IETF Review.
Certificate Management Protocol (CMP)
RFC 9811
Specification Required Hendrik Brockhaus David von Oheimb John Gray
Channel-Binding Types
RFC 5056
Expert Review Nicolas Williams
Character Sets
RFC 2978
Expert Review Martin Dürst
RFC 2978
Expert Review Martin Dürst
Cisco Service Level Assurance Protocol
CoAP-EAP
RFC 9820
-65536..-25: Specification Required.
-24..-21: Private Use.
-20..23: Standards Action with Expert Review.
24..65535: Specification Required.
Marco Tiloca Alan DeKok
RFC 9820
0-23: Standards Action with Expert Review.
24-49: Private Use.
50-65000: Specification Required.
65001-65535: Experimental Use.
Marco Tiloca Alan DeKok
Common Architecture Label IPv6 Security Option (CALIPSO)
RFC 5570
1:0:0:0 - 254:255:255:255: Expert Review.
255:0:0:0 - 255:255:255:255: IESG Approval.
Common Name Resolution Protocol (CNRP) Parameters
RFC 3367
First Come First Served
RFC 3367
First Come First Served
RFC 3367
First Come First Served
Common Open Policy Service (COPS) Protocol
RFC 3182
0-127: IETF Review.
128-255: Private Use.
RFC 6401
0-127: IETF Review.
128-240: First Come First Served.
RFC 2748
Values are assigned relative to the respective Client-type
RFC 6401
0-127: IETF Review.
128-240: First Come First Served.
RFC 2750
0-49151: IETF Review.
49152-53247: First Come First Served.
53248-65535: Reserved for Private Use.
RFC 5946
0-127: IETF Review.
128-240: First Come First Served.
Common Presence and Instant Messaging (CPIM) Headers
RFC 3862
Standards Action
Concise Binary Object Representation (CBOR)
RFC 8949
0-19: Standards Action.
32-255: Specification Required.
Carsten Bormann
RFC 8949
0-23: Standards Action.
24-32767: Specification Required.
32768-18446744073709551615: First Come First Served.
Christian Amsüss Thomas Fossati Francesca Palombini Carsten Bormann (backup)
RFC 9581
Specification Required Henk Birkholz Esko Dijk
RFC 9581
RFC and Expert Review Required Henk Birkholz Esko Dijk
Concise Data Definition Language (CDDL)
RFC 8610
name includes internal dot: IETF Review.
name does not include internal dot: Specification Required.
Jeffrey Yasskin Henk Birkholz
Concise Software Identifier (CoSWID)
RFC 9393
0-32767: Standards Action with Expert Review.
32768-4294967295: Specification Required.
Charles Schmidt Jessica Fitzgerald-McKay Henk Birkholz
Connectivity Fault Management (CFM) OAM IETF Parameters
RFC 7319
Standards Action
RFC 7319
Standards Action
Constrained RESTful Environments (CoRE) Parameters
RFC 7252
Reserved ranges may be allocated in accordance with section 4.3 of RFC 8126.
RFC 7252, RFC 9876
0-255: Expert Review.
256-9999: IETF Review with Expert Review or IESG Approval with Expert Review.
10000-19999: Expert Review.
20000-32999: First Come First Served.
33000-64997: Expert Review.
64998-64999: Reserved for Documentation.
65000-65535: Experimental Use.
Esko Dijk (primary) Klaus Hartke (secondary) Carsten Bormann (secondary) Jaime Jimenez (secondary) Alexander Pelov (secondary)
RFC 7252
0-255: IETF Review or IESG Approval.
256-2047: Specification Required.
2048-64999: Expert Review.
65000-65535: Experimental use (no operational use).
Bilhanan Silverajan (primary) Klaus Hartke (secondary) Carsten Bormann (secondary) Jaime Jimenez (secondary) Alexander Pelov (secondary)
RFC 8323
IETF Review or IESG Approval
RFC 8323
0-255: IETF Review or IESG Approval.
256-2047: Specification Required.
2048-64999: Expert Review.
65000-65535: Experimental use (no operational use).
Bilhanan Silverajan (primary) Klaus Hartke (secondary) Alexander Pelov (secondary)
RFC 9290
Expert Review Thomas Fossati Carsten Bormann
RFC 9176
value starts with "core": IETF Review.
all other values: Specification Required.
Carsten Bormann Jaime Jiménez Christian Amsüss
RFC 6690
value starts with "core": IETF Review.
all other values: Specification Required.
Carsten Bormann Jaime Jimenez Christian Amsüss
RFC 8613
Expert Review Francesca Palombini Göran Selander Christian Amsüss
RFC 9176
Expert Review Carsten Bormann Jaime Jiménez Christian Amsüss
RFC 6690
value starts with "core": IETF Review.
all other values: Specification Required.
Carsten Bormann Jaime Jimenez Christian Amsüss
RFC 9290
Specification Required Thomas Fossati Carsten Bormann
RFC 9423
Expert Review Carsten Bormann Marco Tiloca
Content Delivery Network Interconnection (CDNI) Parameters
RFC 9808
Specification Required Ben Rosenblum Sanjay Mishra
RFC 8007
Specification Required Kevin Ma Sanjay Mishra
RFC 7937
Specification Required Kevin Ma
RFC 7937
Specification Required Kevin Ma
RFC 7937
Specification Required Kevin Ma
RFC 7937
Specification Required Kevin Ma
RFC 8006
Specification Required Kevin Ma
RFC 8006
Specification Required Kevin Ma
RFC 7736
Specification Required Kevin Ma Sanjay Mishra
RFC 7975
Specification Required Kevin Ma Sanjay Mishra
RFC 9808
Specification Required Ben Rosenblum Sanjay Mishra
RFC 9246
Specification Required Phil Sorber
RFC 9246
Specification Required Phil Sorber
Content Disposition Values and Parameters
RFC 2183
First Come First Served
RFC 2183
Standards Track or IESG-Approved Experimental RFC
Content Security Policy Directives
RFC 7762
Specification Required Mike West
Content-Centric Networking (CCNx)
RFC 9508
Specification Required Dave Oran Hitoshi Asaeda
RFC 8609
Specification Required Dave Oran Hitoshi Asaeda
RFC 8609
Specification Required Dave Oran Hitoshi Asaeda
RFC 8609
Specification Required Dave Oran Hitoshi Asaeda
RFC 8609
Specification Required Dave Oran Hitoshi Asaeda
RFC 9344
RFC Required
RFC 8609
Specification Required Dave Oran Hitoshi Asaeda
Context labels for Internet Messages
Context Transfer Protocol (CXTP) Parameters
Control And Provisioning of Wireless Access Points (CAPWAP) Parameters
RFC 5415
Standards Action
RFC 5415
Expert Review Margaret Cullen
RFC 5415
Standards Action
RFC 8350
Expert Review Sri Gundavelli Li Xue
RFC 8350
Specification Required Sri Gundavelli Li Xue
RFC 5415
Expert Review Margaret Cullen
RFC 5415
Expert Review Margaret Cullen
RFC 5416
Expert Review Margaret Cullen
RFC 5415
Expert Review Margaret Cullen
RFC 5415
Expert Review Margaret Cullen
RFC 5415
Expert Review Margaret Cullen
RFC 5415
Expert Review Margaret Cullen
RFC 5415
Expert Review Margaret Cullen
RFC 5415
Expert Review Margaret Cullen
RFC 5415
Expert Review Margaret Cullen
RFC 5415
Expert Review Margaret Cullen
RFC 5416
Expert Review Margaret Cullen
RFC 5416
Expert Review Margaret Cullen
RFC 5416
Expert Review Margaret Cullen
RFC 5416
Expert Review Margaret Cullen
RFC 5416
Expert Review Margaret Cullen
RFC 5416
Expert Review Margaret Cullen
RFC 5416
Expert Review Margaret Cullen
RFC 5416
Expert Review Margaret Cullen
RFC 5416
Expert Review Margaret Cullen
RFC 5416
Expert Review Margaret Cullen
RFC 5415
Expert Review Margaret Cullen
RFC 5415
Expert Review Margaret Cullen
RFC 5415
Expert Review Margaret Cullen
RFC 5415
Expert Review Margaret Cullen
RFC 5415
Expert Review Margaret Cullen
RFC 5415
Expert Review Margaret Cullen
RFC 5415
Expert Review Margaret Cullen
RFC 5415
Expert Review Margaret Cullen
RFC 5415
Expert Review Margaret Cullen
RFC 5415
Expert Review Margaret Cullen
RFC 5415
Expert Review Margaret Cullen
RFC 5415
Expert Review Margaret Cullen
ControLling mUltiple streams for tElepresence (CLUE)
RFC 8847
Specification Required Simon Pietro Romano
RFC 8847
Specification Required Simon Pietro Romano
RFC 8846
Expert Review Simon Pietro Romano
RFC 8846
Expert Review Simon Pietro Romano
RFC 8846
Expert Review Simon Pietro Romano
RFC 8846
Expert Review Simon Pietro Romano
Cryptographic Suites for IKEv1, IKEv2, and IPsec
RFC 4308
Expert Review and RFC Required Tero Kivinen
Cryptographically Generated Addresses (CGA) Message Type Name Space
RFC 3972, RFC 9374
First Come First Served
RFC 4982
Standards Action
Data Channel Establishment Protocol (DCEP) Parameters
RFC 8832
RFC Required
RFC 8832
RFC Required
Data Link Switching Client Access Protocol (DCAP) Parameters
Data Structure for the Security Suitability of Cryptographic Algorithms (DSSC)
RFC 5698
First Come First Served
Datagram Congestion Control Protocol (DCCP) Parameters
RFC 4340
Standards Action
RFC 4340
0-1: IETF Review (IETF RFC publication).
4-247: IETF Review (IETF RFC publication).
248-254: Reserved.
255: IETF Review (IETF RFC publication).
RFC 4340
Standards Action
RFC 4340
10-119: IETF Review (IETF RFC publication).
120-126: Reserved.
127: IETF Review (IETF RFC publication).
128-255: CCID-specific codes.
RFC 9897
RFC Required
RFC 4340
3-30: IETF Review (IETF RFC publication).
45-119: IETF Review (IETF RFC publication).
120-126: Reserved.
127: IETF Review (IETF RFC publication).
128-255: CCID-specific codes.
RFC 4340
Standards Action
RFC 4340
12-119: IETF Review (IETF RFC publication).
120-126: Reserved.
127: IETF Review (IETF RFC publication).
128-255: CCID-specific codes.
RFC 4340
Specification Required or First Come First Served Eddie Kohler
Datagram Transport Layer Security (DTLS) Extension to Establish Keys for Secure Real-time Transport Protocol (SRTP)
RFC 5764
Specification Required
Delivery Status Notification (DSN) Types
DetNet Associated Channel Header (d-ACH) Flags
Device Identification
RFC 9039
Specification Required or IESG Approval Jari Arkko Jaime Jimenez
Differentiated Services Field Codepoints (DSCP)
Directory System Names
Distributed Denial-of-Service Open Threat Signaling (DOTS) Signal Channel
RFC 9132
1-127: IETF Review.
128-255: IETF Review.
256-16383: IETF Review.
16384-32767: Specification Required.
32768-49151: IETF Review.
49152-65535: Private Use.
Nik Teague Mohamed Boucadair Andrew Mortensen Tirumaleswar Reddy
Distributed Node Consensus Protocol (DNCP)
RFC 7787
Standards Action
RFC 7788
RFC Required
DNS-Based Authentication of Named Entities (DANE) Parameters
RFC 6698, RFC 7218
Specification Required
RFC 6698, RFC 7218
Specification Required Viktor Dukhovni Shumon Huque Paul Wouters
Domain Name System (DNS) Parameters
RFC 8777
Specification Required
RFC 4701
Standards Action Ólafur Guðmundsson
RFC 9432
property prefix ends in the label "ext": Private Use.
all other property prefixes: Expert Review.
Peter Thomassen Ondřej Surý Willem Toorop
RFC 6895, RFC 9108
0: Standards Action.
1-127: IETF Review.
128-253: IETF Review.
256-32767: IETF Review.
32768-57343: Specification Required.
57344-65279: Specification Required.
65280-65534: Private Use.
65535: Standards Action.
Petr Špaček Ladislav Lhotka
RFC 6891
1-65000: Expert Review.
65001-65534: Local/Experimental Use.
Ólafur Guðmundsson (primary) Frederico AC Neves (secondary) Ray Bellis (secondary) Roy Arends (secondary)
RFC 6895, RFC 1035
Standards Action
RFC 6891
Standards Action
RFC 6895, RFC 1035
Standards Action
RFC 6895, RFC 1035
0-3840: IETF Review.
3841-4095: Private Use.
4096-65534: IETF Review.
65535: Reserved (Standards Action).
RFC 9606
Specification Required Tirumal Reddy Mohamed Boucadair Ben Schwartz
RFC 9018, RFC 7873
Version 1-239, Size 8-32: Expert Review.
Version 240-254, Size 8-32: Private Use.
Ondřej Surý Donald Eastlake
RFC 9460
0-65279: Expert Review.
65280-65534: Private Use.
Benjamin Schwartz David Lawrence
RFC 9250
provisional (greater than 0x3f): Expert Review.
provisional registration Date field update: First Come First Served.
permanent, 0x00-0x3f: Standards Action or IESG Approval.
permanent, greater than 0x3f: Specification Required.
Sara Dickinson Christian Huitema
RFC 3755, RFC 4034
Standards Action
RFC 8490
0x0004-0x003F: Standards Action.
0x0040-0xF7FF: Expert Review.
0xF800-0xFBFF: Experimental/Local Use.
0xFC00-0xFFFF: Standards Action.
Ted Lemon Sara Dickinson John Dickinson
RFC 9859
Expert Review Johan Stenstam Peter Thomassen John Levine
RFC 8914
0-49151: First Come First Served.
49152-65535: Private Use.
RFC 6895, RFC 1035, RFC 9108
0: RRTYPE zero is used as a special indicator for the SIG RR RFC 2931, RFC 4034 and in other circumstances and must never be allocated for ordinary use..
1-127: Expert Review (see mailing list information in RFC 6895) or Standards Action.
128-255: Expert Review (see mailing list information in RFC 6895) or Standards Action.
256-61439: Expert Review (see mailing list information in RFC 6895) or Standards Action.
61440-65279: Reserved for future use (IETF Review required to define use).
65280-65534: Private Use.
65535: Reserved (Standards Action).
Roy Arends Frederico AC Neves Ólafur Guðmundsson Ray Bellis
RFC 8552
Expert Review Frederico A C Neves Paul Wouters
RFC 8976
1-239: Specification Required.
240-254: Private Use.
Warren Kumari Duane Wessels Wes Hardaker
RFC 8976
1-239: Specification Required.
240-254: Private Use.
Warren Kumari Duane Wessels Wes Hardaker
RFC 9660
0-245: Specification Required.
246-254: Private Use.
255: Reserved.
Hugo Salgado Mauricio Vergara Ereche Duane Wessels
Domain Name System Security (DNSSEC) Algorithm Numbers
RFC 3658, RFC 4034, RFC 4035, RFC 9157, RFC 9904
Standards Action or Specification Required Mark Andrews Roy Arends Warren Kumari Wes Hardaker
RFC 2539
0x0000-0x07ff: Standards Action.
0x0800-0xbfff: RFC Required.
RFC 4034, RFC 3755, RFC 6014, RFC 6944, RFC 9904
Standards Action or Specification Required Mark Andrews Roy Arends Warren Kumari Wes Hardaker
Domain Name System Security (DNSSEC) NextSECure3 (NSEC3) Parameters
Domain-based Message Authentication, Reporting, and Conformance (DMARC)
RFC 9989
Specification Required Scott Kitterman
RFC 9989
Specification Required Scott Kitterman
DomainKeys Identified Mail (DKIM) Parameters
RFC 6376
IETF Review
RFC 6651
Specification Required
Drone Remote ID Protocol
RFC 9575
0x01-0x9F: Expert Review.
0xA0-0xEF: First Come First Served.
0xF0-0xFF: Experimental Use.
Adam Wiethuechter Mohamed Boucadair
RFC 9886
0-3: Reserved.
4-3999: IESG Approval.
4000-8191: Reserved.
8192-15359: First Come First Served.
15360-16383: Private Use.
RFC 9575
Standards Action
RFC 9886
First Come First Served
RFC 9374
Expert Review Adam Wiethuechter Mohamed Boucadair
Dynamic Host Configuration Protocol (DHCP) and Bootstrap Protocol (BOOTP) Parameters
RFC 6225
Standards Action
RFC 6225
Standards Action
RFC 9445
Expert Review Alan DeKok Mohamed Boucadair
Dynamic Host Configuration Protocol for IPv6 (DHCPv6)
RFC 9915
Standards Action
RFC 9915
Standards Action
RFC 9915
Expert Review and Standards Action Ted Lemon Bernie Volz Tomek Mrugalski
RFC 5970, RFC 9915
Expert Review Vincent Zimmer Bernie Volz Tomek Mrugalski
RFC 7037, RFC 9915
Expert Review Bernie Volz Tomek Mrugalski
RFC 9915
Standards Action
Dynamic Link Exchange Protocol (DLEP) Parameters
RFC 8175
26-65407: Specification Required.
65408-65534: Private Use.
Rick Taylor
RFC 8175
2-65519: Specification Required.
65520-65534: Private Use.
Rick Taylor
RFC 8629
4-65519: Specification Required.
65520-65534: Private Use.
Rick Taylor
RFC 8175
Specification Required Rick Taylor
RFC 8175
Specification Required Rick Taylor
RFC 8175
Specification Required Rick Taylor
RFC 8175
Specification Required Rick Taylor
RFC 8175
Specification Required Rick Taylor
RFC 8175
Specification Required Rick Taylor
RFC 8175
17-65519: Specification Required.
65520-65534: Private Use.
Rick Taylor
RFC 8175
Specification Required Rick Taylor
RFC 8651
2-65407: Specification Required.
65408-65534: Private Use.
Ronald in 't Velt Lou Berger
RFC 8175
3-65519: Specification Required.
65520-65534: Private Use.
Rick Taylor
RFC 8175
4-111: Specification Required.
112-127: Private Use.
133-239: Specification Required.
240-254: Private Use.
Rick Taylor
RFC 9892
1-65407: Specification Required.
65408-65534: Private Use.
Ronald in 't Velt Lou Berger
Dynamic Source Routing (DSR) Protocol Parameters
RFC 4728
Expert Review David B. Johnson David A. Maltz Yih-Chun Hu
RFC 4728
Expert Review David B. Johnson David A. Maltz Yih-Chun Hu
Dynamic Symmetric Key Provisioning Protocol (DSKPP)
RFC 6063
Standards Action
RFC 6063
Specification Required
RFC 6063
Specification Required
RFC 6063
Specification Required
EAP-pwd Parameters
RFC 5931
Specification Required Joseph Salowey
RFC 5931
IETF Review
RFC 5931
Specification Required Joseph Salowey
Electronic Commerce Modeling Language (ECML) Parameters
Electronic Commerce Modeling Language Version 2 (ECMLv2) Parameters
RFC 4112
Expert Approval Donald Eastlake
RFC 4112
Expert Approval Donald Eastlake
RFC 4112
Expert Approval Donald Eastlake
Email Authentication Parameters
RFC 8601, RFC 9989
Specification Required Murray Kucherawy (primary) Scott Kitterman (secondary)
RFC 8601
Expert Review Murray Kucherawy (primary) Scott Kitterman (secondary)
RFC 8601, RFC 9989
Specification Required Murray Kucherawy (primary) Scott Kitterman (secondary)
Emergency Call Additional Data
RFC 7852
Expert Review Brian Rosen
RFC 7852
Expert Review Brian Rosen
RFC 7852
Specification Required Brian Rosen
RFC 7852
Specification Required Brian Rosen (primary) Henning Schulzrinne (secondary)
RFC 7852
Expert Review Brian Rosen
RFC 7852
Expert Review Brian Rosen
RFC 7852
Expert Review Brian Rosen
RFC 7852
Expert Review Brian Rosen
RFC 7852
Expert Review Brian Rosen
Emergency Call Metadata/Control Data
RFC 8147
Expert Review Randall Gellens
RFC 8147
Expert Review Randall Gellens
RFC 8148
Specification Required Randall Gellens
RFC 8148
Expert Review Randall Gellens
RFC 8148
Expert Review Randall Gellens
Enumservice Registrations
RFC 6117
Specification Required Bernie Hoeneisen
Ephemeral Diffie-Hellman Over COSE (EDHOC)
RFC 9668
less than -65536: Private Use.
-65536 to -25: Specification Required.
-24 to 23: Standards Action with Expert Review.
24 to 65535: Specification Required.
greater than 65535: Private Use.
Francesca Palombini Marco Tiloca Göran Selander
RFC 9528
-65536 to -25: Specification Required.
-24 to -21: Private Use.
-20 to 23: Standards Action with Expert Review.
24 to 65535: Specification Required.
John Mattson Göran Selander Mališa Vučinić
RFC 9528
-65536 to -25: Expert Review.
-24 to 23: Standards Action.
24 to 65535: Expert Review.
John Mattson Göran Selander Mališa Vučinić
RFC 9528
0-23: Standards Action.
24-32767: Expert Review.
32768-65535: Private Use.
John Mattson Göran Selander Mališa Vučinić
RFC 9528
0-23: Standards Action with Expert Review.
24-65535: Specification Required.
John Mattson Göran Selander Mališa Vučinić
RFC 9528
-65536 to -25: Specification Required.
-24 to 23: Standards Action with Expert Review.
24 to 65535: Specification Required.
John Mattson Göran Selander Mališa Vučinić
ESP AGGFRAG_PAYLOAD
RFC 9347
Expert Review Christian Hopps
Ethernet VPN (EVPN)
RFC 7432
RFC Required
Extended Master Session Key (EMSK) Parameters
RFC 5295
0-220: IETF Review.
221-255: Reserved for Private Use.
Extensible Authentication Protocol (EAP)
RFC 4746
Expert Review Joseph Salowey
RFC 4187
Specification Required Vesa Lehtovirta
RFC 4187
Specification Required Vesa Lehtovirta
RFC 6630
Standards Action or IESG Approval
RFC 6630
Standards Action or IESG Approval
RFC 6630
Standards Action or IESG Approval
RFC 6677
Expert Review Joseph Salowey
RFC 9048
Specification Required Vesa Lehtovirta
RFC 9678
Specification Required Jari Arkko Peter Yee
RFC 4851
Specification Required Joseph Salowey
RFC 5421
Specification Required Joseph Salowey
RFC 5422
Specification Required Joseph Salowey
RFC 5422
Specification Required Joseph Salowey
RFC 5422
Specification Required Joseph Salowey
RFC 4851
Specification Required Joseph Salowey
RFC 5106
Expert Review Joseph Salowey
RFC 9140
Specification Required Tuomas Aura Mohit Sethi
RFC 9140
6001-6999: Private and Experimental Use.
All other values: Specification Required.
