Internet Assigned Numbers Authority

Protocol Numbers

Last Updated
2024-12-06
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Registry included below

Assigned Internet Protocol Numbers

Registration Procedure(s)
IESG Approval or Standards Action
Reference
[RFC5237][RFC7045]
Note
In the Internet Protocol version 4 (IPv4) [RFC791] there is a field
called "Protocol" to identify the next level protocol.  This is an 8
bit field.  In Internet Protocol version 6 (IPv6) [RFC8200], this field 
is called the "Next Header" field.
Note
Values that are also IPv6 Extension Header Types should be listed in the 
IPv6 Extension Header Types registry at [IANA registry ipv6-parameters].
Available Formats

CSV
Decimal Keyword Protocol IPv6 Extension Header Reference
0 HOPOPT IPv6 Hop-by-Hop Option Y [RFC8200]
1 ICMP Internet Control Message [RFC792]
2 IGMP Internet Group Management [RFC1112]
3 GGP Gateway-to-Gateway [RFC823]
4 IPv4 IPv4 encapsulation [RFC2003]
5 ST Stream [RFC1190][RFC1819]
6 TCP Transmission Control [RFC9293]
7 CBT CBT [Tony_Ballardie]
8 EGP Exterior Gateway Protocol [RFC888][David_Mills]
9 IGP any private interior gateway (used by Cisco for their IGRP) [Internet_Assigned_Numbers_Authority]
10 BBN-RCC-MON BBN RCC Monitoring [Steve_Chipman]
11 NVP-II Network Voice Protocol [RFC741][Steve_Casner]
12 PUP PUP [Boggs, D., J. Shoch, E. Taft, and R. Metcalfe, "PUP: An Internetwork Architecture", XEROX Palo Alto Research Center, CSL-79-10, July 1979; also in IEEE Transactions on Communication, Volume COM-28, Number 4, April 1980.][[XEROX]]
13 ARGUS (deprecated) ARGUS [Robert_W_Scheifler]
14 EMCON EMCON [Bich_Nguyen]
15 XNET Cross Net Debugger [Haverty, J., "XNET Formats for Internet Protocol Version 4", IEN 158, October 1980.][Jack_Haverty]
16 CHAOS Chaos [J_Noel_Chiappa]
17 UDP User Datagram [RFC768][Jon_Postel]
18 MUX Multiplexing [Cohen, D. and J. Postel, "Multiplexing Protocol", IEN 90, USC/Information Sciences Institute, May 1979.][Jon_Postel]
19 DCN-MEAS DCN Measurement Subsystems [David_Mills]
20 HMP Host Monitoring [RFC869][Bob_Hinden]
21 PRM Packet Radio Measurement [Zaw_Sing_Su]
22 XNS-IDP XEROX NS IDP ["The Ethernet, A Local Area Network: Data Link Layer and Physical Layer Specification", AA-K759B-TK, Digital Equipment Corporation, Maynard, MA. Also as: "The Ethernet - A Local Area Network", Version 1.0, Digital Equipment Corporation, Intel Corporation, Xerox Corporation, September 1980. And: "The Ethernet, A Local Area Network: Data Link Layer and Physical Layer Specifications", Digital, Intel and Xerox, November 1982. And: XEROX, "The Ethernet, A Local Area Network: Data Link Layer and Physical Layer Specification", X3T51/80-50, Xerox Corporation, Stamford, CT., October 1980.][[XEROX]]
23 TRUNK-1 Trunk-1 [Barry_Boehm]
24 TRUNK-2 Trunk-2 [Barry_Boehm]
25 LEAF-1 Leaf-1 [Barry_Boehm]
26 LEAF-2 Leaf-2 [Barry_Boehm]
27 RDP Reliable Data Protocol [RFC908][Bob_Hinden]
28 IRTP Internet Reliable Transaction [RFC938][Trudy_Miller]
29 ISO-TP4 ISO Transport Protocol Class 4 [RFC905][Robert_Cole]
30 NETBLT Bulk Data Transfer Protocol [RFC969][David_Clark]
