Protocol Numbers

Last Updated: 2024-10-24
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Registry included below

Assigned Internet Protocol Numbers

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]
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).