Tuomas Aura Mohit Sethi
RFC 9140
Specification Required Tuomas Aura Mohit Sethi
RFC 9140
Specification Required Tuomas Aura Mohit Sethi
RFC 9140
Specification Required Tuomas Aura Mohit Sethi
RFC 4763
IETF Review with Specification Required
RFC 4793
0x0003-0x7fff: Specification Required and IESG Approval.
0x8000-0xffff: Vendor-specific proprietary algorithms.
Joseph Salowey
RFC 4764
Specification Required Joseph Salowey
RFC 4793
0x0006-0x7fff: Specification Required and IESG Approval.
0x8000-0xffff: Proprietary vendor-specific algorithms.
Joseph Salowey
RFC 4793
0x0002-0x7fff: Specification Required and IESG Approval.
0x8000-0xffff: Vendor-specific proprietary algorithms.
Joseph Salowey
RFC 4746
Expert Review Joseph Salowey
RFC 6696
IETF Review
RFC 3748
1-191: Specification Required.
192-253: Standards Action.
254: Expanded Type.
255: Experimental.
256-4294967295: Specification Required.
Joseph Salowey
RFC 4763
IETF Review with Specification Required
RFC 3748
Standards Action
RFC 4746
Expert Review Joseph Salowey
RFC 4187
Specification Required Vesa Lehtovirta
RFC 9930
Specification Required Margaret Cullen Nancy Cam-Winget
RFC 9930
Specification Required
RFC 9930
Specification Required Margaret Cullen Nancy Cam-Winget
RFC 7458
Specification Required Jouni Korhonen
Extensible Authentication Protocol (EAP) Channel-Binding Parameters
Extensible Authentication Protocol (EAP) Encrypted Key Exchange (EKE) Registry
RFC 6124
Specification Required Joseph Salowey
RFC 6124
Specification Required Joseph Salowey
RFC 6124
Specification Required Joseph Salowey
RFC 6124
Specification Required Joseph Salowey
RFC 6124
Specification Required Joseph Salowey
RFC 6124
Specification Required Joseph Salowey
Extensible Binary Meta Language (EBML)
RFC 8794
First Come First Served
RFC 8794
0x80-0xFE: RFC Required.
0x407F-0x7FFE: Specification Required.
0x203FFF-0x3FFFFE: First Come First Served.
0x101FFFFF-0x1FFFFFFE: Specification Required or First Come First Served.
Dave Rice (primary) Steve Lhomme (backup) Moritz Bunkus (backup)
Extensible Markup Language (XML) Configuration Access Protocol (XCAP) Parameters
Extensible Provisioning Protocol (EPP) Extensions
RFC 7451
Specification Required Gavin Brown (primary) Alexander Mayrhofer (secondary) Ning Kong (secondary) Roger D Carney (secondary) Jim Galvin (secondary) James Gould (secondary) Scott Hollenbeck (secondary)
Extensible Provisioning Protocol (EPP) Organization Role Values
RFC 8543
Expert Review James Gould
Extensible Provisioning Protocol (EPP) Repository Identifiers
RFC 5730
First Come First Served
FCAST Parameters
RFC 6968
Specification Required
Federated File System (FedFS) Parameters
RFC 7532
First Come First Served
Fibre Channel Port Types Registry
RFC 4044
1-9999: Specification Required.
10000-99999: Private Use.
100000 and higher: Reserved.
Claudio DeSanti
Flow Spec Component Types
RFC 8955, RFC 8956
0: Reserved.
1-127: Specification Required.
128-254: Expert Review.
255: Reserved.
Susan Hares Robert Raszuk
FLUTE - File Delivery over Unidirectional Transport (FLUTE) Parameters
FOOBAR Address Family Numbers
Forwarding and Control Element Separation (ForCES)
RFC 5810
0x00000000-0x000000FF: IETF Review.
0x00000100-0x0000FFFF: Specification Required.
Jamal Hadi Salim Joel Halpern
RFC 5810
0x00000000-0x0000FFFF: IETF Review.
0x00010000-0x7FFFFFFF: Specification Required.
Jamal Hadi Salim Joel Halpern
RFC 6956
Specification Required Jamal Hadi Salim Joel Halpern
RFC 5810
IETF Review
RFC 5812, RFC 7121
0-65535: Standards Action.
>65535: First Come First Served with any publicly available specification.
RFC 5810
0x00-0x1F: IETF Review.
0x20-0x7F: Specification Required.
Jamal Hadi Salim Joel Halpern
RFC 6956
Specification Required Jamal Hadi Salim Joel Halpern
RFC 5810
0x0000-0x00FF: IETF Review.
0x0100-0x7FFF: Specification Required.
Jamal Hadi Salim Joel Halpern
RFC 5810
Expert Review Jamal Hadi Salim Joel Halpern
RFC 5810
0x0000-0x01FF: IETF Review.
0x0200-0x7FFF: Specification Required.
Jamal Hadi Salim Joel Halpern
RFC 6956
Specification Required Jamal Hadi Salim Joel Halpern
Free Lossless Audio Codec (FLAC)
FTP parameters
RFC 5797
registration marked "mandatory" ('m' in the "conf" column): Standards Action.
all other registrations: Specification Required.
John Klensin
General Internet Signalling Transport (GIST) Parameters
RFC 5971
First Come First Served
RFC 5971
First Come First Served
RFC 5971
First Come First Served
RFC 5971
First Come First Served
RFC 5971
First Come First Served
RFC 5971
First Come First Served
RFC 5971
0-63: IETF Review.
64-119: Expert Review.
Martin Stiemerling
RFC 5971
0-63: IETF Review.
64-119: Specification Required.
Martin Stiemerling
RFC 5971
0-31: IETF Review.
32-55: Expert Review.
Martin Stiemerling
RFC 5971
0-1023: IETF Review.
1024-1999: Specification Required.
Martin Stiemerling
Generalized Multi-Protocol Label Switching (GMPLS) Signaling Parameters
RFC 3471
IETF Review or Specification Required
RFC 4872
Standards Action
RFC 3471, RFC 4328
0-31743: Standards Action.
31744-32767: Assigned Temporarily for Experimental Usage.
32768-65535: Standards Action.
RFC 6205
Standards Action
RFC 6107
Standards Action
RFC 3471
IETF Review or Specification Required
RFC 3471, RFC 4328
0-239: Standards Action.
240-255: Assigned temporarily for Experimental Usage.
RFC 7139, RFC 7892
0-255: Standards Action.
0-255: Specification Required.
Daniele Ceccarelli Fatai Zhang
GeneRic Autonomic Signaling Protocol (GRASP) Parameters
RFC 8990
Specification Required Michael Richardson
Generic Routing Encapsulation (GRE) Parameters
RFC 2784
Need to go to IEEE
Generic Security Service Application Program Interface (GSSAPI)/Kerberos/Simple Authentication and Security Layer (SASL) Service Names
Generic Security Service Application Program Interface Parameters
RFC 7056
IETF Review or Expert Review
Geolocation Policy
Geopriv HTTP Enabled Location Delivery (HELD) Parameters
RFC 5985
Standards Action
Geopriv Identifiers
Geopriv Location Object Registries
RFC 4119
First Come First Served
RFC 5774
Expert Review Brian Rosen Dan Banks
RFC 4119
Expert Review Primary: Allison Mankin Secondary: Jon Peterson
Geopriv Location Type Registries
RFC 4776, RFC 6848
Type=A: IETF Review.
Type=B: Expert Review.
Martin Thomson
RFC 4589
Expert Review Martin Thomson
Global Navigation Satellite System (GNSS)
Global Switch Management Protocol version 3 (GSMPv3) Adaptation Type Name Space
RFC 3292
0x000-0x2FF: IETF Review.
0x300-0xFFF: First Come First Served.
Global Switch Management Protocol version 3 (GSMPv3) Event Flag Name Space
RFC 3292
Expert Review Stefaan De Cnodder Avri Doria
Global Switch Management Protocol version 3 (GSMPv3) Failure Response Message Name Space
RFC 3292
0-59: IETF Review.
60-79: Reserved for Vendor Private Extensions.
80-127: IETF Review.
128-159: Reserved for Vendor Private Extensions.
160-255: IETF Review.
Global Switch Management Protocol version 3 (GSMPv3) Label Type Name Space
RFC 3292
0x000-0xAFF: IETF Review.
0xB00-0xEFF: RFC Required.
0xF00-0xFFF: Reserved for vendor private use.
Global Switch Management Protocol version 3 (GSMPv3) Message Type Name Space
RFC 3292
0-99: IETF Review.
100-199: RFC Required.
200-249: Intended for Abstract and Resource Model Extension Messages.
250-255: Reserved for vendor private use.
Global Switch Management Protocol version 3 (GSMPv3) Model Type Name Space
RFC 3292
0: IETF Review.
1-200: RFC Required.
201-255: Reserved for vendor private use.
Global Switch Management Protocol version 3 (GSMPv3) Port Type Name Space
RFC 3292
0-127: IETF Review.
128-255: RFC Required or Specification Required.
Global Switch Management Protocol version 3 (GSMPv3) Result Type Name Space
RFC 3292
Expert Review Stefaan De Cnodder Avri Doria
Global Switch Management Protocol version 3 (GSMPv3) Service ID Name Space
RFC 3292
0-1023: IETF Review.
1024-65535: RFC Required.
Global Switch Management Protocol version 3 (GSMPv3) Traffic Control Name Space
RFC 3292
Expert Review Stefaan De Cnodder Avri Doria
Global Switched Telephone Network (GSTN) Address Element Extensions in Email Services
RFC 2846
Specification Required
RFC 2846, RFC 3191
Specification Required
RFC 2846, RFC 3191
Specification Required
GMPLS Routing Parameters for WSON
Grant Negotiation and Authorization Protocol (GNAP)
RFC 9635
Specification Required Justin Richer Joseph Salowey Sudesha Shetty
RFC 9635
Specification Required Justin Richer Joseph Salowey Sudesha Shetty
RFC 9635
Specification Required Justin Richer Joseph Salowey Sudesha Shetty
RFC 9635
Specification Required Justin Richer Joseph Salowey Sudesha Shetty
RFC 9635
Specification Required Justin Richer Joseph Salowey Sudesha Shetty
RFC 9635
Specification Required Justin Richer Joseph Salowey Sudesha Shetty
RFC 9635
Specification Required Justin Richer Joseph Salowey Sudesha Shetty
RFC 9635
Specification Required Justin Richer Joseph Salowey Sudesha Shetty
RFC 9635
Specification Required Justin Richer Joseph Salowey Sudesha Shetty
RFC 9635
Specification Required Justin Richer Joseph Salowey Sudesha Shetty
RFC 9635
Specification Required Justin Richer Joseph Salowey Sudesha Shetty
RFC 9635
Specification Required Justin Richer Joseph Salowey Sudesha Shetty
RFC 9635
Specification Required Justin Richer Joseph Salowey Sudesha Shetty
RFC 9635
Specification Required Justin Richer Joseph Salowey Sudesha Shetty
RFC 9767
Expert Review Justin Richer Joseph Salowey Sudesha Shetty
RFC 9767
Expert Review Justin Richer Joseph Salowey Sudesha Shetty
RFC 9767
Expert Review Justin Richer Joseph Salowey Sudesha Shetty
RFC 9767
Specification Required Justin Richer Joseph Salowey Sudesha Shetty
RFC 9635
Specification Required Justin Richer Joseph Salowey Sudesha Shetty
RFC 9635
Specification Required Justin Richer Joseph Salowey Sudesha Shetty
RFC 9767
Specification Required Justin Richer Joseph Salowey Sudesha Shetty
RFC 9767
Specification Required Justin Richer Joseph Salowey Sudesha Shetty
RFC 9767
Specification Required Justin Richer Joseph Salowey Sudesha Shetty
Group Domain of Interpretation (GDOI) Payloads
RFC 8263
Specification Required Brian Weis
RFC 8052
Expert Review Brian Weis Tero Kivinen
RFC 8052
Expert Review Brian Weis Tero Kivinen
RFC 8052
Expert Review Brian Weis Tero Kivinen
RFC 8052
Expert Review Brian Weis Tero Kivinen
Group Secure Association Group Management Protocol (GSAKMP) Parameters
RFC 4535
Standards Action
RFC 4535
Standards Action
RFC 4535
Standards Action
RFC 4535
Standards Action
Hash Algorithms for HTTP Digest Fields
RFC 9530
Specification Required Roberto Polli (primary) Lucas Pardue (secondary)
Hash Function Textual Names
Hash-Based Signatures
RFC 8554
0x00000005-0xDDDDDDDC: Specification Required.
0xDDDDDDDD-0xFFFFFFFF: Private Use.
David McGrew Scott Fluhrer
RFC 8554
0x00000001-0xDDDDDDDC: Specification Required.
0xDDDDDDDD-0xFFFFFFFF: Private Use.
David McGrew Scott Fluhrer
RFC 8391
Specification Required Andreas Huelsing Stefan-Lukas Gazdag
RFC 8391
Specification Required Andreas Huelsing Stefan-Lukas Gazdag
RFC 8391
Specification Required Andreas Huelsing Stefan-Lukas Gazdag
Host Identity Protocol (HIP) Parameters
RFC 7401
IETF Review
RFC 7401
IETF Review
RFC 7401
IETF Review
RFC 7401
IETF Review
RFC 6261
IETF Review or IESG Approval
RFC 7401
IETF Review
RFC 6028
IETF Review or IESG Approval
RFC 7401
IETF Review
RFC 7401
1-50: IETF Review.
51-8191: Specification Required.
8192-16383: Reserved for Private Use.
16384-40959: Specification Required.
40960-65535: Reserved for Private Use.
Robert Moskowitz Jeff Ahrenholz
RFC 7401
IETF Review
RFC 7401
0-1023: IETF Review.
1024-32767: Specification Required.
32768-49151: Reserved for Private Use.
49152-61439: Specification Required.
61440-65535: IETF Review.
Robert Moskowitz Jeff Ahrenholz
RFC 8003
0-200: IETF Review.
201-255: Reserved for Private Use.
RFC 8003
0-200: IETF Review.
201-255: Reserved for Private Use.
RFC 5201
Registry closed per RFC 7401
HTTP Message Signature
RFC 9421
Specification Required Justin Richer Manu Sporny
RFC 9421
Expert Review Justin Richer Manu Sporny
RFC 9421
Expert Review Justin Richer Manu Sporny
RFC 9421
Expert Review Justin Richer Manu Sporny
HTTP Origin-Bound Authentication (HOBA) Parameters
RFC 7486
Specification Required
RFC 7486
Specification Required
RFC 7486
Specification Required
Hybrid Public Key Encryption (HPKE)
RFC 9180
Specification Required Christopher Wood Richard Barnes
RFC 9180
Specification Required Christopher Wood Richard Barnes
RFC 9180
Specification Required Christopher Wood Richard Barnes
Hypertext Transfer Protocol (HTTP) Alt-Svc Parameter Registry
Hypertext Transfer Protocol (HTTP) Authentication Control Parameters
RFC 8053
Specification Required Rifaat Shekh-Yusef Yutaka Oiwa
RFC 8120
Expert Review Rifaat Shekh-Yusef Yutaka Oiwa
Hypertext Transfer Protocol (HTTP) Authentication Scheme Registry
RFC 8120
Expert Review Rifaat Shekh-Yusef Yutaka Oiwa
Hypertext Transfer Protocol (HTTP) Cache Directive Registry
Hypertext Transfer Protocol (HTTP) Cache-Status
RFC 9211
Expert Review Mark Nottingham
Hypertext Transfer Protocol (HTTP) Cookie Attributes
Hypertext Transfer Protocol (HTTP) Digest Algorithm Values
RFC 3230
RFC Required or Specification Required James Manger
Hypertext Transfer Protocol (HTTP) Field Name Registry
RFC 9110, RFC 9651
Specification Required for Permanent registrations, Expert Review for Provisional registrations. Mark Nottingham Roy Fielding
Hypertext Transfer Protocol (HTTP) Method Registry
Hypertext Transfer Protocol (HTTP) Parameters
RFC 7240
Specification Required Julian Reschke
Hypertext Transfer Protocol (HTTP) Priority
RFC 9218
Key length of one: Specification Required.
Key length greater than one: Expert Review.
Lucas Pardue Kazuho Oku
Hypertext Transfer Protocol (HTTP) Problem Types
RFC 9457
Specification Required Mark Nottingham Sanjay Dalal
Hypertext Transfer Protocol (HTTP) Proxy-Status
RFC 9209
Expert Review Mark Nottingham
RFC 9209
Expert Review Mark Nottingham
Hypertext Transfer Protocol (HTTP) Status Code Registry
Hypertext Transfer Protocol (HTTP) Upgrade Token Registry
RFC 9110
First Come First Served
Hypertext Transfer Protocol (HTTP) Warn Codes
Hypertext Transfer Protocol version 2 (HTTP/2) Parameters
RFC 9113
Expert Review Martin Thomson (primary) Julian Reschke (secondary)
RFC 9113
IETF Review or IESG Approval
RFC 9113
Expert Review Martin Thomson (primary) Julian Reschke (secondary)
Hypertext Transfer Protocol version 3 (HTTP/3)
RFC 9114
provisional: Expert Review.
provisional registration date field update: First Come First Served.
permanent, 0x00-0x3f: Standards Action or IESG Approval.
permanent, greater than 0x3f: Specification Required.
values 0x1f * N + 0x21 (for non-negative integer values of N): Reserved.
first unassigned codepoint: Standards Action.
Mike Bishop Alan Frindell
RFC 9114
provisional: Expert Review.
provisional registration date field update: First Come First Served.
permanent, 0x00-0x3f: Standards Action or IESG Approval.
permanent, greater than 0x3f: Specification Required.
values 0x1f * N + 0x21 (for non-negative integer values of N): Reserved.
first unassigned codepoint: Standards Action.
Mike Bishop Alan Frindell
RFC 9114
provisional: Expert Review.
provisional registration date field update: First Come First Served.
permanent, 0x00-0x3f: Standards Action or IESG Approval.
permanent, greater than 0x3f: Specification Required.
values 0x1f * N + 0x21 (for non-negative integer values of N): Reserved.
first unassigned codepoint: Standards Action.
Mike Bishop Alan Frindell
RFC 9114
provisional: Expert Review.
provisional registration date field update: First Come First Served.
permanent, 0x00-0x3f: Standards Action or IESG Approval.
permanent, greater than 0x3f: Specification Required.
values 0x1f * N + 0x21 (for non-negative integer values of N): Reserved.
first unassigned codepoint: Standards Action.
Mike Bishop Alan Frindell
IANA OUI Ethernet Numbers
RFC 9542
See RFC 9542. Donald Eastlake (primary) Juan Carlos Zuniga (secondary)
draft-ietf-ntp-over-ptp-08
0-0xFFFF: IETF Review.
0x10000-0x7FFFFF: Specification Required.
0x800000-0xFFFFFE: Experimental and Private Use.
RFC 9542
Expert Review Donald Eastlake (primary) Juan Carlos Zuniga (secondary)
IANA-Maintained MIBs
RFC 3808
See Character Sets
RFC 7461
Specification Required
RFC 6933
Expert Review Andy Bierman (primary) Jürgen Schönwälder (secondary)
RFC 3806
Expert Review Ira McDonald Michael Sweet
RFC 4802
See individual GMPLS registry procedures
RFC 4148, RFC 6248
This module has been designated Obsolete. The registry will no longer be updated, and the current contents will be maintained as-is.
RFC 3165
Expert Review Juergen Schoenwaelder David Levi
RFC 3559
RFC or designated expert review Dave Thaler
RFC 4836
Expert Review Marek Hajduczenia Operations and Management Area Directors (backup)
RFC 3805
Expert Review or RFC Required Ira McDonald Michael Sweet
RFC 2932
RFC or Expert Review Dave Thaler
RFC 7367
IANAsmfOpModeIdTC: First Come First Served. IANAsmfRssaIdTC: 1-127, Standards Action; 128-239, Reserved for Private or Local Use; 240-255, Experimental RFC.
RFC 2863, RFC 8892
This is one of the available formats of the Interface Types (ifType) and Tunnel Types (tunnelType) registries. Dave Thaler
RFC 2561
Working Group Review (see DESCRIPTION clause associated with the MODULE-IDENTITY statement)
iCalendar Element Registries
RFC 5545
Expert Review with RFC Required Bernard Desruisseaux Ken Murchison Mike Douglass
RFC 5545
Expert Review with RFC Required Bernard Desruisseaux Ken Murchison Mike Douglass
RFC 5545
Expert Review with RFC Required Bernard Desruisseaux Ken Murchison Mike Douglass
RFC 5545
Expert Review with RFC Required Bernard Desruisseaux Ken Murchison Mike Douglass
RFC 7986
Expert Review with RFC Required
RFC 7986
Expert Review with RFC Required
RFC 5545
Expert Review with RFC Required Bernard Desruisseaux Ken Murchison Mike Douglass
RFC 5545
Expert Review with RFC Required Bernard Desruisseaux Ken Murchison Mike Douglass
RFC 5545
Expert Review with RFC Required Bernard Desruisseaux Ken Murchison Mike Douglass
RFC 9073
Expert Review Ken Murchison Michael Douglass
RFC 5545
Expert Review with RFC Required Bernard Desruisseaux Ken Murchison Mike Douglass
RFC 5545
Expert Review with RFC Required Bernard Desruisseaux Ken Murchison Mike Douglass
RFC 5545
Expert Review with RFC Required Bernard Desruisseaux Ken Murchison Mike Douglass
RFC 9074
Expert Review with RFC Required Ken Murchison Michael Douglass
RFC 5545
Expert Review with RFC Required Bernard Desruisseaux Ken Murchison Mike Douglass
RFC 5546
Expert Review with RFC Required Bernard Desruisseaux Ken Murchison Mike Douglass
RFC 9073
Expert Review Ken Murchison Michael Douglass
RFC 6638
Expert Review with RFC Required
RFC 6638
Expert Review with RFC Required
draft-ietf-calext-ical-tasks-17
Standards Action With Expert Review
draft-ietf-calext-ical-tasks-17
Standards Action With Expert Review
draft-ietf-calext-ical-tasks-17
Standards Action With Expert Review
RFC 5545
Expert Review with RFC Required Bernard Desruisseaux Ken Murchison Mike Douglass
IDNA Rules and Derived Property Values
RFC 5892, RFC 6452, RFC 8753, RFC 9233
Expert Review Patrik Faltstrom (team lead) Takahiro Nemoto Peter Saint-Andre
IEEE 802 Numbers
RFC 9542
Not assigned by IANA. Per RFC 9542, updates to this registry are coordinated with the expert. Donald Eastlake (primary) Juan Carlos Zuniga (secondary)