31 MFE-NSP MFE Network Services Protocol [Shuttleworth, B., "A Documentary of MFENet, a National Computer Network", UCRL-52317, Lawrence Livermore Labs, Livermore, California, June 1977.][Barry_Howard]
32 MERIT-INP MERIT Internodal Protocol [Hans_Werner_Braun]
33 DCCP Datagram Congestion Control Protocol [RFC4340]
34 3PC Third Party Connect Protocol [Stuart_A_Friedberg]
35 IDPR Inter-Domain Policy Routing Protocol [Martha_Steenstrup]
36 XTP XTP [Greg_Chesson]
37 DDP Datagram Delivery Protocol [Wesley_Craig]
38 IDPR-CMTP IDPR Control Message Transport Proto [Martha_Steenstrup]
39 TP++ TP++ Transport Protocol [Dirk_Fromhein]
40 IL IL Transport Protocol [Dave_Presotto]
41 IPv6 IPv6 encapsulation [RFC2473]
42 SDRP Source Demand Routing Protocol [Deborah_Estrin]
43 IPv6-Route Routing Header for IPv6 Y [Steve_Deering]
44 IPv6-Frag Fragment Header for IPv6 Y [Steve_Deering]
45 IDRP Inter-Domain Routing Protocol [Sue_Hares]
46 RSVP Reservation Protocol [RFC2205][RFC3209][Bob_Braden]
47 GRE Generic Routing Encapsulation [RFC2784][Tony_Li]
48 DSR Dynamic Source Routing Protocol [RFC4728]
49 BNA BNA [Gary Salamon]
50 ESP Encap Security Payload Y [RFC4303]
51 AH Authentication Header Y [RFC4302]
52 I-NLSP Integrated Net Layer Security TUBA [K_Robert_Glenn]
53 SWIPE (deprecated) IP with Encryption [John_Ioannidis]
54 NARP NBMA Address Resolution Protocol [RFC1735]
55 Min-IPv4 Minimal IPv4 Encapsulation [RFC2004][Charlie_Perkins]
56 TLSP Transport Layer Security Protocol using Kryptonet key management [Christer_Oberg]
57 SKIP SKIP [Tom_Markson]
58 IPv6-ICMP ICMP for IPv6 [RFC8200]
59 IPv6-NoNxt No Next Header for IPv6 [RFC8200]
60 IPv6-Opts Destination Options for IPv6 Y [RFC8200]
61 any host internal protocol [Internet_Assigned_Numbers_Authority]
62 CFTP CFTP [Forsdick, H., "CFTP", Network Message, Bolt Beranek and Newman, January 1982.][Harry_Forsdick]
63 any local network [Internet_Assigned_Numbers_Authority]
64 SAT-EXPAK SATNET and Backroom EXPAK [Steven_Blumenthal]
65 KRYPTOLAN Kryptolan [Paul Liu]
66 RVD MIT Remote Virtual Disk Protocol [Michael_Greenwald]
67 IPPC Internet Pluribus Packet Core [Steven_Blumenthal]
68 any distributed file system [Internet_Assigned_Numbers_Authority]
69 SAT-MON SATNET Monitoring [Steven_Blumenthal]
70 VISA VISA Protocol [Gene_Tsudik]
71 IPCV Internet Packet Core Utility [Steven_Blumenthal]
72 CPNX Computer Protocol Network Executive [David Mittnacht]
73 CPHB Computer Protocol Heart Beat [David Mittnacht]
74 WSN Wang Span Network [Victor Dafoulas]
75 PVP Packet Video Protocol [Steve_Casner]
76 BR-SAT-MON Backroom SATNET Monitoring [Steven_Blumenthal]
77 SUN-ND SUN ND PROTOCOL-Temporary [William_Melohn]
78 WB-MON WIDEBAND Monitoring [Steven_Blumenthal]
79 WB-EXPAK WIDEBAND EXPAK [Steven_Blumenthal]
80 ISO-IP ISO Internet Protocol [Marshall_T_Rose]
81 VMTP VMTP [Dave_Cheriton]
82 SECURE-VMTP SECURE-VMTP [Dave_Cheriton]
83 VINES VINES [Brian Horn]
84 IPTM Internet Protocol Traffic Manager [Jim_Stevens][1]
85 NSFNET-IGP NSFNET-IGP [Hans_Werner_Braun]
86 DGP Dissimilar Gateway Protocol [M/A-COM Government Systems, "Dissimilar Gateway Protocol Specification, Draft Version", Contract no. CS901145, November 16, 1987.][Mike_Little]
87 TCF TCF [Guillermo_A_Loyola]
