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) [RFC2460], 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].


Decimal Keyword Protocol IPv6 Extension Header Reference 

0 HOPOPT IPv6 Hop-by-Hop Option Y [RFC2460]
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 [RFC793]
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 ARGUS [Robert_W_Scheifler]
14 EMCON EMCON [<mystery contact>]
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][<mystery contact>]
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 IP with Encryption [John_Ioannidis]
54 NARP NBMA Address Resolution Protocol [RFC1735]
55 MOBILE IP Mobility [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 [RFC2460]
59 IPv6-NoNxt No Next Header for IPv6 [RFC2460]
60 IPv6-Opts Destination Options for IPv6 Y [RFC2460]
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 TTP Transaction Transport Protocol [Jim_Stevens]
84 IPTM Internet Protocol Traffic Manager [Jim_Stevens]
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 [Cisco Systems, "Gateway Server Reference Manual", Manual Revision B, January 10, 1988.][Guenther_Schreiner]
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 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 [RFC4601][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 [RFC5798]
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 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 [RFC5201]
140 Shim6 Shim6 Protocol Y [RFC5533]
141 WESP Wrapped Encapsulating Security Payload [RFC5840]
142 ROHC Robust Header Compression [RFC5858]
143-252 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]

Decimal	Keyword	Protocol	IPv6 Extension Header	Reference
0	HOPOPT	IPv6 Hop-by-Hop Option	Y	[RFC2460]
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		[RFC793]
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	ARGUS		[Robert_W_Scheifler]
14	EMCON	EMCON		[<mystery contact>]
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][<mystery contact>]
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	IP with Encryption		[John_Ioannidis]
54	NARP	NBMA Address Resolution Protocol		[RFC1735]
55	MOBILE	IP Mobility		[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		[RFC2460]
59	IPv6-NoNxt	No Next Header for IPv6		[RFC2460]
60	IPv6-Opts	Destination Options for IPv6	Y	[RFC2460]
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	TTP	Transaction Transport Protocol		[Jim_Stevens]
84	IPTM	Internet Protocol Traffic Manager		[Jim_Stevens]
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		[Cisco Systems, "Gateway Server Reference Manual", Manual Revision B, January 10, 1988.][Guenther_Schreiner]
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	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		[RFC4601][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		[RFC5798]
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	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	[RFC5201]
140	Shim6	Shim6 Protocol	Y	[RFC5533]
141	WESP	Wrapped Encapsulating Security Payload		[RFC5840]
142	ROHC	Robust Header Compression		[RFC5858]
143-252		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]