Not assigned by IANA. Per RFC 9542, updates to this registry are coordinated with the expert. Donald Eastlake (primary) Juan Carlos Zuniga (secondary)

Not assigned by IANA. Per RFC 9542, updates to this registry are coordinated with the expert. Donald Eastlake (primary) Juan Carlos Zuniga (secondary)
IEEE Std 802.15.4 IETF IE Subtype IDs
RFC 8137
Expert Review Tero Kivinen Pat Kinney
IETF XML Registry
RFC 3688
IETF-controlled space: IETF Review With Expert Review.
Non-IETF space: Specification Required.
Tim Bray Martin Thomson
RFC 3688
IETF-controlled space: IETF Review With Expert Review.
Non-IETF space: Specification Required.
Tim Bray Martin Thomson
RFC 3688
IETF-controlled space: IETF Review With Expert Review.
Non-IETF space: Specification Required.
Tim Bray Martin Thomson
RFC 3688, RFC 6685
IETF-controlled space: IETF Review With Expert Review.
Non-IETF space: Specification Required.
Tim Bray and Martin Thomson for non-IODEF schemas Kathleen Moriarty for IODEF schemas
In Situ OAM (IOAM)
RFC 9326
IETF Review
RFC 9197
IETF Review
RFC 9197
0x0000: Expert Review.
0x0001-0x7FFF: Private Use.
0x8000-0xFFFF: Expert Review.
RFC 9197
IETF Review
RFC 9197
IETF Review
In Situ OAM (IOAM) Capabilities
Incident Object Description Exchange Format (IODEF)
Incident Object Description Exchange Format v2 (IODEF)
RFC 7970
Expert Review Roman Danyliw Takeshi Takahashi
RFC 7970
Expert Review Roman Danyliw Takeshi Takahashi
RFC 7970
Expert Review Roman Danyliw Takeshi Takahashi
RFC 7970
Expert Review Roman Danyliw Takeshi Takahashi
RFC 7970
Expert Review Roman Danyliw Takeshi Takahashi
RFC 7970
Expert Review Roman Danyliw Takeshi Takahashi
RFC 7970
Expert Review Roman Danyliw Takeshi Takahashi
RFC 7970
Expert Review Roman Danyliw Takeshi Takahashi
RFC 7970
Expert Review Roman Danyliw Takeshi Takahashi
RFC 7970
Expert Review Roman Danyliw Takeshi Takahashi
RFC 7970
Expert Review Roman Danyliw Takeshi Takahashi
RFC 7970
Expert Review Roman Danyliw Takeshi Takahashi
RFC 7970
Expert Review Roman Danyliw Takeshi Takahashi
RFC 7970
Expert Review Roman Danyliw Takeshi Takahashi
RFC 7970
Expert Review Roman Danyliw Takeshi Takahashi
RFC 7970
Expert Review Roman Danyliw Takeshi Takahashi
RFC 7970
Expert Review Roman Danyliw Takeshi Takahashi
RFC 7970
Expert Review Roman Danyliw Takeshi Takahashi
RFC 7970
Expert Review Roman Danyliw Takeshi Takahashi
RFC 7970
Expert Review Roman Danyliw Takeshi Takahashi
RFC 7970
Expert Review Roman Danyliw Takeshi Takahashi
RFC 7970
Expert Review Roman Danyliw Takeshi Takahashi
RFC 7970
Expert Review Roman Danyliw Takeshi Takahashi
RFC 7970
Expert Review Roman Danyliw Takeshi Takahashi
RFC 7970
Expert Review Roman Danyliw Takeshi Takahashi
RFC 7970
Expert Review Roman Danyliw Takeshi Takahashi
RFC 7970
Expert Review Roman Danyliw Takeshi Takahashi
RFC 7970
Expert Review Roman Danyliw Takeshi Takahashi
RFC 7970
Expert Review Roman Danyliw Takeshi Takahashi
RFC 7970
Expert Review Roman Danyliw Takeshi Takahashi
RFC 7970
Expert Review Roman Danyliw Takeshi Takahashi
RFC 7970
Expert Review Roman Danyliw Takeshi Takahashi
RFC 7970
Expert Review Roman Danyliw Takeshi Takahashi
RFC 7970
Expert Review Roman Danyliw Takeshi Takahashi
Instance Manipulation Values
RFC 3229
Specification Required
Instant Message Disposition Notification (IMDN) Headers
RFC 5438
Specification Required
Instant Messaging SRV Protocol Label Registry
Integrated Services Parameters
RFC 2216
1-127: Parameters defined in RFC 2215.
128-254: Parameters defined by author of service specification document (Service and Data Element Naming).
RFC 2216
2-127: RFC Required.
128-254: Experimental use.
Inter-Asterisk eXchange (IAX) Parameters
RFC 5457
Expert Review Cullen Jennings
RFC 5457
Expert Review Cullen Jennings
RFC 5457
Expert Review Cullen Jennings
RFC 5457
Expert Review Cullen Jennings
RFC 5457
Expert Review Cullen Jennings
RFC 5457
Expert Review Cullen Jennings
RFC 5457
Expert Review Cullen Jennings
RFC 5457
Expert Review Cullen Jennings
RFC 5457
Expert Review Cullen Jennings
RFC 5457
Expert Review Cullen Jennings
RFC 5457
Expert Review Cullen Jennings
RFC 5457
Expert Review Cullen Jennings
RFC 5457
Expert Review Cullen Jennings
RFC 5457
Expert Review Cullen Jennings
Interactive Connectivity Establishment (ICE)
RFC 8839
Specification Required Ari Keränen
RFC 6544
IETF Review or IESG Approval
Interface Parameters
RFC 1213, RFC 8892
Specification Required Dave Thaler
RFC 4087, RFC 8675, RFC 8892
Expert Review Dave Thaler
Interior Gateway Protocol (IGP) Parameters
RFC 8665
Standards Action
RFC 9917
Expert Review Peter Psenak Shraddha Hegde
RFC 9350, RFC 9843
0-127: Standards Action.
128-255: User-Defined Metric.
RFC 8491, RFC 9702
Expert Review Uma Chunduri Jeff Tantsura
RFC 9479
Expert Review Les Ginsberg Chris Hopps
Internet - Xerox Network System (XNS) Protocol Mappings
Internet Control Message Protocol (ICMP) Parameters
RFC 4884
0-246: First Come First Served.
247-255: Private Use.
RFC 2780, RFC 9899
IESG Approval or Standards Action
Internet Control Message Protocol version 6 (ICMPv6) Parameters
RFC 7400
IETF Review or IESG Approval
RFC 8505
IETF Review or IESG Approval
RFC 8505
IETF Review or IESG Approval
RFC 8928
Specification Required or IESG Approval Mohit Sethi
RFC 9685
IETF Review or IESG Approval
RFC 4443, RFC 9899
0-127 (Error messages): IETF Review.
128-255 (Informational messages): IETF Review.
RFC 5175
Standards Action or IESG Approval
RFC 9685
Standards Action
RFC 8801
Standards Action
RFC 4620
IETF Review
Internet Date/Time Format
RFC 9557
Permanent: Specification Required.
Provisional: Expert Review.
Ujjwal Sharma Bron Gondwana
Internet Group Management Protocol (IGMP) Type Numbers
RFC 9778
Standards Action
RFC 9778
Standards Action
RFC 9279
0-65533: IETF Review.
65534-65535: Experimental Use.
Internet Key Exchange (IKE) Attributes
RFC 2408, RFC 9395
Registry closed
RFC 2409, RFC 9395
Registry closed
Internet Key Exchange Version 2 (IKEv2) Parameters
RFC 9838
Expert Review Tero Kivinen Valery Smyslov
RFC 9838
Expert Review Tero Kivinen Valery Smyslov
RFC 9838
Expert Review Tero Kivinen Valery Smyslov
RFC 7296
Expert Review Tero Kivinen Valery Smyslov
RFC 7296
Expert Review Tero Kivinen Valery Smyslov
RFC 7296
Expert Review Tero Kivinen Valery Smyslov
RFC 7296
Expert Review Tero Kivinen Valery Smyslov
RFC 7296
Expert Review Tero Kivinen Valery Smyslov
RFC 5685
Expert Review Tero Kivinen Valery Smyslov
RFC 7427
Expert Review Tero Kivinen Valery Smyslov
RFC 7296
Expert Review Tero Kivinen Valery Smyslov
RFC 7296
Expert Review Tero Kivinen Valery Smyslov
RFC 7296
0-8191: Expert Review.
8192-16383: Private Use.
Tero Kivinen Valery Smyslov
RFC 7296
16384-40959: Expert Review.
40960-65535: Private Use.
Tero Kivinen Valery Smyslov
RFC 7296
Expert Review Tero Kivinen Valery Smyslov
RFC 8784
1-127: Expert Review.
128-255: Private Use.
Tero Kivinen Valery Smyslov
RFC 6467
Expert Review Tero Kivinen Valery Smyslov
RFC 7296
Expert Review Tero Kivinen Valery Smyslov
RFC 7296
Expert Review Tero Kivinen Valery Smyslov
RFC 9838
Expert Review Tero Kivinen Valery Smyslov
RFC 5857
Expert Review Tero Kivinen Valery Smyslov
RFC 7296, RFC 9370
Expert Review Tero Kivinen Valery Smyslov
Internet Message Access Protocol (IMAP) Capabilities
RFC 5788, RFC 8621
Expert Review Arnt Gulbrandsen Barry Leiba
RFC 5257
Standards Track or IESG-Approved Experimental RFC
RFC 5257
Under vendor namespace: First Come First Served.
Not under vendor namespace: Standards Track or IESG-Approved Experimental RFC.
RFC 3501, RFC 8457, RFC 9051
IETF Review or Expert Review Barry Leiba Bron Gondwana
RFC 5464
Standards Track or IESG-Approved Experimental RFC
RFC 5464
Standards Track or IESG-Approved Experimental RFC
RFC 9208
Specification Required Alexey Melnikov Ken Murchison
RFC 5530
Expert Review Arnt Gulbrandsen Dave Cridland
RFC 5256
Standards Track or IESG-Approved Experimental RFC
RFC 4467
Standards Track or IESG-Approved Experimental RFC
RFC 5258
FCFS; IANA approval template in RFC 5258 section 9.3
RFC 5258
IANA approval template in RFC 5258 section 9.3
Internet Message Store Events
RFC 5423
name starts wth "vnd."; intended for private use: First Come First Served.
name doesn't start with "vnd."; intended for interoperable use: IETF Review.
RFC 5423
name starts wth "vnd."; intended for private use: First Come First Served.
name doesn't start with "vnd."; intended for interoperable use: IETF Review.
Internet Open Trading Protocol (IOTP) Codes
RFC 2801
Expert Review David Burdett
RFC 2801
RFC Required David Burdett
RFC 2801
First Come First Served David Burdett
RFC 2801
First Come First Served David Burdett
RFC 2801
Expert Review David Burdett
RFC 2801
Expert Review David Burdett
RFC 2801
Expert Review David Burdett
RFC 2801
Expert Review David Burdett
RFC 2801
RFC Required David Burdett
RFC 2801
RFC Required David Burdett
RFC 2801
RFC Required David Burdett
Internet Printing Protocol (IPP) Registrations
RFC 8011
Specification Required Ira McDonald Michael Sweet
RFC 8011
Specification Required Ira McDonald Michael Sweet
RFC 8011
Expert Review Ira McDonald Michael Sweet
RFC 8011
type1: Specification Required.
type2: Expert Review.
Ira McDonald Michael Sweet
RFC 8011
type1: Specification Required.
type2: Expert Review.
Ira McDonald Michael Sweet
RFC 8011
Specification Required Ira McDonald Michael Sweet
RFC 8011
Expert Review Ira McDonald Michael Sweet
RFC 8011
Specification Required Ira McDonald Michael Sweet
RFC 8011
Expert Review Ira McDonald Michael Sweet
Internet Protocol version 4 (IPv4) Address Space

Global Policy for Post Exhaustion IPv4 Allocation Mechanisms by the IANA (Ratified 6 May 2012)

Global Policy for Post Exhaustion IPv4 Allocation Mechanisms by the IANA (Ratified 6 May 2012)
RFC 7249
Allocations to RIRs are made in line with the Global Policy published at http://www.icann.org/en/resources/policy/global-addressing. All other assignments require IETF Review.
Internet Protocol Version 4 (IPv4) Parameters