88 EIGRP EIGRP [RFC7868]
89 OSPFIGP OSPFIGP [RFC1583][RFC2328][RFC5340][John_Moy]
90 Sprite-RPC Sprite RPC Protocol [Welch, B., "The Sprite Remote Procedure Call System", Technical Report, UCB/Computer Science Dept., 86/302, University of California at Berkeley, June 1986.][Bruce Willins]
91 LARP Locus Address Resolution Protocol [Brian Horn]
92 MTP Multicast Transport Protocol [Susie_Armstrong]
93 AX.25 AX.25 Frames [Brian_Kantor]
94 IPIP IP-within-IP Encapsulation Protocol [John_Ioannidis]
95 MICP (deprecated) Mobile Internetworking Control Pro. [John_Ioannidis]
96 SCC-SP Semaphore Communications Sec. Pro. [Howard_Hart]
97 ETHERIP Ethernet-within-IP Encapsulation [RFC3378]
98 ENCAP Encapsulation Header [RFC1241][Robert_Woodburn]
99 any private encryption scheme [Internet_Assigned_Numbers_Authority]
100 GMTP GMTP [[RXB5]]
101 IFMP Ipsilon Flow Management Protocol [Bob_Hinden][November 1995, 1997.]
102 PNNI PNNI over IP [Ross_Callon]
103 PIM Protocol Independent Multicast [RFC7761][Dino_Farinacci]
104 ARIS ARIS [Nancy_Feldman]
105 SCPS SCPS [Robert_Durst]
106 QNX QNX [Michael_Hunter]
107 A/N Active Networks [Bob_Braden]
108 IPComp IP Payload Compression Protocol [RFC2393]
109 SNP Sitara Networks Protocol [Manickam_R_Sridhar]
110 Compaq-Peer Compaq Peer Protocol [Victor_Volpe]
111 IPX-in-IP IPX in IP [CJ_Lee]
112 VRRP Virtual Router Redundancy Protocol [RFC9568]
113 PGM PGM Reliable Transport Protocol [Tony_Speakman]
114 any 0-hop protocol [Internet_Assigned_Numbers_Authority]
115 L2TP Layer Two Tunneling Protocol [RFC3931][Bernard_Aboba]
116 DDX D-II Data Exchange (DDX) [John_Worley]
117 IATP Interactive Agent Transfer Protocol [John_Murphy]
118 STP Schedule Transfer Protocol [Jean_Michel_Pittet]
119 SRP SpectraLink Radio Protocol [Mark_Hamilton]
120 UTI UTI [Peter_Lothberg]
121 SMP Simple Message Protocol [Leif_Ekblad]
122 SM (deprecated) Simple Multicast Protocol [Jon_Crowcroft][draft-perlman-simple-multicast-03]
123 PTP Performance Transparency Protocol [Michael_Welzl]
124 ISIS over IPv4 [Tony_Przygienda]
125 FIRE [Criag_Partridge]
126 CRTP Combat Radio Transport Protocol [Robert_Sautter]
127 CRUDP Combat Radio User Datagram [Robert_Sautter]
128 SSCOPMCE [Kurt_Waber]
129 IPLT [[Hollbach]]
130 SPS Secure Packet Shield [Bill_McIntosh]
131 PIPE Private IP Encapsulation within IP [Bernhard_Petri]
132 SCTP Stream Control Transmission Protocol [Randall_R_Stewart]
133 FC Fibre Channel [Murali_Rajagopal][RFC6172]
134 RSVP-E2E-IGNORE [RFC3175]
135 Mobility Header Y [RFC6275]
136 UDPLite [RFC3828]
137 MPLS-in-IP [RFC4023]
138 manet MANET Protocols [RFC5498]
139 HIP Host Identity Protocol Y [RFC7401]
140 Shim6 Shim6 Protocol Y [RFC5533]
141 WESP Wrapped Encapsulating Security Payload [RFC5840]
142 ROHC Robust Header Compression [RFC5858]
143 Ethernet Ethernet [RFC8986]
144 AGGFRAG AGGFRAG encapsulation payload for ESP [RFC9347]
145 NSH Network Service Header N [RFC9491]
146 Homa Homa N [HomaModule][John_Ousterhout]
147-252 Unassigned [Internet_Assigned_Numbers_Authority]
253 Use for experimentation and testing Y [RFC3692]
254 Use for experimentation and testing Y [RFC3692]
255 Reserved [Internet_Assigned_Numbers_Authority]

Contact Information

ID Name Contact URI Last Updated
[Barry_Boehm] Barry Boehm mailto:boehm&arpa.mil
[Barry_Howard] Barry Howard mailto:Howard&nmfecc.llnl.gov
[Bernard_Aboba] Bernard Aboba mailto:bernarda&microsoft.com 1998-04
[Bernhard_Petri] Bernhard Petri mailto:bernhard.petri&siemens.com 2012-07-09
[Bich_Nguyen] Bich Nguyen mailto:bitnguyen&gmail.com 2023-01-09
[Bill_McIntosh] Bill McIntosh mailto:BMcIntosh&fortresstech.com
[Bob_Braden] Bob Braden mailto:braden&isi.edu 1997-07
[Bob_Hinden] Bob Hinden mailto:bob.hinden&gmail.com 2013-02-17
[Brian_Kantor] Brian Kantor mailto:brian&ucsd.edu
[CJ_Lee] CJ Lee mailto:cj_lee&novell.com 1997-10
[Charlie_Perkins] Charlie Perkins mailto:perk&watson.ibm.com 1994-10
[Christer_Oberg] Christer Oberg mailto:chg&bull.se 1994-10
[Criag_Partridge] Criag Partridge mailto:craig&bbn.com 1999-08
[Dave_Cheriton] Dave Cheriton mailto:cheriton&pescadero.stanford.edu
[Dave_Presotto] Dave Presotto mailto:presotto&plan9.att.com 1995-07
[David_Clark] David Clark mailto:ddc&lcs.mit.edu
[David_Mills] David Mills mailto:Mills&huey.udel.edu
[Deborah_Estrin] Deborah Estrin mailto:estrin&usc.edu
[Dino_Farinacci] Dino Farinacci mailto:dino&cisco.com 1996-03
[Dirk_Fromhein] Dirk Fromhein mailto:df&watershed.com
[Gene_Tsudik] Gene Tsudik mailto:tsudik&usc.edu
[Greg_Chesson] Greg Chesson mailto:Greg&sgi.com
[Guillermo_A_Loyola] Guillermo A. Loyola mailto:LOYOLA&ibm.com
[Hans_Werner_Braun] Hans-Werner Braun mailto:HWB&mcr.umich.edu
[Harry_Forsdick] Harry Forsdick mailto:Forsdick&bbn.com
[Howard_Hart] Howard Hart mailto:hch&hybrid.com
[Internet_Assigned_Numbers_Authority] Internet Assigned Numbers Authority mailto:iana&iana.org 1995-06
[J_Noel_Chiappa] J. Noel Chiappa mailto:JNC&xx.lcs.mit.edu
[Jack_Haverty] Jack Haverty mailto:jhaverty&oracle.com
[Jean_Michel_Pittet] Jean-Michel Pittet mailto:jmp&gandalf.engr.sgi.com 1998-11
[Jim_Stevens] Jim Stevens mailto:jasteven&rockwellcollins.com 2011-01-26
[John_Ioannidis] John Ioannidis mailto:ji&tla.org 2015-01-06
[John_Moy] John Moy mailto:jmoy&proteon.com
[John_Murphy] John Murphy mailto:john.m.murphy&mci.com 1998-10
[John_Ousterhout] John Ousterhout mailto:john.ousterhout&gmail.com 2024-10-24
[John_Worley] John Worley mailto:worley&milehigh.net 1998-06
[Jon_Crowcroft] Jon Crowcroft mailto:jon&cs.ucl.ac.uk 1999-06
[Jon_Postel] Jon Postel mailto:postel&isi.edu
[K_Robert_Glenn] K. Robert Glenn mailto:glenn&osi.ncsl.nist.gov