Not defined

Registrations no longer accepted

Registrations no longer accepted
Internet Protocol version 6 (IPv6) Global Unicast Allocations
RFC 7249
Allocations to RIRs are made in line with the Global Policy published at http://www.icann.org/en/resources/policy/global-addressing. All other assignments require IETF Review.
Internet Protocol Version 6 (IPv6) Parameters
RFC 8200, RFC 2780, RFC 9673
IESG Approval, IETF Review or Standards Action
RFC 2780, RFC 5237, RFC 7045, RFC 9899
Standards Action or IESG Approval
RFC 8200, RFC 5871
IETF Review or IESG Approval
RFC 6553
IETF Review
RFC 6621
IETF Review
Internet Small Computer System Interface (iSCSI) Parameters
RFC 7143
IETF Review
RFC 7143
Standards Action to define the semantics of the opcode; Expert Review to select the specific opcode(s)
RFC 7144
Expert Review and Standards Action
RFC 7145
Standards Action
RFC 3723
Specification Required
Internet Storage Name Service (iSNS) Parameters
RFC 4171
Expert Review (by IPS WG Chairperson or by Designated Expert) David Black
Intrusion Detection Exchange Protocol (IDXP) Options
RFC 4767
Expert Review Ben Feinstein
Intrusion Detection Message Exchange Format (IDMEF) Parameters
RFC 4765
Specification Required
IP Flow Information Export (IPFIX) Entities
RFC 5610
Expert Review IE Doctors (Andrew Feren Brian Trammell Nevil Brownlee Paul Aitken)
RFC 7012, RFC 9710
Expert Review IE Doctors (Andrew Feren Brian Trammell Nevil Brownlee Paul Aitken)
RFC 9740
Expert Review Paul Aitken Jen Linkova
RFC 7011
Standards Action
RFC 7011
Standards Action
IP Multicast Traceroute Facility (Mtrace)
RFC 8487
Specification Required
RFC 8487
Specification Required
IP Version Numbers
RFC 2780
Standards Action
IPS Protocol# (Protocol Number) Field
RFC 3643
1-239: Standards Action.
240-255: Private Use.
IPSECKEY Resource Record Parameters
RFC 4025
Standards Action
IPv4 Multicast Address Space
RFC 5771
Expert Review, IESG Approval, or Standards Action Stig Venaas
RFC 5771
Expert Review, IESG Approval, or Standards Action Stig Venaas
RFC 5771
Expert Review, IESG Approval, or Standards Action Stig Venaas
RFC 3180
Stig Venaas
RFC 5771
Expert Review, IESG Approval, or Standards Action Stig Venaas
RFC 5771
Expert Review, IESG Approval, or Standards Action Stig Venaas
IPv6 Address Space
IPv6 Anycast Address Space
IPv6 Low Power Personal Area Network Parameters
RFC 4944, RFC 8025
Specification Required Carles Gomez Shwetha Bhandari
RFC 8066
Specification Required Shwetha Bhandari
RFC 4944
Specification Required Carles Gomez
IPv6 Multicast Address Space
RFC 3307, draft-ietf-pim-updt-ipv6-dyn-mcast-addr-grp-id-13
0x90000000-0xEFFFFFFF: Standards Action.
0xFD000000-0xFDFFFFFF: Private Use.
0xFE000000-0xFEFFFFFF: Experimental Use.
Stig Venaas
RFC 7346
IETF Review Stig Venaas
RFC 3307
Addresses in FF3X:0::/32 but not listed below are reserved for future SSM address use, but are currently invalid. FF3X:0:0:0:0:0:0:0-FF3X:0:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF (FF3X:0::/32) FF3X:0:0:0:0:0:4000:0-FF3X:0:0:0:0:0:7FFF:FFFF - Expert Review; see registry at https://www.iana.org/assignments/perm-mcast-groupids FF3X:0:0:0:0:0:8000:0-FF3X:0:0:0:0:0:FFFF:FFFF - Uses dynamic assignment according to the protocols listed in the https://www.iana.org/assignments/ipv6-multicast-addresses/ipv6-multicast-addresses.xhtml#dynamic-multicast-group-idsDynamic Multicast Group IDs registry Stig Venaas
RFC 3307
Expert Review Stig Venaas
IPv6 Over the TSCH Mode of IEEE 802.15.4 (6TiSCH)
RFC 8480
IETF Review or IESG Approval
RFC 8480
IETF Review or IESG Approval
RFC 8480
IETF Review or IESG Approval
RFC 8480
IETF Review or IESG Approval
RFC 8480
0-127: IETF Review or IESG Approval.
128-255: Expert Review.
Xavi Vilajosana Guillen Thomas Watteyne
RFC 8480
IETF Review or IESG Approval
RFC 9031
Integer values less than -65536: Private Use.
Integer values from -65536 to -257: Specification Required.
Integer values from -256 to 255: Standards Action.
Integer values from 256 to 65535: Specification Required.
Integer values greater than 65535: Expert Review.
Mališa Vučinić Michael Richardson
RFC 9031
Integer values less than -65536: Private Use.
Integer values from -65536 to -257: Specification Required.
Integer values from -256 to 255: Standards Action.
Integer values from 256 to 65535: Specification Required.
Integer values greater than 65535: Expert Review.
Mališa Vučinić Michael Richardson
RFC 9031
Integer values less than -65536: Private Use.
Integer values from -65536 to -257: Specification Required.
Integer values from -256 to 255: Standards Action.
Integer values from 256 to 65535: Specification Required.
Integer values greater than 65535: Expert Review.
Mališa Vučinić Michael Richardson
IPv6 Router Alert Option Values
IPv6 Top Level Aggregation Identifier Assignments
RFC 4147
Registrations no longer accepted
RFC 4147
Registrations no longer accepted
IS-IS
RFC 6823
Expert Review Chris Hopps Hannes Gredler Les Ginsberg
RFC 5304
Expert Review Chris Hopps Hannes Gredler Les Ginsberg
RFC 9681
Expert Review Chris Hopps Hannes Gredler Les Ginsberg
RFC 7794
Expert Review Chris Hopps Hannes Gredler Les Ginsberg
RFC 7176
Expert Review Chris Hopps Hannes Gredler Les Ginsberg
RFC 5120
0-3995: Expert Review.
3996-4095: Private Use.
Chris Hopps Hannes Gredler Les Ginsberg
RFC 5029, RFC 9667, RFC 9650
Expert Review Chris Hopps Hannes Gredler Les Ginsberg
RFC 9352
Expert Review Chris Hopps Hannes Gredler Les Ginsberg
RFC 9352
Expert Review Chris Hopps Hannes Gredler Les Ginsberg
RFC 9352
Expert Review Chris Hopps Hannes Gredler Les Ginsberg
RFC 9352
Expert Review Chris Hopps Hannes Gredler Les Ginsberg
RFC 9479, RFC 9885
Expert Review Chris Hopps Hannes Gredler Les Ginsberg
RFC 8401, RFC 9885
Expert Review Chris Hopps Hannes Gredler Les Ginsberg
RFC 9350, RFC 9885
Expert Review Chris Hopps Hannes Gredler Les Ginsberg
RFC 9377, RFC 9885
Expert Review Chris Hopps Hannes Gredler Les Ginsberg
RFC 9352, RFC 9885
Expert Review Chris Hopps Hannes Gredler Les Ginsberg
RFC 9352, RFC 9885
Expert Review Chris Hopps Hannes Gredler Les Ginsberg
RFC 9479, RFC 9885
Expert Review Chris Hopps Hannes Gredler Les Ginsberg
RFC 9681
Expert Review Chris Hopps Hannes Gredler Les Ginsberg
RFC 7981, RFC 9885
Expert Review Chris Hopps Hannes Gredler Les Ginsberg
RFC 6329, RFC 9885
Expert Review Chris Hopps Hannes Gredler Les Ginsberg
RFC 7176
Expert Review Chris Hopps Hannes Gredler Les Ginsberg
RFC 8500, RFC 9885
Expert Review Chris Hopps Hannes Gredler Les Ginsberg
RFC 8667, RFC 9885
Expert Review Chris Hopps Hannes Gredler Les Ginsberg
RFC 9666
Expert Review with RFC Required Chris Hopps Hannes Gredler Les Ginsberg
RFC 5305, RFC 5316, RFC 7370, RFC 8668, RFC 9885
Expert Review Chris Hopps Hannes Gredler Les Ginsberg
RFC 5305, RFC 7370, RFC 9352, RFC 9885
Expert Review Chris Hopps Hannes Gredler Les Ginsberg
RFC 3563, RFC 6233, RFC 7356, RFC 8918, RFC 9885
Expert Review Chris Hopps Hannes Gredler Les Ginsberg
RFC 7356
Expert Review Chris Hopps Hannes Gredler Les Ginsberg
Java Message Service (JMS) URI Scheme Variants
RFC 6167
First Come First Served
JSCalendar
RFC 8984
Expert Review Robert Stepanek Neil Jenkins Michael Douglass
RFC 8984, draft-ietf-jmap-calendars-22
Expert Review Robert Stepanek Neil Jenkins Michael Douglass
RFC 8984
Expert Review Robert Stepanek Neil Jenkins Michael Douglass
JSContact
RFC 9553
Major version change required: Standards Action.
All other assignments: Specification Required.
Michael Douglass Mario Loffredo Robert Stepanek
draft-ietf-calext-jscontact-profiles-14
Reference updates: Expert Review.
New assignments: Specification Required.
RFC 9553
Major version change required: Standards Action.
All other assignments: Specification Required.
Michael Douglass Mario Loffredo Robert Stepanek
RFC 9553
Major version change required: Standards Action.
All other assignments: Specification Required.
Michael Douglass Mario Loffredo Robert Stepanek
RFC 9553
Major version change required: Standards Action.
All other assignments: Specification Required.
Michael Douglass Mario Loffredo Robert Stepanek
JSON Meta Application Protocol (JMAP)
RFC 8620
intended use field is “common" or “placeholder”: Specification Required.
all other values: Expert Review.
Neil Jenkins Chris Newman Arnt Gulbrandsen Joris Baum
RFC 9404
Specification Required Ken Murchison Neil Jenkins Arnt Gulbrandsen Joris Baum
RFC 8620
Expert Review Neil Jenkins Chris Newman Arnt Gulbrandsen Joris Baum
JSON Object Signing and Encryption (JOSE)
RFC 7518
Specification Required Sean Turner Mike Jones Filip Skokan
RFC 7518, RFC 7638
Specification Required Sean Turner Mike Jones Filip Skokan
RFC 7517
Specification Required Sean Turner Mike Jones Filip Skokan
RFC 7517, RFC 7638
Specification Required Sean Turner Mike Jones Filip Skokan
RFC 7517
Specification Required Sean Turner Mike Jones Filip Skokan
RFC 7518, RFC 7638
Specification Required Sean Turner Mike Jones Filip Skokan
RFC 7517
Specification Required Sean Turner Mike Jones Filip Skokan
RFC 7518, RFC 9864
Specification Required Sean Turner Mike Jones Filip Skokan
RFC 7515
Specification Required Sean Turner Mike Jones Filip Skokan
JSON Web Token (JWT)
RFC 7519
Specification Required Brian Campbell Mike Jones Nat Sakimura Filip Skokan
RFC 7800
Specification Required John Bradley Hannes Tschofenig
RFC 9795
Specification Required Chris Wendt Jon Peterson
RFC 8443
Specification Required Martin Dolly Subir Das
RFC 8225
Specification Required Chris Wendt (primary) Russ Housley (secondary)
JSONPath
RFC 9535
Expert Review Glyn Normington
Kerberized Internet Negotiation of Keys (KINK) Parameters
RFC 4430
0-8191: Standards Action or non standards-track RFCs with Expert Review.
8192-16383: Private Use.
16384-4294967295: Reserved.
Stewart Bryant Danny McPherson
RFC 4430
1-127: Standards Action or non standards-track RFCs with Expert Review.
128-255: Private Use.
Shoichi Sakane Ken'ichi Kamada
RFC 4430
0-127: Standards Action or non standards-track RFCs with Expert Review.
128-255: Private Use.
Shoichi Sakane Ken'ichi Kamada
Kerberos Parameters
RFC 6113
Standards Action
RFC 6113
Standards Action
RFC 3961
Standards Action for standards-track RFCs; non-standards-track RFCs must be reviewed by an expert. Ken Raeburn
RFC 3961
Standards Action for standards-track RFCs; non-standards-track RFCs must be reviewed by an expert. Ken Raeburn
RFC 9588
Specification Required Simo Sorce Greg Hudson
RFC 9588
Specification Required Simo Sorce Greg Hudson
RFC 5021
0-29: Standards Action or IESG Approval.
30: Reserved.
RFC 6113
Expert Review Sam Hartman (primary) Larry Zhu (secondary)
RFC 6111
Specification Required
Kerberos V GSS-API Mechanism Parameters
RFC 6542
0x00000000 - 0x000003FF: IETF Review.
0x00000400 - 0xFFFFF3FF: Specification Required.
Keying and Authentication for Routing Protocols (KARP) Parameters
KeyNote Parameters
RFC 2704
First Come First Served
KeyTable
RFC 7210
First Come First Served
RFC 7210
First Come First Served
RFC 7210
Specification Required
Label Distribution Protocol (LDP) Parameters
RFC 5036
0x00000000-0xefffffff: First Come First Served.
0xf0000000-0xffffffff: Experiment Ids - Reserved for Private Use.
RFC 5036, RFC 7358
0-127: IETF Review.
128-191: First Come First Served.
RFC 6388
0-32767: Standards Action.
32768-65535: First Come First Served.
RFC 8223
0x0001-0x1FFF: IETF Review.
0x2000-0xF7FF: First Come First Served.
RFC 7361
Standards Action
RFC 5036
0x0001-0x00FF: IETF Review.
0x0100-0x01FF: IETF Review.
0x0200-0x02FF: IETF Review.
0x0300-0x03FF: IETF Review.
0x0400-0x04FF: IETF Review.
0x0500-0x05FF: IETF Review.
0x0600-0x3DFF: IETF Review.
0x3E00-0x3EFF: LDP Vendor-Private Extensions.
0x3F00-0x3FFF: LDP Experimental Extensions.
RFC 5036
0x00000000-0x1FFFFFFF: IETF Review.
0x20000000-0x3EFFFFFF: First Come First Served.
0x3F000000-0x3FFFFFFF: Private Use.
RFC 5036
0x0001-0x07FF: IETF Review.
0x0800-0x08FF (CR-LDP): IETF Review.
0x0900-0x3DFF: IETF Review.
0x3E00-0x3EFF: LDP Vendor-Private Extensions.
0x3F00-0x3FFF: LDP Experimental Extensions.
Label Generation Ruleset (LGR) Dispositions
RFC 7940
First Come First Served
RFC 7940
Specification Required
Language Tags
RFC 5646
See the Language Subtag Registry.
RFC 5645, RFC 5646
Expert Review Doug Ewell
RFC 5646
IETF Review or IESG Approval
Layer Two Tunneling Protocol "L2TP"
RFC 4454
Expert Review Carlos Pignataro (primary) Ignacio Goyret (secondary)
RFC 3438
Expert Review Carlos Pignataro (primary) Ignacio Goyret (secondary)
RFC 3931
Expert Review Carlos Pignataro (primary) Ignacio Goyret (secondary)
RFC 3931
Expert Review Carlos Pignataro (primary) Ignacio Goyret (secondary)
RFC 3931
0-32767: Expert Review.
32768-65535: First Come First Served.
Carlos Pignataro (primary) Ignacio Goyret (secondary)
RFC 3438
Expert Review Carlos Pignataro (primary) Ignacio Goyret (secondary)
RFC 3438
Expert Review Carlos Pignataro (primary) Ignacio Goyret (secondary)
RFC 3301
Specification Required Carlos Pignataro (primary) Ignacio Goyret (secondary)
Layered Coding Transport (LCT) Header Extension Types
RFC 5651
0-63: IETF Review.
64-127: Specification Required.
128-191: IETF Review.
192-255: Specification Required.
Vincent Roca
Level of Assurance (LoA) Profiles
RFC 6711
Expert Review John Bradley Joni Brennan Leif Johansson
Licklider Transmission Protocol (LTP) Parameters
RFC 7116
Specification Required
RFC 5327
Specification Required
RFC 7116
Specification Required
RFC 7116
1-16383: Expert Review.
268435456-4398046511103: First Come First Served for requests of up to 16384 values. Larger requests require Expert Review..
RFC 5326
Specification Required
Lightweight Directory Access Protocol (LDAP) - pcimSchema Descriptors
Lightweight Directory Access Protocol (LDAP) Parameters
RFC 4520
x- Private Use (can not be registered) e- Reserved for Experiments, First Come First Served All others: Standards Action or Expert Review with Specification Rolf Sonneveld Andrew Findlay
RFC 4520
0-1023 Standards Action (can not start with e- or x-) 1024-4095 Expert Review with Specification Required (can not start with e- or x-) 4096-16383 First Come First Served (Shall start with e-) 16384 and higher Private Use (Shall start with x-) Rolf Sonneveld Andrew Findlay
RFC 4520
x- Private Use e- Reserved for Experiments, First Come First Served All others, Standards Action or Expert Review with Specification Required Rolf Sonneveld Andrew Findlay
RFC 4520
Standards Action
RFC 4520
0-1023 Standards Action (can not start with e- or x-) 1024-4095 Expert Review with Specification Required (can not start with e- or x-) 4096-16383 First Come First Served (Shall start with e-) 16384 and higher Private Use (Shall start with x-) Rolf Sonneveld Andrew Findlay
RFC 4520
0-1023 Standards Action (can not start with e- or x-) 1024-4095 Expert Review with Specification Required (can not start with e- or x-) 4096-16383 First Come First Served (Shall start with e-) 16384 and higher Private Use (Shall start with x-) Rolf Sonneveld Andrew Findlay
RFC 4520
First Come First Served
RFC 4520
Standards Action
RFC 4520
x- Private Use (can not be registered) e- Reserved for Experiments, First Come First Served All others: Expert Review Rolf Sonneveld Andrew Findlay
RFC 4520
First Come First Served
RFC 4520
0-1023 Standards Action (can not start with e- or x-) 1024-4095 Expert Review with Specification Required (can not start with e- or x-) 4096-16383 First Come First Served (Shall start with e-) 16384 and higher Private Use (Shall start with x-) Rolf Sonneveld Andrew Findlay
Link Management Protocol (LMP) Parameters
RFC 4204
0-127: Standards Action.
128-247: Expert Review.
Dimitri Papadimitriou
RFC 4204
0-127: Standards Action.
128-247: Expert Review.
Dimitri Papadimitriou
Link Relations
RFC 8288
Specification Required Mark Nottingham Julian Reschke Jan Algermissen
Link State Routing TE Capabilities
Locally-Served DNS Zones
RFC 9665
Standards Action or IESG Approval
Location-to-Service Translation (LoST) Location Profiles
RFC 5222, RFC 9036
Specification Required Henning Schulzrinne
Locator/ID Separation Protocol (LISP) Parameters
RFC 9301
IETF Review or IESG Approval
RFC 9301
First Come First Served
RFC 8060
Specification Required Luigi Iannone Albert Cabellos
RFC 9301
Specification Required Albert Cabellos Dino Farinacci
RFC 9301
Specification Required Albert Cabellos Dino Farinacci
RFC 9301
Specification Required Albert Cabellos Dino Farinacci
RFC 9301
Specification Required Albert Cabellos Dino Farinacci
RFC 9301
Specification Required Albert Cabellos Dino Farinacci
RFC 9437
Specification Required Albert Cabellos Dino Farinacci
RFC 9301
Specification Required Albert Cabellos Dino Farinacci
RFC 8061
First Come First Served
RFC 9303
Specification Required Damien Saucez Luigi Iannone
RFC 9303
Specification Required Damien Saucez Luigi Iannone
RFC 9304, RFC 9301
Standards Action
RFC 9304
0-1023: Standards Action.
1024-4095: First Come First Served.
RFC 9305
Specification Required Darrel Lewis Luigi Iannone
RFC 9303
Specification Required Damien Saucez Luigi Iannone
RFC 9303
Specification Required Damien Saucez Luigi Iannone
RFC 9303
Specification Required Damien Saucez Luigi Iannone
Machine Names

Not defined
"Magic Numbers" for ISAKMP Protocol
Mail Parameters
RFC 1505
Specification Required
RFC 9788
Specification Required or IETF Review (see Note)
RFC 821, RFC 822, RFC 5321
Standards Action or IESG-Approved Experimental RFC
RFC 8494
Specification Required Alexey Melnikov (primary) RFC Independent Submissions Editor (secondary)
RFC 6729
First Come First Served
RFC 9422
Specification Required John Klensin Murray Kucherawy (backup)
RFC 5321
Standards Action or IESG-Approved Experimental RFC
Manufacturer Usage Description (MUD)
RFC 8520
Standards Action
RFC 8520
Expert Review Eliot Lear Dan Romascanu
Matroska
RFC 9559
First Come First Served
RFC 9559
First Come First Served
RFC 9559
Specification Required Dave Rice Steve Lhomme
RFC 9559
Specification Required Dave Rice Steve Lhomme
RFC 9559
Specification Required Dave Rice Steve Lhomme
RFC 9559
Specification Required Dave Rice Steve Lhomme
RFC 9559
Specification Required Dave Rice Steve Lhomme
RFC 9559
Specification Required Dave Rice Steve Lhomme
RFC 9559
0x80-0xFE: RFC Required.
0x407F-0x7FFE: Specification Required.
0x203FFF-0x3FFFFE: First Come First Served.
0x101FFFFF-0x1FFFFFFE: First Come First Served.
Dave Rice Steve Lhomme
RFC 9559
First Come First Served
RFC 9559
First Come First Served
RFC 9559
Specification Required Dave Rice Steve Lhomme
draft-ietf-cellar-tags-25
Tag Names for UTF-8 data: First Come First Served.
Tag Names for binary data: Specification Required.
Tag Names for nested tags: Specification Required.
RFC 9559
Specification Required Dave Rice Steve Lhomme
RFC 9559
First Come First Served
RFC 9559
Specification Required Dave Rice Steve Lhomme
RFC 9559
First Come First Served
Maximally Redundant Tree (MRT) Parameters
Media Control Channel Framework Parameters
RFC 6230
RFC Required
RFC 6230
RFC Required
RFC 6230
RFC Required
RFC 6230
RFC Required
Media Feature Tags - iso.org.dod.internet.features (1.3.6.1.8)
Media Gateway Control Protocol (MGCP)
RFC 3660
Expert Review Brian Rosen
RFC 3435
Expert Review Brian Rosen
RFC 3435
Expert Review Brian Rosen
Media Independent Handover (MIH)
Media Resource Control Protocol Version 2 (MRCPv2) Parameters
RFC 6787
Standards Action
RFC 6787
Standards Action
RFC 6787
Specification Required
Megaco/H.248 Packages
RFC 5125, RFC 5615
Expert Review
RFC 5125
Expert Review or IETF Review
Message Disposition Notification (MDN) Parameters
RFC 8098
Specification Required Tony Hansen
RFC 8098
Specification Required
Message Headers
RFC 8255
Specification Required Nik Tomkinson
RFC 3864, draft-ietf-emailcore-rfc5322bis-12
Expert Review Mark Baker (primary) Murray Kucherawy (backup)
RFC 3864, draft-ietf-emailcore-rfc5322bis-12
Expert Review Mark Baker (primary) Murray Kucherawy (backup)
Message Session Relay Protocol (MSRP) Parameters
RFC 4975
RFC Required
RFC 4975
RFC Required
RFC 4975
RFC Required
Message Tracking Query Protocol (MTQP) Options Registry
RFC 3887
Options whose names do not begin with "vnd.": Standards Action or IESG-approved experimental RFC.
Options with "vnd.": First Come First Served.
Messaging Abuse Reporting Format (MARF) Parameters
RFC 5965
Specification Required Scott Kitterman Murray Kucherawy
RFC 5965
Specification Required Scott Kitterman Murray Kucherawy
Messaging Layer Security (MLS)
RFC 9420
Specification Required Sean Turner Raphael Robert Richard Barnes
RFC 9420
Specification Required Sean Turner Raphael Robert Richard Barnes
RFC 9420
Specification Required Sean Turner Raphael Robert Richard Barnes
RFC 9420
Specification Required Sean Turner Raphael Robert Richard Barnes
RFC 9420
Specification Required Sean Turner Raphael Robert Richard Barnes
RFC 9420
Specification Required Sean Turner Raphael Robert Richard Barnes
RFC 9420
Specification Required Sean Turner Raphael Robert Richard Barnes
RFC 9420
Specification Required Sean Turner Raphael Robert Richard Barnes
Milnet Parameters