[Kurt_Waber] Kurt Waber mailto:kurt.waber&swisscom.com 1999-08
[Leif_Ekblad] Leif Ekblad mailto:leif&rdos.net 2012-08-21
[Manickam_R_Sridhar] Manickam R. Sridhar mailto:msridhar&sitaranetworks.com 1997-09
[Mark_Hamilton] Mark Hamilton mailto:mah&spectralink.com 1998-11
[Marshall_T_Rose] Marshall T. Rose mailto:mrose&dbc.mtview.ca.us
[Martha_Steenstrup] Martha Steenstrup mailto:MSteenst&bbn.com
[Michael_Greenwald] Michael Greenwald mailto:Greenwald&scrc-stony-brook.symbolics.com
[Michael_Hunter] Michael Hunter mailto:mphunter&qnx.com 1997-07
[Michael_Welzl] Michael Welzl mailto:michael&tk.uni-linz.ac.at 1999-08
[Mike_Little] Mike Little mailto:little&macom4.arpa
[Murali_Rajagopal] Murali Rajagopal mailto:murali&gadzoox.com 2000-05
[Nancy_Feldman] Nancy Feldman mailto:nkf&vnet.ibm.com 1997-01
[Peter_Lothberg] Peter Lothberg mailto:roll&stupi.se 1999-03
[Randall_R_Stewart] Randall R. Stewart mailto:rrs&lakerest.net 2000-04
[Robert_Cole] Robert Cole mailto:robert&CS.UCL.AC.UK
[Robert_Durst] Robert Durst mailto:durst&mitre.org 1997-03
[Robert_Sautter] Robert Sautter mailto:rsautter&acdnj.itt.com 1999-08
[Robert_W_Scheifler] Robert W. Scheifler mailto:rscheifler&comcast.net 2015-10-06
[Robert_Woodburn] Robert Woodburn mailto:woody&cseic.saic.com
[Ross_Callon] Ross Callon mailto:rcallon&baynetworks.com 1995-12
[Steve_Casner] Steve Casner mailto:casner&isi.edu
[Steve_Chipman] Steve Chipman mailto:Chipman&f.bbn.com
[Steve_Deering] Steve Deering mailto:deering&parc.xerox.com 1995-03
[Steven_Blumenthal] Steven Blumenthal mailto:BLUMENTHAL&vax.bbn.com
[Stuart_A_Friedberg] Stuart A. Friedberg mailto:stuart&cs.wisc.edu
[Sue_Hares] Sue Hares mailto:skh&merit.edu
[Susie_Armstrong] Susie Armstrong mailto:Armstrong.wbst128&xerox.com
[Tom_Markson] Tom Markson mailto:markson&osmosys.ingog.com 1995-09
[Tony_Ballardie] Tony Ballardie mailto:A.Ballardie&cs.ucl.ac.uk
[Tony_Li] Tony Li mailto:tony.li&tony.li 2012-10-17
[Tony_Przygienda] Tony Przygienda mailto:prz&siara.com 1999-08
[Tony_Speakman] Tony Speakman mailto:speakman&cisco.com 1998-01
[Trudy_Miller] Trudy Miller mailto:Trudy&acc.com
[Victor_Volpe] Victor Volpe mailto:vvolpe&smtp.microcom.com 1997-10
[Wesley_Craig] Wesley Craig mailto:Wesley.Craig&terminator.cc.umich.edu
[William_Melohn] William Melohn mailto:Melohn&sun.com
[Zaw_Sing_Su] Zaw-Sing Su mailto:ZSu&tsca.istc.sri.

Footnote

[1] 
Until March 2023, value 84 was also assigned to TTP (Transaction Transport Protocol).