Registry closed

Registry closed
Mobile Ad hoc NETwork (MANET) Parameters
RFC 5444, RFC 7631, RFC 8245
0-127: Expert Review.
128-223: Expert Review.
224-255: Reserved for Experimental Use.
Justin Dean Christoper Dearlove (backup)
RFC 7182
Expert Review Justin Dean Christoper Dearlove (backup)
RFC 7182
Expert Review Justin Dean Christoper Dearlove (backup)
RFC 6130
0-127: Reserved.
128-223: Expert Review.
224-255: Reserved.
Justin Dean Christoper Dearlove (backup)
RFC 6130
0-127: Reserved.
128-223: Expert Review.
224-255: Reserved.
Justin Dean Christoper Dearlove (backup)
RFC 7182
Expert Review Justin Dean Christoper Dearlove (backup)
RFC 7182
Expert Review Justin Dean Christoper Dearlove (backup)
RFC 7182
Expert Review Justin Dean Christoper Dearlove (backup)
RFC 7181
Expert Review Justin Dean Christoper Dearlove (backup)
RFC 7188
Expert Review Justin Dean Christoper Dearlove (backup)
RFC 7188
Expert Review Justin Dean Christoper Dearlove (backup)
RFC 5444, RFC 7631, RFC 8245
0-127: Expert Review.
128-223: Expert Review.
224-255: Reserved for Experimental Use.
Justin Dean Christoper Dearlove (backup)
RFC 5444, RFC 8245
Expert Review Justin Dean Christoper Dearlove (backup)
RFC 7188
Expert Review Justin Dean Christoper Dearlove (backup)
RFC 7188
Expert Review Justin Dean Christoper Dearlove (backup)
RFC 7188
Expert Review Justin Dean Christoper Dearlove (backup)
RFC 5444, RFC 8245
Expert Review Justin Dean Christoper Dearlove (backup)
RFC 6621
Expert Review Justin Dean Christoper Dearlove (backup)
RFC 6621
Expert Review Justin Dean Christoper Dearlove (backup)
RFC 6621
Expert Review Justin Dean Christoper Dearlove (backup)
RFC 7181
0-127: Reserved.
128-223: Expert Review.
224-255: Reserved.
Justin Dean Christoper Dearlove (backup)
RFC 7181
0-127: Reserved.
128-223: Expert Review.
224-255: Reserved.
Justin Dean Christoper Dearlove (backup)
RFC 7182
Expert Review Justin Dean Christoper Dearlove (backup)
RFC 7182
Expert Review Justin Dean Christoper Dearlove (backup)
RFC 7182
Expert Review Justin Dean Christoper Dearlove (backup)
RFC 5497, RFC 7631
Expert Review Justin Dean Christoper Dearlove (backup)
RFC 5497, RFC 7631
Expert Review Justin Dean Christoper Dearlove (backup)
RFC 5497, RFC 7631
Expert Review Justin Dean Christoper Dearlove (backup)
RFC 5497, RFC 7631
Expert Review Justin Dean Christoper Dearlove (backup)
RFC 7181, RFC 7631
Expert Review Justin Dean Christoper Dearlove (backup)
RFC 6130, RFC 7631
Expert Review Justin Dean Christoper Dearlove (backup)
RFC 6130, RFC 7631
Expert Review Justin Dean Christoper Dearlove (backup)
RFC 6130, RFC 7631
Expert Review Justin Dean Christoper Dearlove (backup)
RFC 7181, RFC 7631
Expert Review Justin Dean Christoper Dearlove (backup)
RFC 7181, RFC 7631
Expert Review Justin Dean Christoper Dearlove (backup)
RFC 7181, RFC 7631
Expert Review Justin Dean Christoper Dearlove (backup)
RFC 7181, RFC 7631
Expert Review Justin Dean Christoper Dearlove (backup)
Mobile IPv4 Numbers
RFC 6098
0: Expert Review.
1-63: Expert Review.
64-69: Expert Review.
70-127: Expert Review.
128-133: Expert Review.
134-191: Expert Review.
192-197: Expert Review.
198-255: Expert Review.
RFC 5944
Specification Required
RFC 5177
Standards Action or IESG Approval
RFC 4721
Must be specified and approved by the MIP4 working group
Mobile IPv6
RFC 6757
Expert Review Jouni Korhonen Sri Gundavelli
RFC 5213
Expert Review Sri Gundavelli Jouni Korhonen
RFC 5213
Standards Action or IESG Approval
RFC 5846
Standards Action or IESG Approval
RFC 5846
Standards Action or IESG Approval
RFC 5213
Standards Action or IESG Approval
RFC 6089
Standards Action or IESG Approval
RFC 5213
Expert Review Sri Gundavelli Jouni Korhonen
RFC 5949
Standards Action or IESG Approval
RFC 5949
Standards Action or IESG Approval
RFC 5949
Standards Action or IESG Approval
RFC 5949
Standards Action or IESG Approval
RFC 5844
Expert Review Sri Gundavelli Jouni Korhonen
RFC 5844
Expert Review Sri Gundavelli Jouni Korhonen
RFC 8127
Expert Review Dhananjay Patki Lyle Bertz
RFC 6275
Standards Action or IESG Approval
RFC 7222
Specification Required Jouni Korhonen Sri Gundavelli
RFC 5846
Standards Action or IESG Approval
RFC 6275, RFC 5213
Standards Action or IESG Approval
RFC 5026
Standards Action or IESG Approval
RFC 6089
Standards Action or IESG Approval
RFC 7077
Specification Required Sri Gundavelli Marco Liebsch
RFC 7077
Specification Required Sri Gundavelli Marco Liebsch
Multi-threaded Routing Toolkit (MRT)
RFC 6396
New Subtype Code definitions must reference an existing Type Code to which the Subtype belongs. Subtype assignments follow the assignment rules for the Type Codes to which they belong.
RFC 6396
65-511: IETF Review.
512-2047: Specification Required.
2048-64511: First Come First Served.
Multicast Acquisition
Multicast Address Dynamic Client Allocation Protocol (MADCAP) Parameters
RFC 2730
IETF Review
Multicast Address-Set Claim (MASC) Parameters
Multicast Ping Protocol Parameters
Multicast Source Discovery Protocol (MSDP) TLV Values Registry
RFC 3618
1-200: Standards Action or IESG Approval.
201-255: Experimental Use.
Multimedia Internet KEYing (MIKEY) Payload Name Spaces
RFC 3830, RFC 6309
IETF Review or IESG Approval
RFC 3830, RFC 6309
IETF Review or IESG Approval
RFC 3830, RFC 6309
IETF Review or IESG Approval
RFC 6267
Specification Required Daniel Migault
RFC 3830, RFC 6309
IETF Review or IESG Approval
RFC 3830, RFC 6309
IETF Review or IESG Approval
RFC 6043
Specification Required Daniel Migault
RFC 6509
Specification Required Daniel Migault
RFC 3830, RFC 6309
IETF Review or IESG Approval
RFC 3830, RFC 6309
IETF Review or IESG Approval
RFC 6043
Specification Required Daniel Migault
RFC 6509
Specification Required Daniel Migault
RFC 3830, RFC 6309
IETF Review or IESG Approval
RFC 3830, RFC 6309
IETF Review or IESG Approval
RFC 6267
Specification Required Daniel Migault
RFC 6043
Specification Required Daniel Migault
RFC 3830, RFC 6309
IETF Review or IESG Approval
RFC 6043
Specification Required Daniel Migault
Multiplexed Application Substrate over QUIC Encryption (MASQUE)
RFC 9297
provisional: Expert Review.
Date field update for provisional registrations: First Come First Served.
permanent, 0x00-0x3f: Standards Action or IESG Approval.
permanent, greater than 0x3f: Specification Required.
first unassigned codepoint: Standards Action.
values 0x29 * N + 0x17 (for integer values of N): Reserved.
Lucas Pardue David Schinazi
RFC 9484
Expert Review Tommy Pauly Magnus Westerlund
Multiprotocol Label Switching Architecture (MPLS)
RFC 8287
0-250: Standards Action.
251-254: Experimental Use.
RFC 8029
Standards Action
RFC 6425
Standards Action
RFC 8611
Standards Action
RFC 8611
Standards Action
RFC 8029, RFC 9041
0-191: Standards Action.
192-247: RFC Required.
248-251: Experimental Use.
252-255: Private Use.
RFC 6427, RFC 7214
0-191: Standards Action.
192-247: Specification Required.
RFC 8227
Specification Required Weiqiang Cheng Jie Dong
RFC 8169
0-127: IETF Review.
128-191: First Come First Served.
RFC 8029
0-250: Standards Action.
251-254: Experimental Use.
Standards Action
RFC 9994
0-14: IETF Review.
15-16: Experimental Use.
17-19: Private Use.
20-439: IETF Review.
RFC 9994
1-110: IETF Review.
111-114: Experimental Use.
115-126: Private Use.
127: IETF Review.
RFC 8029
1-250: Standards Action.
251-254: Experimental Use.
RFC 8287
0-250: Standards Action.
251-254: Experimental Use.
RFC 8287
0-250: Standards Action.
251-254: Experimental Use.
RFC 7555
Standards Action
RFC 8029, RFC 9041
0-191: Standards Action.
192-247: RFC Required.
248-251: Experimental Use.
252-255: Private Use.
RFC 7110
0x0000-0xFFFB: Standards Action.
0xFFFC-0xFFFF: Experimental Use.
RFC 8029, RFC 9041
0-191: Standards Action.
192-247: RFC Required.
248-251: Experimental Use.
252-255: Private Use.
RFC 9779
1-175: IETF Review.
176-239: First Come First Served.
240-251: Experimental Use.
252-254: Private Use.
RFC 8029, RFC 9041
0-16383: Standards Action.
16384-31739: RFC Required.
31740-31743: Experimental Use.
31744-32767: First Come First Served.
32768-49161: Standards Action.
49162-64507: RFC Required.
64508-64511: Experimental Use.
64512-65535: First Come First Served.
Multipurpose Internet Mail Extensions (MIME) and Media Types
RFC 4289
RFC publication required
RFC 7193
Expert Review Russ Housley Sean Turner
RFC 7193
Expert Review Russ Housley Sean Turner
RFC 4733
Specification Required
RFC 7763
First Come First Served
RFC 6838, RFC 4855
Expert Review for Vendor and Personal Trees. For Standards Tree, see RFC 6838, Section 3.1. Alexey Melnikov Darrel Miller Murray Kucherawy
RFC 7114
Specification Required Russ Housley Sean Turner (secondary)
RFC 6838
FCFS (Organization subject to IESG Approval)
RFC 8460
Specification Required Murray Kucherawy
RFC 6838
Expert Review Alexey Melnikov Darrel Miller
RFC 2425
Two-week comment period, expert review Rolf Sonneveld Andrew Findlay
RFC 2425
Two-week comment period, expert review Rolf Sonneveld Andrew Findlay
RFC 2425
Two-week comment period, expert review Rolf Sonneveld Andrew Findlay
RFC 9694
Standards Action
Named Information
Namespaces for IP over IEEE 1394
Negative-ACKnowledgment (NACK) Oriented Reliable Multicast (NORM) Parameters
RFC 5740
Specification Required
RFC 5740
Specification Required
RFC 5740
Specification Required
Netnews Parameters
Network Configuration Protocol (NETCONF) Capability URNs
Network File System version 4 (NFSv4)
RFC 8881
First Come First Served
RFC 8881
Standards Action with Expert Review
RFC 8881, RFC 7530
Specification Required for new registrations; updates to fields other than the contact field require Expert Review or IESG Approval
RFC 8881
ietf.org domain: Standards Action with Expert Review.
non-ietf.org. domain: First Come First Served.
RFC 8881
Standards Action with Expert Review
RFC 8881
Standards Action with Expert Review
Network Layer Protocol Identifiers (NLPIDs) of Interest
Network News Transfer Protocol (NNTP) Parameters
RFC 3977
Labels beginning with X are reserved for private use. All others: Standards Track RFC or an IESG-approved experimental protocol.
RFC 8054
First Come First Served
Network Service Header (NSH) Parameters
RFC 8300
Standards Action
RFC 8300
0x0000-0x01FF: IETF Review.
0x0200-0xFFF5: Expert Review.
Carlos Pignataro Joel Halpern Jim Guichard
RFC 8300
IETF Review
RFC 8300
Expert Review Carlos Pignataro Joel Halpern Jim Guichard
RFC 8300
Standards Action
Network Time Protocol (NTP) Parameters
RFC 5905, RFC 5906, RFC 9748
Specification Required Kurt Kristof Teichel Miroslav Lichvar David Venhoek
RFC 5905, RFC 9748
Specification Required Kurt Kristof Teichel Miroslav Lichvar David Venhoek
RFC 5905, RFC 9748
Specification Required Kurt Kristof Teichel Miroslav Lichvar David Venhoek
Network Time Security (NTS)
RFC 8915
0-1023: IETF Review.
1024-32767: Specification Required.
32768-65535: Private or Experimental Use.
Miroslav Lichvar Daniel Franke
RFC 8915
0-1023: IETF Review.
1024-16383: Specification Required.
16384-32767: Private or Experimental Use.
Miroslav Lichvar Daniel Franke
RFC 8915
0-1023: IETF Review.
1024-32767: Specification Required.
32768-65535: Private or Experimental Use.
Miroslav Lichvar Daniel Franke
RFC 8915
0-1023: IETF Review.
1024-32767: Specification Required.
32768-65535: Private or Experimental Use.
Miroslav Lichvar Daniel Franke
Network Virtualization Overlay (NVO3)
RFC 8926
0x0000-0x00FF: IETF Review.
0x0100-0xFEFF: First Come First Served.
0xFF00-0xFFFF: Experimental Use.
Next Hop Resolution Protocol (NHRP) Types
RFC 2332
Expert Review Jim Luciani
RFC 2332
Expert Review Jim Luciani
Novell Service Advisor Protocol (SAP) Numbers - Novell Object Types

IANA does not assign
NSIS Signaling Layer Protocol (NSLP) Parameters
RFC 5974
0-63: IETF Review.
64-127: Specification Required.
RFC 5974
1-1023: IETF Review.
1024-1999: Specification Required.
RFC 5974
0-63: IETF Review.
64-127: Specification Required.
RFC 5974
0-63: IETF Review.
64-127: Specification Required.
RFC 5975
Specification Required
RFC 5981
Specification Required
RFC 5974
0-63: IETF Review.
64-127: Specification Required.
RFC 5974
0-63: IETF Review.
64-127: Specification Required.
OAuth Parameters
RFC 6749, RFC 8414
Specification Required Hannes Tschofenig Mike Jones
RFC 6749
Specification Required Hannes Tschofenig Mike Jones
RFC 8414
Specification Required Mike Jones Nat Sakimura John Bradley Dick Hardt
RFC 7591
Specification Required Justin Richer
RFC 6749
Specification Required Hannes Tschofenig Mike Jones
RFC 6749
Specification Required Hannes Tschofenig Mike Jones
RFC 9728
Specification Required Michael Jones Dick Hardt
RFC 7591, RFC 8414
Specification Required Justin Richer
RFC 7662
Specification Required Justin Richer
RFC 7009
Specification Required Torsten Lodderstedt Mike Jones
RFC 6755
Specification Required Hannes Tschofenig Mike Jones
RFC 7636
Specification Required John Bradley Mike Jones
One Time Password (OTP) Parameters
One-Way Active Measurement Protocol (OWAMP) Parameters
RFC 7718
IETF Review
Open Pluggable Edge Services (OPES)
RFC 4037
Expert Review for standards-track registration
Open Shortest Path First (OSPF)
RFC 4124
0-239: Specification Required.
240-255: Reserved for Private Use.
Open Shortest Path First (OSPF) Authentication Codes
Open Shortest Path First (OSPF) Link Local Signalling (LLS) - Type/Length/Value Identifiers (TLV)
RFC 5613
Expert Review Gunter Van De Velde Peter Psenak
Open Shortest Path First (OSPF) Multi-Topology Routing
RFC 4915
0-2: Reserved.
3-31: IETF Review.
32-127: Reserved.
128-255: Reserved.
Open Shortest Path First (OSPF) Opaque Link-State Advertisements (LSA) Option Types
RFC 5250
0-127: IETF Review.
128-255: Private Use.
Open Shortest Path First (OSPF) Parameters
RFC 9667
IETF Review or IESG Approval
RFC 9667
IETF Review or IESG Approval
RFC 7770
1-32767: IETF Review.
32768-32777: Experimentation.
32778-65535: Reserved.
RFC 9013
1-34999: Standards Action.
35000-65499: First Come First Served.
Open Shortest Path First (OSPF) Signature Algorithms
Open Shortest Path First (OSPF) Traffic Engineering TLVs
Open Shortest Path First v2 (OSPFv2) Parameters
RFC 2328, RFC 4940
1-127: Standards Action.
128-255: Reserved.
RFC 9350
IETF Review or IESG Approval
RFC 9350
IETF Review or IESG Approval
RFC 7684
IETF Review or IESG Approval
RFC 7684, RFC 9356
IETF Review or IESG Approval
RFC 7684
IETF Review or IESG Approval
RFC 7684
IETF Review or IESG Approval
RFC 7684
IETF Review or IESG Approval
RFC 4940
1-255: Standards Action.
256-65519: Reserved.
65520-65527: Experimentation.
65528-65535: Vendor Private Use.
RFC 6549
Standards Action
RFC 2328, RFC 4940
1-127: Standards Action.
128-255: Reserved.
RFC 4940
1-127: Standards Action.
128-255: Reserved.
Open Shortest Path First v3 (OSPFv3) Authentication Trailer Options
Open Shortest Path First v3 (OSPFv3) Parameters
RFC 5820
IETF Review
RFC 7503
IETF Review or IESG Approval
RFC 8362, RFC 9356
4-32767: IETF Review or IESG Approval.
33024-45055: First Come First Served.
RFC 8362
9-32767: IETF Review or IESG Approval.
33024-45055: First Come First Served.
RFC 7770
0-255: IETF Review.
256-8175: Reserved.
8176-8183: Experimentation.
8184-8190: Vendor Private Use.
8191: Reserved.
RFC 4940
0-127: Standards Action.
128-255: Reserved.
RFC 9513
0-32767: IETF Review or IESG Approval.
33024-45055: First Come First Served.
RFC 9513
0-32767: IETF Review or IESG Approval.
33024-45055: First Come First Served.
Open Systems Interconnection (OSI) Network Service Access Point Addresses (NSAPA) Internet Code Point Registry
OpenPGP
RFC 9580
Specification Required Daniel Kahn Gillmor Andrew Gallagher Heiko Schäfer
RFC 9580
Specification Required Daniel Kahn Gillmor Andrew Gallagher Heiko Schäfer
RFC 9580
Specification Required Daniel Kahn Gillmor Andrew Gallagher Heiko Schäfer
RFC 9580
Specification Required Daniel Kahn Gillmor Andrew Gallagher Heiko Schäfer
RFC 9580
Specification Required Daniel Kahn Gillmor Andrew Gallagher Heiko Schäfer
RFC 9580
Specification Required Daniel Kahn Gillmor Andrew Gallagher Heiko Schäfer
RFC 9580
Specification Required Daniel Kahn Gillmor Andrew Gallagher Heiko Schäfer
RFC 9580
Specification Required Daniel Kahn Gillmor Andrew Gallagher Heiko Schäfer
RFC 9580
Specification Required Daniel Kahn Gillmor Andrew Gallagher Heiko Schäfer
RFC 9580
Specification Required Daniel Kahn Gillmor Andrew Gallagher Heiko Schäfer
RFC 9580
Specification Required Daniel Kahn Gillmor Andrew Gallagher Heiko Schäfer
RFC 9580
Specification Required Daniel Kahn Gillmor Andrew Gallagher Heiko Schäfer
RFC 9580
Specification Required Daniel Kahn Gillmor Andrew Gallagher Heiko Schäfer
RFC 9580
Specification Required Daniel Kahn Gillmor Andrew Gallagher Heiko Schäfer
RFC 9580
Specification Required Daniel Kahn Gillmor Andrew Gallagher Heiko Schäfer
RFC 9580
Specification Required Daniel Kahn Gillmor Andrew Gallagher Heiko Schäfer
RFC 9580
Specification Required Daniel Kahn Gillmor Andrew Gallagher Heiko Schäfer
RFC 9580
Specification Required Daniel Kahn Gillmor Andrew Gallagher Heiko Schäfer
RFC 9580
Specification Required Daniel Kahn Gillmor Andrew Gallagher Heiko Schäfer
RFC 9580
Specification Required Daniel Kahn Gillmor Andrew Gallagher Heiko Schäfer
RFC 9580
Specification Required Daniel Kahn Gillmor Andrew Gallagher Heiko Schäfer
RFC 9580
Specification Required Daniel Kahn Gillmor Andrew Gallagher Heiko Schäfer
RFC 9580
Specification Required Daniel Kahn Gillmor Andrew Gallagher Heiko Schäfer
RFC 9580
Specification Required Daniel Kahn Gillmor Andrew Gallagher Heiko Schäfer
RFC 9580
Specification Required Daniel Kahn Gillmor Andrew Gallagher Heiko Schäfer
RFC 9580
Specification Required Daniel Kahn Gillmor Andrew Gallagher Heiko Schäfer
Operating System Names
RFC 952
First Come First Served
RFC 3659
First Come First Served
RFC 3659
First Come First Served
Optimized Link State Routing (OLSR) Protocol Message Types
RFC 3626
1-127: Standards Action.
128-255: Private/Local Use.
Opus Channel Mapping Families
RFC 7845, RFC 8486
Specification Required Tim Terriberry Ralph Giles
OSPF Database Description (DD) Packet Flags
Packet CAPture (PCAP)
draft-ietf-opsawg-pcaplinktype-18
0-65000: Expert Review.
65001-65535: Experimental Use.
Packet Sampling (PSAMP) Parameters
PAL Package Types
RFC 8295
Expert Review Sean Turner
Path Computation Element Protocol (PCEP) Numbers
RFC 8733
0-65503: IETF Review.
65504-65535: Experimental Use.
RFC 8779, RFC 9756
0-244: IETF Review.
245-255: Experimental Use.
RFC 5521
IETF Review
RFC 5541
1-1023: IETF Review.
1024-32767: First Come First Served.
32768-65535: Reserved for Private Use.
RFC 9168
0-255: Reserved.
256-64506: Specification Required.
64507-65531: First Come First Served.
65532-65535: Experimental Use.
RFC 5440
0-251: IETF Review.
252-255: Experimental Use.
RFC 5440
0-247: IETF Review.
248-255: Experimental Use.
RFC 5440
0-65503: IETF Review.
65504-65535: Experimental Use.
RFC 5440, RFC 9756
0-251: IETF Review.
252-255: Experimental Use.
RFC 5521
IETF Review
RFC 5521
IETF Review
Peer-to-Peer Streaming Peer Protocol (PPSPP)
Peer-to-Peer Streaming Tracker Protocol (PPSTP)
Per Hop Behavior Identification Codes
RFC 3140
Expert or area director review Primary: Brian Carpenter; Secondary: David Black
Performance Metrics
RFC 8911
Specification Required Greg Mirsky Michael Scharf
RFC 8911
Specification Required Greg Mirsky Michael Scharf
RFC 8911
Specification Required Greg Mirsky Michael Scharf
RFC 8911
Specification Required Greg Mirsky Michael Scharf
RFC 8911
Specification Required Greg Mirsky Michael Scharf
RFC 8911
Specification Required Greg Mirsky Michael Scharf
RFC 8911
Specification Required Greg Mirsky Michael Scharf
Permanent IPv6 Multicast Group Identifiers
RFC 3307
Expert Review Stig Venaas
Point-to-Point (PPP) Protocol Field Assignments
RFC 1552
Expert Review James Carlson
RFC 1378
Expert Review James Carlson
RFC 1994
Expert Review James Carlson
RFC 1661, RFC 3818
0xxx-3xxx: IETF Review.
4xxx-7xxx: IETF Review.
8xxx-bxxx: IETF Review.
cxxx-fxxx: IETF Review.
RFC 1968
Expert Review James Carlson
RFC 1377
Expert Review James Carlson
RFC 2516, RFC 8822
Specification Required Donald Eastlake
RFC 1963
Expert Review James Carlson
Point-to-Point Over Ethernet (PPPoE) Parameters
RFC 4937
First Come First Served
Port Control Protocol (PCP) Parameters
RFC 6887
0-31, 127: Standards Action.
32-63: Specification Required.
Dan Wing Stuart Cheshire
RFC 6887
0-63, 127-191, 255: Standards Action.
64-95, 192-223: Specification Required.
Dan Wing Stuart Cheshire
RFC 6887
0-127, 255: Standards Action.
128-191: Specification Required.
Dan Wing Stuart Cheshire
Portable Symmetric Key Container (PSKC)
RFC 6030
Standards Action
Post Office Protocol version 3 (POP3) Extension Mechanism
RFC 2449
Standards Track or IESG-approved Experimental RFC
RFC 2449
RFC Specification Required
Post-Stack First Nibble
Posture Attribute (PA) Protocol Compatible with Trusted Network Connect (TNC) Parameters
RFC 5792
Specification Required Steve Hanna Jessica Fitzgerald-McKay Charles Schmidt
RFC 5792
Specification Required Steve Hanna Jessica Fitzgerald-McKay Charles Schmidt
RFC 5792
Specification Required Steve Hanna Jessica Fitzgerald-McKay Charles Schmidt
RFC 8412
Specification Required David Waltermire Jessica Fitzgerald-McKay
Posture Broker (PB) Protocol Compatible with Trusted Network Connect (TNC) Parameters
RFC 5793
Specification Required Steve Hanna Jessica Fitzgerald-McKay Charles Schmidt
RFC 5793
Specification Required Steve Hanna Jessica Fitzgerald-McKay Charles Schmidt
RFC 5793
Specification Required Steve Hanna Jessica Fitzgerald-McKay Charles Schmidt
RFC 5793
Specification Required Steve Hanna Jessica Fitzgerald-McKay Charles Schmidt
Power State Sets
PRECIS Derived Property Value
RFC 8264, RFC 5892
Expert Review Patrik Fältström
Preparation and Comparison of Internationalized Strings (PRECIS) Parameters
RFC 8264
Expert Review Peter Saint-Andre (primary) Pete Resnick (secondary) Andrew Sullivan (backup)
Presence SRV Protocol Label Registry
RFC 3861
Specification Required
Printer MIB Interpreters Language Families - OBSOLETE
RFC 3805
Expert Review Ira McDonald Michael Sweet
Privacy Enhanced RTP Conferencing (PERC)
Privacy Pass
RFC 9577
Specification Required Tommy Pauly Chris Wood
Probabilistic Routing Protocol using History of Encounters and Transitivity (PRoPHET)
RFC 6693
Specification Required
RFC 6693
Specification Required
RFC 6693
Specification Required
RFC 6693
Specification Required
RFC 6693
Specification Required
RFC 6693
Specification Required
RFC 6693
Specification Required
RFC 6693
Specification Required
RFC 6693
Specification Required
RFC 6693
Specification Required
RFC 6693
Specification Required
RFC 6693
Specification Required
RFC 6693
Specification Required
Profile URIs
RFC 7284
First Come First Served (Specification Suggested)
Pronet 80 Type Numbers

IANA does not assign
Protocol for Carrying Authentication for Network Access (PANA) Parameters
RFC 5191, RFC 6786
Expert Review with Specification Required, or Standards Action Alper Yegin
RFC 5191, RFC 5872
Standards Action or IESG Approval
RFC 5191, RFC 5872
Standards Action or IESG Approval
RFC 5191, RFC 5872
1-65519: IETF Review or IESG Approval.
65520-65535: IANA does not assign.
Protocol Independent Multicast (PIM) Parameters
RFC 7761, RFC 3973
First Come First Served (expire in 1 year); Specification Required for Permanent assignments Stig Venaas Jeffrey (Zhaohui) Zhang
Protocol Numbers
RFC 5237, RFC 7045
IESG Approval or Standards Action
Protocol to Access White-Space (PAWS)
RFC 7545
Specification Required
RFC 7545
Specification Required
RFC 7545
Specification Required
Provisioning Domains (PvDs)
RFC 8801
Expert Review Tommy Pauly David Schinazi
RFC 8801
Standards Action
RFC 9704
Expert Review Tommy Pauly Tirumaleswar Reddy.K Benjamin M. Schwartz
Proxy Certificate Policy Languages
Pseudowire Name Spaces (PWE3)
RFC 4446
2-64: Expert Review.
65-127: IETF Review.
128-254: First Come First Served.
255: IETF Review.
Stewart Bryant Andrew Malis Matthew Bocci
RFC 4446
2-64: Expert Review.
65-127: IETF Review.
128-254: First Come First Served.
255: IETF Review.
Stewart Bryant Andrew Malis Matthew Bocci
RFC 7275
0x0000: IETF Review.
0x003B-0x1FFF: Expert Review.
0x2000-0x2FFF: IETF Review.
0x3000-0x3FFE: First Come First Served.
0x3FFF: IETF Review.
Stewart Bryant Matthew Bocci
RFC 4446
31-1024: Expert Review.
1025-4096: IETF Review.
4097-32766: First Come First Served.
32767: IETF Review.
Stewart Bryant Andrew Malis Matthew Bocci
RFC 4446
2-64: Expert Review.
65-127: IETF Review.
128-254: First Come First Served.
255: IETF Review.
Stewart Bryant Andrew Malis Matthew Bocci
RFC 4446
Expert Review Stewart Bryant Andrew Malis Matthew Bocci
RFC 6073
0: IETF Review.
1-64: Expert Review.
65-127: IETF Review.
128-254: First Come First Served.
255: IETF Review.
Primary: Stewart Bryant; secondary: Matthew Bocci
RFC 8237
0x00: IETF Review.
0x04-0x40: Expert Review.
0x41-0x7F: IETF Review.
0x80-0xFE: Expert Review.
0xFF: IETF Review.
Stewart Bryant Andrew Malis
RFC 8237
0x00: IETF Review.
0x03-0x40: Expert Review.
0x41-0x7F: IETF Review.
0x80-0xFE: Expert Review.
0xFF: IETF Review.
Stewart Bryant Andrew Malis
RFC 8237
0x00000000: IETF Review.
0x00000008-0x00010000: Expert Review.
0x00010001-0x08000000: IETF Review.
0x08000001-0xFFFFFFFE: Expert Review.
0xFFFFFFFF: IETF Review.
Stewart Bryant Andrew Malis
PT-EAP: Posture Transport (PT) Protocol For EAP Tunnel Methods
RFC 7171
Standards Action
Public Data Network Numbers
RFC 1356
Registrations no longer accepted
Public Key Infrastructure using X.509 (PKIX) Parameters
RFC 8659
Specification Required Phillip Hallam-Baker
RFC 4386
Specification Required
Public Notary Transparency
RFC 9162
Specification Required
RFC 9162
0x00-0xDF: Specification Required.
0xE0-0xEF: Experimental Use.
0xF0-0xFF: Private Use.
RFC 9162
0x0000-0xDFFF: Specification Required.
0xE000-0xEFFF: Experimental Use.
0xF000-0xFFFF: Private Use.
RFC 9162
First Come First Served
RFC 9162
0x0000-0x0807: Specification Required.
0x0808-0xFDFF: Expert Review.
0xFE00-0xFEFF: Experimental Use.
0xFF00-0xFFFF: Private Use.
RFC 9162
0x0100-0xDFFF: Specification Required.
0xE000-0xEFFF: Experimental Use.
0xF000-0xFFFF: Private Use.
QoS NSIS Signal Layering Protocol (NSLP) QSPEC Parameters
RFC 5975
Specification Required
RFC 5976
Specification Required
RFC 5975
Specification Required
RFC 5975
Specification Required
RFC 5975
Specification Required
RFC 5975
Specification Required
RFC 5975
Specification Required
RFC 5976
Specification Required
RFC 5976
Specification Required
RFC 5975
Specification Required
QUIC
RFC 9000
provisional: Expert Review.
provisional registration Date field update: First Come First Served.
permanent, 0x00-0x3f: Standards Action or IESG Approval.
permanent, greater than 0x3f: Specification Required.
first unassigned codepoint: Standards Action.
Jana Iyengar Ian Swett Martin Thomson
RFC 9000
provisional: Expert Review.
provisional registration Date field update: First Come First Served.
permanent, 0x00-0x3f: Standards Action or IESG Approval.
permanent, greater than 0x3f: Specification Required.
first unassigned codepoint: Standards Action.
Jana Iyengar Ian Swett Martin Thomson
RFC 9000
provisional: Expert Review.
provisional registration Date field update: First Come First Served.
permanent, 0x00-0x3f: Standards Action or IESG Approval.
permanent, greater than 0x3f: Specification Required.
first unassigned codepoint: Standards Action.
values 31 * N + 27 (for integer values of N): Reserved.
Jana Iyengar Ian Swett Martin Thomson
RFC 9000
provisional: Expert Review.
provisional registration Date field update: First Come First Served.
permanent: Specification Required.
first unassigned codepoint: Standards Action.
value 0x?a?a?a?a: Reserved.
Jana Iyengar Ian Swett Martin Thomson
Radius Types
RFC 8044
Standards Action
RFC 5580
Expert Review Alan DeKok Mohit Sethi
RFC 5580
Expert Review Alan DeKok Mohit Sethi
RFC 5580
Expert Review Alan DeKok Mohit Sethi
RFC 3575, RFC 6929, RFC 8044
1-191: IETF Review.
192-240: Reserved for Private Use.
224-240: Implementation Specific.
241-246 (extended space, Unassigned): IETF Review.
241-246 (extended space, Reserved): Standards Action.
247-255: Reserved.
RFC 5580
Expert Review Alan DeKok Mohit Sethi
RFC 2865, RFC 3575
Expert Review Alan DeKok Margaret Cullen
RFC 2865, RFC 3575
Expert Review Alan DeKok Margaret Cullen
RFC 5607
Specification Required Alan DeKok Margaret Cullen
RFC 2865, RFC 3575
Expert Review Alan DeKok Margaret Cullen
RFC 2865, RFC 3575
Expert Review Alan DeKok Margaret Cullen
RFC 2866, RFC 3575
Expert Review Alan DeKok Margaret Cullen
RFC 2866, RFC 3575
Expert Review Alan DeKok Margaret Cullen
RFC 2866, RFC 3575
Expert Review Alan DeKok Margaret Cullen
RFC 2865, RFC 3575
Expert Review Alan DeKok Margaret Cullen
RFC 3575
Expert Review Alan DeKok Margaret Cullen
RFC 3575
Expert Review Alan DeKok Margaret Cullen
RFC 2865, RFC 3575
Expert Review Alan DeKok Margaret Cullen
RFC 2869, RFC 3575
Expert Review Alan DeKok Margaret Cullen
RFC 2869, RFC 3575
Expert Review Alan DeKok Margaret Cullen
Real Time Streaming Protocol (RTSP)/1.0 Parameters
RFC 2326
Standards Document, preferably an IETF RFC
RFC 2326
Standards Action
RFC 2326
Specification Required
RFC 2326
Standards Action
Real-time Inter-network Defense (RID)
RFC 6545
Specification Required
Real-Time Streaming Protocol (RTSP) 2.0 Parameters
RFC 7826
Standards Action or IESG Approval
RFC 7826
First Come First Served
RFC 7826
Specification Required Martin Stiemerling
RFC 7826
Specification Required Martin Stiemerling
RFC 7826
Specification Required Martin Stiemerling
RFC 7826
Expert Review Martin Stiemerling
RFC 7826
Specification Required Martin Stiemerling
RFC 7826
Standards Action
RFC 7826
Specification Required Martin Stiemerling
RFC 7826
Specification Required Martin Stiemerling
RFC 7826
Expert Review Martin Stiemerling
RFC 7826
Standards Action
RFC 7826
Specification Required Martin Stiemerling
RFC 7826
Specification Required Martin Stiemerling
Real-Time Transport Protocol (RTP) Parameters
RFC 8870
Specification Required
RFC 8870
Specification Required
RFC 4585
Specification Required Magnus Westerlund
RFC 4585
Specification Required Magnus Westerlund
RFC 6285
1xx: Informational.
2xx: Success.
3xx: Redirection.
4xx: RTP Receiver (RTP_Rx) Error.
5xx: Burst/Retransmission Source (BRS) Error.
Specification Required
RFC 6285
Specification Required
RFC 5761, RFC 3550
1-191: Specification Required or Expert Review.
194-199: Specification Required or Expert Review.
200-223: Specification Required or Expert Review.
224-254: Specification Required or Expert Review.
Magnus Westerlund
RFC 8285
Expert Review Magnus Westerlund
RFC 3550
Standards Action or Expert Review
RFC 7941
Expert Review Magnus Westerlund
RFC 3550
Specification Required or Expert Review Magnus Westerlund
RFC 6285
Specification Required
Realm Specific IP (RSIP) Parameters
RFC 3103
0: Reserved.
1-240: Specification Required.
241-255: Private Use.
RFC 3103
Specification Required
RFC 3103
0: Reserved.
1-240: Specification Required.
241-255: Private Use.
RFC 3103
0: Reserved.
1-240: Specification Required.
241-255: Private Use.
RFC 3103
0: Reserved.
1-240: Specification Required.
241-255: Private Use.
RFC 3103
0: Reserved.
1-240: Specification Required.
241-255: Private Use.
RFC 3103
0: Reserved.
1-240: Specification Required.
241-255: Private Use.
RFC 3103
0: Reserved.
1-240: Specification Required.
241-255: Private Use.
RFC 3103
0: Reserved.
1-240: Specification Required.
241-255: Private Use.
Realtime Traffic Flow Measurement (RTFM)
RFC 2722
0-511: IETF Review.
512-1023: First Come First Served.
1024 and above: Reserved for Private Use.
Registrar IDs

Assigned by ICANN
Registration Data Access Protocol (RDAP)
RFC 7480
Specification Required Jasdip Singh Scott Hollenbeck
RFC 9083, RFC 9537
Expert Review Jasdip Singh Scott Hollenbeck
RFC 8521
First Come First Served
RFC 9536
Specification Required Jasdip Singh Scott Hollenbeck
RFC 9536
Specification Required Jasdip Singh Scott Hollenbeck
RFC 9560
Specification Required Scott Hollenbeck Andrew Newton Mario Loffredo Pawel Kowalik Jasdip Singh
Registry for the Session Initiation Protocol (SIP) NAPTR Resource Record Services Field
Relay User Equipment (RUE)
RFC 9248
Expert Review Brian Rosen
Reliable Multicast Transport (RMT) FEC Encoding IDs and FEC Instance IDs
Reliable Server Pooling (RSerPool) Parameters
RFC 5354
Specification Required
RFC 5354
Specification Required
RFC 5356
Specification Required
RFC 5353
Specification Required
Remote Attestation Procedures (RATS)
RFC 9711
Expert Review Giridhar Mandyam Jeremy O'Donoghue
Remote Direct Data Placement
RFC 8797
Specification Required Chuck Lever (primary) Tom Talpey (secondary)
Remote Direct Data Placement (RDDP)
RFC 6580
Standards Action
RFC 6580
Standards Action
RFC 6580
Standards Action
Remote Framebuffer (RFB)
RFC 6143
Expert Review Tristan Richardson John Levine
RFC 6143
Expert Review Tristan Richardson
Remote Procedure Call (RPC)
RFC 5665
First Come First Served or Standards Action
Remote Procedure Call (RPC) Program Numbers
RFC 5531
Up to 100 numbers: First Come First Served.
101-1000 numbers: Specification Required.
More than 1000 numbers: IESG Approval.
Reputation Parameters
RFC 7071
IETF Review or Specification Required
Reserved IPv6 Interface Identifiers
REsource LOcation And Discovery (RELOAD)
RFC 6940
1-32767: Standards Action.
32768-61440: Expert Review.
Marc Petit-Huguenin (primary) Cullen Jennings (secondary)
RFC 6940
0x00000001-0x7fffffff: Standards Action.
0x8000000-0xf0000000: Expert Review.
Marc Petit-Huguenin (primary) Cullen Jennings (secondary)
RFC 6940
Standards Action
RFC 6940
Standards Action
RFC 6940
Specification Required Marc Petit-Huguenin (primary) Cullen Jennings (secondary)
RFC 6940
01-127: Standards Action.
128-254: Specification Required.
Marc Petit-Huguenin (primary) Cullen Jennings (secondary)
RFC 6940
Standards Action
RFC 7374
Specification Required
Resource Public Key Infrastructure (RPKI)
RFC 8205
Standards Action
RFC 8205
Standards Action
RFC 6488
Standards Action
RFC 6810
Expert Review Keyur Patel (Primary) John G. Scudder (Secondary)
RFC 6810
RFC Required (Standards Track or Experimental)
Resource Reservation Protocol (RSVP) Parameters
RFC 3936
0-119: Standards Action.
120-123: Expert Review.
124-127: Reserved for Private Use.
128-183: Standards Action.
184-187: Expert Review.
188-191: Reserved for Private Use.
192-247: Standards Action.
248-251: Expert Review.
252-255: Reserved for Private Use.
Dimitri Papadimitriou
RFC 3936
0-239: Standards Action.
240-251: Expert Review.
252-255: Reserved for Private Use.
Dimitri Papadimitriou
RFC 3936
0-239: Standards Action.
240-255: Expert Review.
Dimitri Papadimitriou
RFC 2207
0: Reserved.
1-10: Reserved.
11-8191: Not Defined.
8192-65535: Dynamic.
Resource Reservation Protocol-Traffic Engineering (RSVP-TE) Parameters
RFC 8169
0-127: IETF Review.
128-191: First Come First Served.
RFC 7689
Standards Action or Specification Required
Resource-Oriented Lightweight Information Exchange (ROLIE) URN Parameters
RFC 8322
Specification Required David Waltermire Stephen Banghart
RFC 8322
Specification Required David Waltermire Stephen Banghart
RESTCONF Capability URNs
RObust Header Compression (ROHC) Profile Identifiers
RFC 5795
Specification Required
RObust Header Compression (ROHC) Suboption Identifier Values
RFC 3241
0-127: Standards Action.
128-254: Specification Required.
Roughtime
draft-ietf-ntp-roughtime-19
0x01-0x0x7fffffff: IETF Review.
0x80000000-0xbfffffff: Experimental Use.
0xc0000000-0xffffffff: Private Use.
Route Distinguisher Type Field
RFC 4364
0-32767: First Come First Served.
32768-65535: IETF Review.
Routing in Fat Trees (RIFT)
RFC 9692
Specification Required Tony Przygienda
RFC 9692
Minor change (per RFC9692, Section 7): Expert Review.
All other allocations: Specification Required.
Tony Przygienda
RFC 9692
Minor change (per RFC9692, Section 7): Expert Review.
All other allocations: Specification Required.
Tony Przygienda
RFC 9692
Minor change (per RFC9692, Section 7): Expert Review.
All other allocations: Specification Required.
Tony Przygienda
RFC 9692
Minor change (per RFC9692, Section 7): Expert Review.
All other allocations: Specification Required.
Tony Przygienda
RFC 9692
Minor change (per RFC9692, Section 7): Expert Review.
All other allocations: Specification Required.
Tony Przygienda
RFC 9692
Minor change (per RFC9692, Section 7): Expert Review.
All other allocations: Specification Required.
Tony Przygienda
RFC 9692
Minor change (per RFC9692, Section 7): Expert Review.
All other allocations: Specification Required.
Tony Przygienda
RFC 9692, RFC 9992
Minor change (per RFC9692, Section 7): Expert Review.
All other allocations: Specification Required.
Tony Przygienda
RFC 9692
Minor change (per RFC9692, Section 7): Expert Review.
All other allocations: Specification Required.
Tony Przygienda
RFC 9692
Minor change (per RFC9692, Section 7): Expert Review.
All other allocations: Specification Required.
Tony Przygienda
RFC 9692
Minor change (per RFC9692, Section 7): Expert Review.
All other allocations: Specification Required.
Tony Przygienda
RFC 9692
Minor change (per RFC9692, Section 7): Expert Review.
All other allocations: Specification Required.
Tony Przygienda
RFC 9692
Minor change (per RFC9692, Section 7): Expert Review.
All other allocations: Specification Required.
Tony Przygienda
RFC 9692
Minor change (per RFC9692, Section 7): Expert Review.
All other allocations: Specification Required.
Tony Przygienda
RFC 9692
Minor change (per RFC9692, Section 7): Expert Review.
All other allocations: Specification Required.
Tony Przygienda
RFC 9692
Minor change (per RFC9692, Section 7): Expert Review.
All other allocations: Specification Required.
Tony Przygienda
RFC 9692
Minor change (per RFC9692, Section 7): Expert Review.
All other allocations: Specification Required.
Tony Przygienda
RFC 9692
Minor change (per RFC9692, Section 7): Expert Review.
All other allocations: Specification Required.
Tony Przygienda
RFC 9692
Minor change (per RFC9692, Section 7): Expert Review.
All other allocations: Specification Required.
Tony Przygienda
RFC 9692
Minor change (per RFC9692, Section 7): Expert Review.
All other allocations: Specification Required.
Tony Przygienda
RFC 9692
Minor change (per RFC9692, Section 7): Expert Review.
All other allocations: Specification Required.
Tony Przygienda
RFC 9692
Minor change (per RFC9692, Section 7): Expert Review.
All other allocations: Specification Required.
Tony Przygienda
RFC 9692
Minor change (per RFC9692, Section 7): Expert Review.
All other allocations: Specification Required.
Tony Przygienda
RFC 9692
Minor change (per RFC9692, Section 7): Expert Review.
All other allocations: Specification Required.
Tony Przygienda
RFC 9692
Minor change (per RFC9692, Section 7): Expert Review.
All other allocations: Specification Required.
Tony Przygienda
RFC 9692
Minor change (per RFC9692, Section 7): Expert Review.
All other allocations: Specification Required.
Tony Przygienda
RFC 9692
Minor change (per RFC9692, Section 7): Expert Review.
All other allocations: Specification Required.
Tony Przygienda
RFC 9692
Minor change (per RFC9692, Section 7): Expert Review.
All other allocations: Specification Required.
Tony Przygienda
RFC 9692
Minor change (per RFC9692, Section 7): Expert Review.
All other allocations: Specification Required.
Tony Przygienda
RFC 9692
Minor change (per RFC9692, Section 7): Expert Review.
All other allocations: Specification Required.
Tony Przygienda
RFC 9692
Minor change (per RFC9692, Section 7): Expert Review.
All other allocations: Specification Required.
Tony Przygienda
RFC 9692
Minor change (per RFC9692, Section 7): Expert Review.
All other allocations: Specification Required.
Tony Przygienda
RFC 9692
Minor change (per RFC9692, Section 7): Expert Review.
All other allocations: Specification Required.
Tony Przygienda
RFC 9692
Minor change (per RFC9692, Section 7): Expert Review.
All other allocations: Specification Required.
Tony Przygienda
RFC 9692
Minor change (per RFC9692, Section 7): Expert Review.
All other allocations: Specification Required.
Tony Przygienda
RFC 9692
Minor change (per RFC9692, Section 7): Expert Review.
All other allocations: Specification Required.
Tony Przygienda
Routing Information Protocol (RIP) Parameters
RFC 1723
Not defined
RFC 2080
Not defined
Routing Protocol for Low Power and Lossy Networks (RPL)
RFC 9914
Standards Action
Routing Protocol for Low Power and Lossy Networks (RPL) Routing Metric/Constraint
RFC 6551
First Come First Served
RSVP-TE OAM Configuration Registry
RFC 7260
0-31: IETF Review.
32-65533: IETF Review.
65534-65535: Reserved for Experimental Use.
RFC 7260
IETF Review
RTP Control Protocol Extended Reports (RTCP XR) Block Type Registry
RFC 7272
Specification Required
RFC 3611
Specification Required Joerg Ott
RFC 6798
Specification Required
RTP Control Protocol Extended Reports (RTCP XR) Session Description Protocol (SDP) Parameters Registry
RFC 3611
Specification Required Joerg Ott
Scalable Adaptive Multicast (SAM) Baseline
RFC 7019
Expert Review Marc Petit-Huguenin (primary) Thomas Schmidt John Buford
RFC 7019
Expert Review Marc Petit-Huguenin (primary) Thomas Schmidt John Buford
RFC 7019
Expert Review Marc Petit-Huguenin (primary) Thomas Schmidt John Buford
Secret Key Transaction Authentication for DNS (TSIG) Algorithm Names
Secure Shell (SSH) Protocol Parameters
RFC 4250, RFC 9519
Expert Review Peter Yee Markus Stenberg
RFC 4250, RFC 9519
0x00000001-0xFDFFFFFF: Expert Review.
0xFE000000-0xFFFFFFFF: Reserved for Private Use.
Peter Yee Markus Stenberg
RFC 4250, RFC 9519
Expert Review Peter Yee Markus Stenberg
RFC 4250, RFC 9519
Expert Review Peter Yee Markus Stenberg
RFC 4250, RFC 9519
Expert Review Peter Yee Markus Stenberg
RFC 4250, RFC 9519
Expert Review Peter Yee Markus Stenberg
RFC 4250, RFC 9519
Expert Review Peter Yee Markus Stenberg
RFC 4250, RFC 9519
0x00000001-0xFDFFFFFF: Expert Review.
0xFE000000-0xFFFFFFFF: Reserved for Private Use.
Peter Yee Markus Stenberg
RFC 4250, RFC 9519
Expert Review Peter Yee Markus Stenberg
RFC 4250, RFC 9519
0x00000001-0xFDFFFFFF: Expert Review.
0xFE000000-0xFFFFFFFF: Reserved for Private Use.
Peter Yee Markus Stenberg
RFC 8308, RFC 9519
Expert Review Peter Yee Markus Stenberg
RFC 4250, RFC 9142, RFC 9519
Expert Review Peter Yee Markus Stenberg
RFC 4250, RFC 9519
Expert Review Peter Yee Markus Stenberg
RFC 4250
Standards Action
RFC 4250, RFC 9519
Expert Review Peter Yee Markus Stenberg
RFC 4250, RFC 9519
Expert Review Peter Yee Markus Stenberg
RFC 4819, RFC 9519
Expert Review Peter Yee Markus Stenberg
RFC 4819, RFC 9519
Expert Review Peter Yee Markus Stenberg
RFC 4819, RFC 9519
Expert Review Peter Yee Markus Stenberg
RFC 4819
0-191: Standards Action.
192-255: Reserved for Private Use.
RFC 4250, RFC 9519
Expert Review Peter Yee Markus Stenberg
RFC 4250, RFC 9519
Expert Review Peter Yee Markus Stenberg
RFC 9987
Expert Review Damien Miller Markus Friedl
RFC 9987
Expert Review Damien Miller Markus Friedl
RFC 9987
Expert Review Damien Miller Markus Friedl
RFC 9987
0-239: Expert Review.
240-255: Private Use.
Damien Miller Markus Friedl
RFC 9987
Expert Review Damien Miller Markus Friedl
RFC 4716, RFC 9519
Expert Review Peter Yee Markus Stenberg
Security Event Token (SET)
RFC 8935
Specification Required Mike Jones John Bradley
RFC 9493
Specification Required Prachi Jain
Security External Enumeration Registry
Security Label Format Selection
Security Parameters Index (SPI) Parameters
security.txt Fields
RFC 9116
Expert Review Yakov Shafranovich Edwin Foudil
Segment Routing
RFC 9256
Specification Required Ketan Talaulikar Matthew Bocci
RFC 9830
Standards Action
RFC 9857
1-250: Expert Review.
251-255: Private Use.
RFC 8986
0: Reserved.
1-32767: First Come First Served.
32768-34815: Private Use.
34816-65534: Reserved.
65535: Reserved.
Selective P-Multicast Service Interface (S-PMSI) Parameters
Semantic Definition Format (SDF)
RFC 9880
Specification Required Ari Keranen (primary) Michael Koster (backup)
RFC 9880
Expert Review Ari Keranen (primary) Michael Koster (backup)
RFC 9880
Specification Required Ari Keranen (primary) Michael Koster (backup)
RFC 9880
Specification Required Ari Keranen (primary) Michael Koster (backup)
Sender Policy Framework (SPF) Parameters
RFC 6652
Specification Required
Sensor Measurement Lists (SenML)
RFC 8798
Expert Review Ari Keränen
RFC 9100
Specification Required Ari Keränen (primary) Carsten Bormann (secondary)
RFC 8428
Expert Review Ari Keränen
RFC 8428
Expert Review Ari Keränen
Server Cache Synchronization Protocol (SCSP) Parameters
RFC 2334
RFC, product of standards body, or Expert Review
Service Function Chaining (SFC) Active Operations, Administration, and Maintenance (OAM)
RFC 9516
0-191: IETF Review.
192-251: First Come First Served.
252-254: Private Use.
RFC 9516
0-31: IETF Review.
32-62: First Come First Served.
RFC 9516
0-175: IETF Review.
176-239: First Come First Served.
240-251: Experimental Use.
252-254: Private Use.
RFC 9516
0-175: IETF Review.
176-239: First Come First Served.
240-251: Experimental Use.
252-254: Private Use.
RFC 9516
Standards Action
RFC 9516
0-191: IETF Review.
192-251: First Come First Served.
252-254: Private Use.
RFC 9516
0-175: IETF Review.
176-239: First Come First Served.
240-251: Experimental Use.
252-254: Private Use.
Service Function Chaining Service Function Types
RFC 9015
1-31: Standards Action.
32-64495: First Come First Served.
64496-65534: Private Use.
Service Location Protocol (SLP) Remote Service Discovery
Service Location Protocol Version 2 (SLPv2) Cryptographic BSD Codes
Service Location Protocol Version 2 (SLPv2) Registrations
RFC 2608
Expert Review Erik Guttman
Service Location Protocol, Version 2 (SLPv2) Error Numbers
RFC 2608
Standards Action
Service Location Protocol, Version 2 (SLPv2) Function IDs
RFC 2608
IETF Review
Service Names and Transport Protocol Port Numbers
RFC 6335
TCP/UDP: Joe Touch; Eliot Lear Kumiko Ono Wes Eddy Brian Trammell and Michael Scharf SCTP: Michael Tuexen DCCP: Eddie Kohler and Yoshifumi Nishida
Session Description Protocol (SDP) Parameters
RFC 4585, RFC 8859
First Come First Served with a permanent, stable, and publically accessible document
RFC 8866
RFC Required
RFC 8841
First Come First Served
RFC 8866, RFC 8864, RFC 8859
Specification Required Flemming Andreasen
RFC 8866, RFC 8859
Standards Action
RFC 8839
Specification Required Christer Holmberg
RFC 5104, RFC 8859
Specification Required Stephan Wenger
RFC 4796, RFC 8859
Specification Required Christer Holmberg
RFC 7195, RFC 8859
Specification Required Bo Burman
RFC 5583, RFC 8859
Specification Required Stephan Wenger
RFC 8866
REGISTRY OBSOLETED - No further registrations accepted
RFC 4568
Standards Action
RFC 8866
Standards Action
RFC 7273, RFC 8859
Specification Required Magnus Westerlund
RFC 8866
RFC Required
RFC 8866
RFC Required
RFC 5432, RFC 8859
Specification Required Christer Holmberg
RFC 8851
Specification Required Adam Roach
RFC 4585, RFC 8859
First Come First Served with permanent, stable, and publically accessible document.
RFC 4567, RFC 8859
Specification Required Magnus Westerlund
RFC 7273, RFC 8859
Specification Required Magnus Westerlund
Session Initiation Protocol (SIP) Common Log Format (CLF) Parameters
RFC 6873
Standards Action
Session Initiation Protocol (SIP) Event Types Namespace
RFC 3427, RFC 6665, RFC 5727
event template packages: Standards Action.
event packages: RFC Required with Designated Expert.
Adam Roach
Session Initiation Protocol (SIP) Parameters
RFC 3486
Standards Action
RFC 6442
Specification Required
RFC 6809
Specification Required Paul Kyzivat (primary) Christer Holmberg (secondary)
RFC 3261, RFC 5727
Informational Header: Expert Review.
Standard Header: Standards Action.
Adam Roach
RFC 8224
Standards Action
RFC 8224
Deprecated and closed per RFC8224
RFC 6086
Specification Required Adam Roach
RFC 3261, RFC 5727
Standards Action
RFC 4411
Standards Action
RFC 8599
Specification Required Christer Holmberg
RFC 6665
Standards Action
RFC 3326
Specification Required Christer Holmberg
RFC 3261
RFC Required
RFC 8876
Specification Required Brian Rosen
RFC 6080
Specification Required
RFC 6011
begins with 'sfua-': RFC Required.
all other names: First Come First Served.
RFC 7118
Standards Action
RFC 4575
Specification Required
RFC 7433
Standards Action
RFC 7433
Standards Action
Session Initiation Protocol (SIP) Privacy Header Values
Session Peering Provisioning Framework (SPPF) Organization Identifier Type Namespaces
Session Traversal Utilities for NAT (STUN) Parameters
RFC 8489
0x0000-0x3FFF: IETF Review.
0x4000-0x7FFF: Expert Review.
0x8000-0xBFFF: IETF Review.
0xC000-0xFFFF: Expert Review.
Dan Wing
RFC 8489, RFC 7983
0x000-0x07F: IETF Review.
0x080-0x0FF: Expert Review.
Dan Wing
RFC 8489
0x0000-0x7FFF: IETF Review.
0x8000-0xFFFF: Expert Review.
Dan Wing
RFC 8489
Standards Action
SFrame
RFC 9605
0-0xEFFF: Specification Required.
0-0xEFFF: Standards Action.
0xF000-0xFFFF: Private Use.
Richard Barnes (primary) Emad Omara (secondary)
Shim6 Parameters
RFC 5533
Standards Action
RFC 5533
Standards Action
RFC 5533
Standards Action
Sieve Extensions
RFC 5804
Standards Track or IESG-Approved Experimental RFC
RFC 5804
Standards Track or IESG-Approved Experimental RFC
RFC 5435
Vendor-controlled: First Come First Served.
IETF-controlled: Specification Required.
Barry Leiba Alexey Melnikov
RFC 9122
Expert Review Alexey Melnikov Ken Murchison
RFC 5183
name begins with "vnd.": First Come First Served.
standardized (no "vnd." prefix): Standards track or experimental RFC.
RFC 5228
vendor-controlled (name begins with "vnd."): First Come First Served.
IETF-controlled (no "vnd." prefix): Standards track or IESG-approved experimental RFC.
RFC 5435
Vendor-controlled: First Come First Served.
IETF-controlled: Specification Required.
RFC 6134
Specification Required
SIG (0) Algorithm Numbers
Signaling Compression (SigComp) Registry
Signaling User Adaptation Layer Assignments
Simple Authentication and Security Layer (SASL) Mechanisms
RFC 4422
First Come First Served for mechanisms. Expert Review with mailing list for family name registrations. For names beginning with "GS2-", see RFC 5801. For names beginning with "SCRAM-", see RFC7677. Simon Josefsson
RFC 7677
IETF Review with mailing list
Simple Certificate Enrollment Protocol (SCEP)
RFC 8894
Specification Required Peter Gutmann
Simple Gateway Monitoring Protocol (SGMP) Vendor Specific Codes (Obsolete)
Simple Mail Transfer Protocol (SMTP) Enhanced Status Codes Registry
RFC 5248
Specification Required Chris Newman
RFC 5248
Specification Required Chris Newman
RFC 5248
Specification Required Chris Newman
Simple Network Management Protocol (SNMP) Number Spaces
RFC 3411
Standards Action
RFC 3411
Standards Action
RFC 3411, RFC 5343
1-127: Specification Required.
128-255: Enterprise-specific.
RFC 3411
Standards Action
Simple Two-way Active Measurement Protocol (STAMP)
RFC 9503
31-12: IETF Review.
11-8: First Come First Served.
7-4: Experimental Use.
3-0: Private Use.
RFC 9503
1-175: IETF Review.
176-239: First Come First Served.
240-251: Experimental Use.
252-254: Private Use.
RFC 8972
1-127: IETF Review.
128-239: First Come First Served.
240-249: Experimental Use.
250-254: Private Use.
RFC 8972
1-175: IETF Review.
176-239: First Come First Served.
240-251: Experimental Use.
252-254: Private Use.
RFC 8972
1-127: IETF Review.
128-239: First Come First Served.
240-249: Experimental Use.
250-254: Private Use.
RFC 8972
1-127: IETF Review.
128-239: First Come First Served.
240-249: Experimental Use.
250-254: Private Use.
RFC 8972
1-175: IETF Review.
176-239: First Come First Served.
240-251: Experimental Use.
252-254: Private Use.
SMTP MTA Strict Transport Security (MTA-STS)
Snoop Datalink Types
RFC 3827
0-26: Reserved.
27-4294967295: First Come First Served.
SOCKS Methods
Software ID Values
RFC 9393
0-127: Standards Action with Expert Review.
128-255: Specification Required.
Charles Schmidt Jessica Fitzgerald-McKay Henk Birkholz
RFC 9393
0-127: Standards Action with Expert Review.
128-255: Specification Required.
Charles Schmidt Jessica Fitzgerald-McKay Henk Birkholz
RFC 9393
0-32767: Standards Action with Expert Review.
32768-65535: Specification Required.
Charles Schmidt Jessica Fitzgerald-McKay Henk Birkholz
RFC 9393
0-127: Standards Action with Expert Review.
128-255: Specification Required.
Charles Schmidt Jessica Fitzgerald-McKay Henk Birkholz
RFC 9393
0-16383: Standards Action with Expert Review.
16384-65535: Specification Required.
Charles Schmidt Jessica Fitzgerald-McKay Henk Birkholz
Software Update for the Internet of Things (SUIT)
draft-ietf-suit-manifest-34
less than -255: Private Use.
-255 to 255: Standards Action.
greater than 255: Specification Required.
Brendan Moran Hannes Tschofenig
draft-ietf-suit-manifest-34
less than -255: Private Use.
-255 to 255: Standards Action.
greater than 255: Specification Required.
Brendan Moran Hannes Tschofenig
draft-ietf-suit-manifest-34
less than -255: Private Use.
-255 to 255: Standards Action.
greater than 255: Specification Required.
Brendan Moran Hannes Tschofenig
draft-ietf-suit-manifest-34
less than -255: Private Use.
-255 to 255: Standards Action.
greater than 255: Specification Required.
Brendan Moran Hannes Tschofenig
draft-ietf-suit-manifest-34
less than -255: Private Use.
-255 to 255: Standards Action.
greater than 255: Specification Required.
Brendan Moran Hannes Tschofenig
draft-ietf-suit-manifest-34
less than -255: Private Use.
-255 to 255: Standards Action.
greater than 255: Specification Required.
Brendan Moran Hannes Tschofenig
draft-ietf-suit-manifest-34
less than -255: Private Use.
-255 to 255: Standards Action.
greater than 255: Specification Required.
Brendan Moran Hannes Tschofenig
draft-ietf-suit-report-19
-4294967296 to -65537: First Come First Served.
-65536 to -257: Specification Required.
-256 to 255: Standards Action With Expert Review.
256 to 65535: Specification Required.
65536 to 4294967295: First Come First Served.
draft-ietf-suit-report-19
-4294967296 to -65537: First Come First Served.
-65536 to -257: Specification Required.
-256 to 255: Standards Action With Expert Review.
256 to 65535: Specification Required.
65536 to 4294967295: First Come First Served.
draft-ietf-suit-report-19
-4294967296 to -65537: First Come First Served.
-65536 to -257: Specification Required.
-256 to 255: Standards Action With Expert Review.
256 to 65535: Specification Required.
65536 to 4294967295: First Come First Served.
draft-ietf-suit-report-19
-4294967296 to -65537: First Come First Served.
-65536 to -257: Specification Required.
-256 to 255: Standards Action With Expert Review.
256 to 65535: Specification Required.
65536 to 4294967295: First Come First Served.
Special People Numbers Registry (SPNR)

Not an IETF Registry. Contact IANA
Special-Purpose Autonomous System (AS) Numbers
Special-Use Domain Names
RFC 6761
Standards Action or IESG Approval
STARTTLS Validation Result Types
RFC 8460
Expert Review Alexander Brotman Daniel Margolis Viktor Dukhovni
Straightforward-NAPTR (S-NAPTR) Parameters
RFC 3958, RFC 4848
Specification Required in form of an RFC Jouni Korhonen
RFC 3958, RFC 4848
Specification Required in form of an RFC Jouni Korhonen
Stream Control Transmission Protocol (SCTP) Parameters
RFC 9260
RFC Required
RFC 9260
IETF Review
RFC 9260
Specification Required Michael Tuexen Randall Stewart
RFC 9653
Specification Required Michael Tuexen Magnus Westerlund
Stringprep Profiles
Structure of Management Information (SMI) Numbers (MIB Module Registrations)
RFC 2506
Not Defined ?

Not Defined ?
RFC 3159
Standards Action
RFC 8411
Specification Required Russ Housley (primary) Sean Turner (secondary)
RFC 9456
Expert Review Russ Housley Sean Turner
RFC 4807
Specification Required Wes Hardaker
RFC 1213, RFC 8892
Specification Required Dave Thaler
RFC 4087, RFC 8675, RFC 8892
Expert Review Dave Thaler
Structured Data Exchange Format (SDXF)
Subsequent Address Family Identifiers (SAFI) Parameters
RFC 4760
1-63: Standards Action.
64-127: First Come First Served.
128-240: Some recognized assignments below, others Reserved.
241-254: Reserved for Private Use.
SUN Remote Procedure Call (RPC) Numbers - Obsolete
syslog Parameters
RFC 5424
Standards Action
System for Cross-domain Identity Management (SCIM) Schema URIs
RFC 9967
Expert Review Phil Hunt Paulo Jorge N. Correia Danny Zollner
RFC 7643
"core" and "API" schemas: RFC and Expert Review Required.
All other schemas: Expert Review.
Phil Hunt Paulo Jorge N. Correia
RFC 7643
"core" and "API" schemas: RFC and Expert Review Required.
All other schemas: Expert Review.
Phil Hunt Paulo Jorge N. Correia
TCP Convert Protocol (Convert) Parameters
RFC 8803
1-127: IETF Review.
128-191: Specification Required.
192-255: Private Use.
Mohamed Boucadair (primary) Olivier Bonaventure (secondary)
RFC 8803
1-127: IETF Review.
128-191: Specification Required.
192-255: Private Use.
Mohamed Boucadair (primary) Olivier Bonaventure (secondary)
Telephony Routing over IP (TRIP) Parameters
RFC 3219
Expert Review Jonathan Rosenberg
RFC 3219
Expert Review Jonathan Rosenberg
RFC 3219
Specification Required
RFC 3219
Specification Required
Telnet Options
RFC 855
IETF Review
Terminal Type Names
The Binary Floor Control Protocol (BFCP) Parameters
RFC 8855
Specification Required Brian Rosen Tom Kristensen
RFC 8855
Specification Required Brian Rosen Tom Kristensen
RFC 8855
Specification Required Brian Rosen Tom Kristensen
RFC 8855
Specification Required Brian Rosen Tom Kristensen
The Extensible Authentication Protocol Mechanism for the Generic Security Service Application Programming Interface (GSS-EAP) Parameters
RFC 7055
IETF Review or IESG Approval
RFC 7055
0-127: Standards Action.
128-255: Specification Required.
Joseph Salowey
RFC 7055
Expert Review Joseph Salowey
Time Zone Data Distribution Service (TZDIST) Parameters
RFC 7808
Specification Required Michael Douglass
Timed Efficient Stream Loss-tolerant Authentication (TESLA) Parameters
RFC 4442
Expert Review MSEC working group or its designated successor
RFC 4442
Expert Review MSEC working group or its designated successor
RFC 5776
Expert Review MSEC working group or its designated successor
RFC 5776
Expert Review MSEC working group or its designated successor
TLS-based Posture Transport Protocol (PT-TLS)
RFC 6876
Specification Required
RFC 6876
Specification Required
Token Binding Protocol
RFC 8471
Specification Required Andrei Popov Dirk Balfanz
RFC 8471
Specification Required Andrei Popov Dirk Balfanz
RFC 8471
Specification Required Andrei Popov Dirk Balfanz
Trailer Types
RFC 6081
Specification Required
Transfer Encodings
RFC 4289
Standards Action
Transmission Control Protocol (TCP) Header Flags
RFC 9293
Standards Action
Transmission Control Protocol (TCP) Parameters
RFC 5926
RFC Publication After Expert Review
RFC 8684
Specification Required
RFC 8684
Standards Action
RFC 8547
IETF Review or Expert Review with RFC Required
RFC 9293
Standards Action
RFC 2780
Standards Action or IESG Approval
RFC 8548
IETF Review or Expert Review with RFC Required
Transparent Interconnection of Lots of Links (TRILL) Parameters
RFC 7178
0x002-0x0FF: Standards Action.
0x100-0xFF7: RFC Required.
0x100-0xFF7: IESG Approval.
RFC 7357
IETF Review with additional requirements on the documentation of the use being registered as specified in Section 7.2 of RFC 7357.
RFC 8377
Ethertypes are assigned by the IEEE Registration Authority. Updates to this registry are coordinated with the designated expert. Donald Eastlake (primary) Sue Hares (secondary)
RFC 6325
RFC Required (single value) or IETF Review (single or multiple values)
RFC 7455
Standards Action
Transport Layer Security (TLS)
RFC 5878, RFC 8447, draft-ietf-tls-tls12-frozen-08, RFC 9847
0-63: IETF Review.
64-223: Specification Required.
224-255: Reserved for Private Use.
Yoav Nir Rich Salz Nick Sullivan
RFC 7924, draft-ietf-tls-tls12-frozen-08, RFC 9847
0-63: Standards Action.
64-223: Specification Required.
Yoav Nir Rich Salz Nick Sullivan
RFC 8879, draft-ietf-tls-tls12-frozen-08, RFC 9847
1-255: IETF Review.
256-16383: Specification Required.
16384-65535: Experimental Use.
Yoav Nir Rich Salz Nick Sullivan
RFC 6091, draft-ietf-tls-rfc8446bis-13, RFC 8447, draft-ietf-tls-tls12-frozen-08, RFC 9847
"Recommended" set to/transitioning from "Y" or "D": Either Standards Action With Expert Review or IESG Approval.
"Recommended" set to "N," not transitioning from another value: Specification Required.
Yoav Nir Rich Salz Nick Sullivan
draft-ietf-tls-rfc8446bis-13, RFC 8447, RFC 9147, draft-ietf-tls-tls12-frozen-08, RFC 9847
"Recommended" set to/transitioning from "Y" or "D": Either Standards Action With Expert Review or IESG Approval.
"Recommended" set to "N," not transitioning from another value: Specification Required.
Yoav Nir Rich Salz Nick Sullivan
RFC 5246, RFC 8447, draft-ietf-tls-tls12-frozen-08, RFC 9847
0-223 ("Recommended" set to/transitioning from "Y" or "D"): Either Standards Action with Expert Review or IESG Approval.
0-223 ("Recommended" set to "N," not transitioning from another value): Specification Required.
224-255: Reserved for Private Use.
Yoav Nir Rich Salz Nick Sullivan
RFC 3749, RFC 8447
0-63: Standards Action.
64-223: Specification Required.
224-255: Reserved for Private Use.
Yoav Nir Rich Salz Nick Sullivan
RFC 8422, draft-ietf-tls-tls12-frozen-08, RFC 9847
Specification Required Yoav Nir Rich Salz Nick Sullivan
RFC 8422, draft-ietf-tls-tls12-frozen-08, RFC 9847
Specification Required Yoav Nir Rich Salz Nick Sullivan
RFC 9849
Specification Required Rich Salz Nick Sullivan
RFC 5705, RFC 8447, RFC 9847
"Recommended" set to/transitioning from "Y" or "D": Either Standards Action With Expert Review or IESG Approval.
"Recommended" set to "N," not transitioning from another value: Expert Review.
Yoav Nir Rich Salz Nick Sullivan
draft-ietf-tls-rfc8446bis-13, RFC 8447, RFC 9146, draft-ietf-tls-tls12-frozen-08, RFC 9847
"Recommended" set to/transitioning from "Y" or "D": Either Standards Action With Expert Review or IESG Approval.
"Recommended" set to "N," not transitioning from another value: Specification Required.
Yoav Nir Rich Salz Nick Sullivan
RFC 5246, RFC 8447, RFC 9155, draft-ietf-tls-tls12-frozen-08, RFC 9847
0-223 ("Recommended" set to/transitioning from "Y" or "D"): Either Standards Action with Expert Review or IESG Approval.
0-223 ("Recommended" set to "N," not transitioning from another value): Specification Required.
224-255: Reserved for Private Use.
Yoav Nir Rich Salz Nick Sullivan
RFC 6520, RFC 8447, draft-ietf-tls-tls12-frozen-08, RFC 9847
Expert Review Yoav Nir Rich Salz Nick Sullivan
RFC 6520, RFC 8447, draft-ietf-tls-tls12-frozen-08, RFC 9847
Expert Review Yoav Nir Rich Salz Nick Sullivan
RFC 9258, draft-ietf-tls-tls12-frozen-08, RFC 9847
0x0000-0xfeff: Specification Required.
0xff00-0xffff: Private Use.
Rich Salz Nick Sullivan
draft-ietf-tls-rfc8446bis-13, draft-ietf-tls-tls12-frozen-08, RFC 9847
"Recommended" set to/transitioning from "Y" or "D": Either Standards Action With Expert Review or IESG Approval.
"Recommended" set to "N," not transitioning from another value: Specification Required.
Yoav Nir Rich Salz Nick Sullivan
RFC 9853
Expert Review Rich Salz Nick Sullivan Yoav Nir
RFC 5246, RFC 8447, RFC 9155, draft-ietf-tls-tls12-frozen-08, RFC 9847
0-223 ("Recommended" set to/transitioning from "Y" or "D"): Either Standards Action with Expert Review or IESG Approval.
0-223 ("Recommended" set to "N," not transitioning from another value): Specification Required.
224-255: Reserved for Private Use.
Yoav Nir Rich Salz Nick Sullivan
draft-ietf-tls-rfc8446bis-13, draft-ietf-tls-tls12-frozen-08, RFC 9847
"Recommended" set to/transitioning from "Y" or "D": Either Standards Action With Expert Review or IESG Approval.
"Recommended" set to "N," not transitioning from another value: Specification Required.
Yoav Nir Rich Salz Nick Sullivan
RFC 4680, RFC 8447, draft-ietf-tls-tls12-frozen-08, RFC 9847
0-16385: Standards Action.
16386-65279: IETF Review.
65280-65535: Reserved for Private Use.
RFC 8422, RFC 7919, draft-ietf-tls-rfc8446bis-13, RFC 8447, draft-ietf-tls-tls12-frozen-08, RFC 9847, draft-ietf-tls-hybrid-design-16
0-255 ("Recommended" set to/transitioning from "Y" or "D"): Either Standards Action with Expert Review or IESG Approval.
0-255 ("Recommended" set to "N," not transitioning from another value): Specification Required.
256-511 ("Recommended" set to/transitioning from "Y" or "D"): Either Standards Action with Expert Review or IESG Approval.
256-511 ("Recommended" set to "N," not transitioning from another value): Specification Required.
512-65535 ("Recommended" set to/transitioning from "Y" or "D"): Either Standards Action with Expert Review or IESG Approval.
512-65535 ("Recommended" set to "N," not transitioning from another value): Specification Required.
Yoav Nir Rich Salz Nick Sullivan
RFC 4681, draft-ietf-tls-tls12-frozen-08, RFC 9847
0-63: Standards Action.
64-223: Specification Required.
224-255: Reserved for Private Use.
Yoav Nir Rich Salz Nick Sullivan
Trusted Execution Environment Provisioning (TEEP)
draft-ietf-teep-protocol-26
0-255: Standards Action.
256-1023: Specification Required.
draft-ietf-teep-protocol-26
0-23: Standards Action.
24-254: Specification Required.
255: Private Use.
draft-ietf-teep-protocol-26
0-23: Standards Action.
24-255: Specification Required.
draft-ietf-teep-protocol-26
0-23: Standards Action.
24-255: Specification Required.
draft-ietf-teep-protocol-26
0-23: Standards Action.
24-255: Specification Required.
Tunnel Setup Protocol (TSP) Parameters
RFC 5572
First Come First Served
Two-way Active Measurement Protocol (TWAMP) Parameters
UDP Speed Test Protocol (UDPSTP)
RFC 9946
0x0000: Reserved.
0x0001-0x7F00: Specification Required.
0x7F01-0x7FE0: Experimental Use.
0x7FE1-0x7FFF: Private Use.
0x8000-0xFFFE: IETF Review.
0xFFFF: Reserved.
Ruediger Geib Len Ciavattone Xiao Min
RFC 9946
0-19: Reserved.
20-40960: IETF Review.
40961-53248: Specification Required.
53249-65534: Experimental Use.
65535: Reserved.
Ruediger Geib Len Ciavattone Xiao Min
RFC 9946
0-127: IETF Review.
128-239: Specification Required.
240-249: Experimental Use.
250-254: Private Use.
255: Reserved.
Ruediger Geib Len Ciavattone Xiao Min
RFC 9946
0-127: IETF Review.
128-239: Specification Required.
240-249: Experimental Use.
250-254: Private Use.
255: Reserved.
Ruediger Geib Len Ciavattone Xiao Min
RFC 9946
00000000-01111111: IETF Review.
10000000: Reserved.
RFC 9946
A-Y: IETF Review.
Z: Reserved.
RFC 9946
0-59: IETF Review.
60-63: Experimental Use.
64-255: Reserved.
RFC 9946
0-127: IETF Review.
128-239: Specification Required.
240-249: Experimental Use.
250-254: Private Use.
255: Reserved.
Ruediger Geib Len Ciavattone Xiao Min
RFC 9946
00000000-01111111: IETF Review.
10000000: Reserved.
Unidirectional Lightweight Encapsulation (ULE) Next-Header Registry
Uniform Resource Identifier (URI) Schemes
RFC 6694
First Come First Served
RFC 5870
IESG Approval with Specification Required
RFC 5870
Specification Required
RFC 9758
0-0xFFFF: Expert Review.
0x10000-0x3FFFFFFF: Expert Review.
0x40000000-0x7FFFFFFF: Experimental Use.
0x80000000-0xFFFFFFFF: Reserved.
>=0x100000000: Reserved.
Edward Birrane Rick Taylor
RFC 7116, RFC 9758
1-0x3FFF (1-16383): Private Use.
0x4000-0xFFFFFFFE (16384-4294967294): Expert Review.
>=0x100000000 (>=4294967296): Invalid.
Keith Scott
RFC 9758
1-127: Private Use.
128-255: Standards Action.
0x0100-0x7FFF: Private Use.
0x8000-0xFFFF: Specification Required.
0x10000-0xFFFFFFFF: Private Use.
>=0x100000000: Reserved for future expansion.
Edward Birrane Rick Taylor Brian Sipos
RFC 7711
Expert Review or IETF Review
RFC 5341
Specification Required Vijay Gurbani
RFC 7595, RFC 8615, draft-ietf-core-href-29
Permanent: Expert Review.
Provisional: First Come First Served.
Historical: Expert Review.
CRI Scheme Number field: 0-999: Expert Review.
CRI Scheme Number field: 1000-20000: First Come First Served.
Registry: Mark Baker (primary) Murray Kucherawy (backup) CRI Scheme Number field: Henk Birkholz Marco Tiloca
RFC 8615
Specification Required Mark Nottingham
Uniform Resource Name (URN) Namespace for IETF Use
Uniform Resource Names (URN)
RFC 7462
Specification Required Dale Worley
RFC 7462
First Come First Served
RFC 8141
Expert Review, per Section 6 of RFC 8141. Fast-track procedure for standards organizations described in Section 6.3. Peter Saint-Andre (team leader) Dale Worley Juha Hakala Stephanie Nitsche Lars Svensson
RFC 8141
Expert Review, per Section 6 of RFC 8141. Peter Saint-Andre (team leader) Dale Worley Juha Hakala Stephanie Nitsche
RFC 5031
Standards Action
User Datagram Protocol (UDP)
RFC 9868
Standards Action or IESG Approval
UUID
RFC 9562
Specification Required Kyzer Davis Brad Peabody
RFC 9562
Standards Action With Expert Review Kyzer Davis Brad Peabody
vCard Elements
RFC 6350
Expert Review and RFC Required Primary: Simon Perreault; Backup: Peter Saint-Andre
RFC 6350
No namespace specified: Expert Review and RFC Required.
Vendor namespace specified: First Come First Served.
Primary: Simon Perreault; Backup: Peter Saint-Andre
RFC 6350
No namespace specified: Expert Review and RFC Required.
Vendor namespace specified: First Come First Served.
Primary: Simon Perreault; Backup: Peter Saint-Andre
RFC 6350
Expert Review and RFC Required Primary: Simon Perreault; Backup: Peter Saint-Andre
RFC 6350
Expert Review and RFC Required Primary: Simon Perreault; Backup: Peter Saint-Andre
VCDIFF Secondary Compressor ID Values
RFC 3284
RFC or peer-reviewed permanent and readily available reference. Subject to the above, name assignments are First Come First Served.
Vectors of Trust (VoT)
RFC 8485
Specification Required Justin Richer Leif Johansson
'version' symbols used within the ISUP and QSIG
RFC 3204
Expert Review Jon Peterson
RFC 3204
Expert Review Jon Peterson
Virtual Network Computing (VNC) Uniform Resource Identifier (URI)
RFC 7869
First Come First Served
RFC 7869
First Come First Served
RFC 7869
First Come First Served
WAVE and AVI Codec Registries (Historic Registry)
RFC 2361
IANA does not assign. Republication of values.
Web Authentication (WebAuthn)
RFC 8809
Specification Required Mike Jones Giridhar Mandyam
RFC 8809
Specification Required Mike Jones Giridhar Mandyam
Web Push Parameters
RFC 8292
Specification Required Martin Thomson
Webfinger Parameters
WebRTC-HTTP Ingestion Protocol (WHIP)
RFC 9725
Specification Required Sergio Garcia Murillo Nils Ohlmeier
RFC 9725
Specification Required Sergio Garcia Murillo Nils Ohlmeier
WebSocket Protocol Registries
RFC 6455
1000-2999: Standards Action, Specification Required or IESG Review.
3000-3999: First Come First Served.
Alexey Melnikov
RFC 6455
Standard Version Numbers: IETF Review.
Interim Version Numbers: Expert Review.
HYBI WG Chairs
Wrapped Encapsulating Security Payload (WESP) Flags
RFC 5840
IETF Review
RFC 5840
Standards Action
X.25 Type Numbers

Not assigned by IANA
Xerox Network System (XNS) Protocol Types

Not assigned by IANA

Not assigned by IANA
XML Evidence Record Syntax (XMLERS)
XML Security URIs
RFC 9231
Specification Required Donald Eastlake Alexey Melnikov
YANG Geographic Location Parameters
RFC 9179
First Come First Served
YANG Module Tags
RFC 8819
Specification Required Christian Hopps Lou Berger
YANG Modules
RFC 9127, RFC 5880
See BFD Diagnostic Codes and BFD Authentication Types registries.
RFC 9291, RFC 6624
See BGP Layer 2 Encapsulation Types registry.
RFC 7317
Expert Review Kent Watsen
RFC 9108
See DNS CLASSes and Resource Record (RR) TYPEs registries.
RFC 9132
See the DOTS Status Codes, DOTS Conflict Status Codes, DOTS Conflict Cause Codes, and DOTS Attack Status Codes registries.
RFC 8348
See IANA-ENTITY-MIB MIB module.
draft-ietf-netconf-http-client-server-31
See the TLS Application-Layer Protocol Negotiation (ALPN) Protocol IDs registry.
RFC 9899
See ICMP Type Numbers registry.
RFC 9899
See ICMPv6 "type" Numbers registry.
RFC 1213, RFC 2863, RFC 7224, RFC 8892
This is one of the available formats of the Interface Types (ifType) registry.
RFC 9899
See IPv6 Extension Header Types registry.
RFC 9702
See the IGP MSD-Types registry.
draft-ietf-lsr-ospf-ls-link-infinity-25
New values must not be directly added to the "iana-ospf-functional-cap-bits" YANG module. They must instead be added to the "OSPF Router Functional Capability Bits" registry in the Open Shortest Path First (OSPF) Parameters registry group.
RFC 9291, RFC 4446
See MPLS Pseudowire Types registry.
RFC 8294, RFC 2453, RFC 2677, RFC 2858, RFC 4760
See Address Family Numbers and Subsequent Address Family Identifiers (SAFI) Values registries.
RFC 9644
See the Encryption Algorithm Names registry.
RFC 9644
See the Key Exchange Method Names registry.
RFC 9644
See the MAC Algorithm Names registry.
RFC 9644
See the Public Key Algorithm Names registry.
RFC 9645
See the TLS Cipher Suites registry.
RFC 4087, RFC 8675, RFC 8892
This is one of the available formats of the Tunnel Types (tunnelType) registry.
YANG Parameters
YANG SIDs
RFC 9595
Expert Review Michel Veillette Alexander Pelov Laurent Toutain
RFC 9595
0: IESG Approval.
1000: RFC Required (or Expert Review if YANG comes from existing RFC).
60000: Reserved for Experimental Use.
100000: RFC Required (or Expert Review if YANG comes from existing RFC).
300000: Reserved.
Michel Veillette Alexander Pelov Laurent Toutain
RFC 9595
Expert Review Michel Veillette Alexander Pelov Laurent Toutain