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(last updated 2001 December 18)
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) [RFC1883] this field
is called the "Next Header" field.
Assigned Internet Protocol Numbers
Decimal Keyword Protocol References
------- ------- -------- ----------
0 HOPOPT IPv6 Hop-by-Hop Option [RFC1883]
1 ICMP Internet Control Message [RFC792]
2 IGMP Internet Group Management [RFC1112]
3 GGP Gateway-to-Gateway [RFC823]
4 IP IP in IP (encapsulation) [RFC2003]
5 ST Stream [RFC1190,RFC1819]
6 TCP Transmission Control [RFC793]
7 CBT CBT [Ballardie]
8 EGP Exterior Gateway Protocol [RFC888,DLM1]
9 IGP any private interior gateway [IANA]
(used by Cisco for their IGRP)
10 BBN-RCC-MON BBN RCC Monitoring [SGC]
11 NVP-II Network Voice Protocol [RFC741,SC3]
15 XNET Cross Net Debugger [IEN158,JFH2]
16 CHAOS Chaos [NC3]
17 UDP User Datagram [RFC768,JBP]
18 MUX Multiplexing [IEN90,JBP]
19 DCN-MEAS DCN Measurement Subsystems [DLM1]
20 HMP Host Monitoring [RFC869,RH6]
21 PRM Packet Radio Measurement [ZSU]
23 TRUNK-1 Trunk-1 [BWB6]
24 TRUNK-2 Trunk-2 [BWB6]
25 LEAF-1 Leaf-1 [BWB6]
26 LEAF-2 Leaf-2 [BWB6]
27 RDP Reliable Data Protocol [RFC908,RH6]
28 IRTP Internet Reliable Transaction [RFC938,TXM]
29 ISO-TP4 ISO Transport Protocol Class 4 [RFC905,RC77]
30 NETBLT Bulk Data Transfer Protocol [RFC969,DDC1]
31 MFE-NSP MFE Network Services Protocol [MFENET,BCH2]
32 MERIT-INP MERIT Internodal Protocol [HWB]
33 SEP Sequential Exchange Protocol [JC120]
34 3PC Third Party Connect Protocol [SAF3]
35 IDPR Inter-Domain Policy Routing Protocol [MXS1]
37 DDP Datagram Delivery Protocol [WXC]
38 IDPR-CMTP IDPR Control Message Transport Proto [MXS1]
39 TP++ TP++ Transport Protocol [DXF]
40 IL IL Transport Protocol [Presotto]
41 IPv6 Ipv6 [Deering]
42 SDRP Source Demand Routing Protocol [DXE1]
43 IPv6-Route Routing Header for IPv6 [Deering]
44 IPv6-Frag Fragment Header for IPv6 [Deering]
45 IDRP Inter-Domain Routing Protocol [Sue Hares]
46 RSVP Reservation Protocol [Bob Braden]
47 GRE General Routing Encapsulation [Tony Li]
48 MHRP Mobile Host Routing Protocol[David Johnson]
49 BNA BNA [Gary Salamon]
50 ESP Encapsulating Security Payload [RFC1827]
51 AH Authentication Header [RFC1826]
52 I-NLSP Integrated Net Layer Security TUBA [GLENN]
53 SWIPE IP with Encryption [JI6]
54 NARP NBMA Address Resolution Protocol [RFC1735]
55 MOBILE IP Mobility [Perkins]
56 TLSP Transport Layer Security Protocol [Oberg]
using Kryptonet key management
57 SKIP SKIP [Markson]
58 IPv6-ICMP ICMP for IPv6 [RFC1883]
59 IPv6-NoNxt No Next Header for IPv6 [RFC1883]
60 IPv6-Opts Destination Options for IPv6 [RFC1883]
61 any host internal protocol [IANA]
63 any local network [IANA]
65 KRYPTOLAN Kryptolan [PXL1]
66 RVD MIT Remote Virtual Disk Protocol [MBG]
67 IPPC Internet Pluribus Packet Core [SHB]
68 any distributed file system [IANA]
69 SAT-MON SATNET Monitoring [SHB]
70 VISA VISA Protocol [GXT1]
71 IPCV Internet Packet Core Utility [SHB]
72 CPNX Computer Protocol Network Executive [DXM2]
73 CPHB Computer Protocol Heart Beat [DXM2]
74 WSN Wang Span Network [VXD]
75 PVP Packet Video Protocol [SC3]
76 BR-SAT-MON Backroom SATNET Monitoring [SHB]
78 WB-MON WIDEBAND Monitoring [SHB]
80 ISO-IP ISO Internet Protocol [MTR]
86 DGP Dissimilar Gateway Protocol [DGP,ML109]
90 Sprite-RPC Sprite RPC Protocol [SPRITE,BXW]
91 LARP Locus Address Resolution Protocol [BXH]
92 MTP Multicast Transport Protocol [SXA]
93 AX.25 AX.25 Frames [BK29]
94 IPIP IP-within-IP Encapsulation Protocol [JI6]
95 MICP Mobile Internetworking Control Pro. [JI6]
96 SCC-SP Semaphore Communications Sec. Pro. [HXH]
97 ETHERIP Ethernet-within-IP Encapsulation [RDH1]
98 ENCAP Encapsulation Header [RFC1241,RXB3]
99 any private encryption scheme [IANA]
101 IFMP Ipsilon Flow Management Protocol [Hinden]
102 PNNI PNNI over IP [Callon]
103 PIM Protocol Independent Multicast [Farinacci]
104 ARIS ARIS [Feldman]
105 SCPS SCPS [Durst]
106 QNX QNX [Hunter]
107 A/N Active Networks [Braden]
108 IPComp IP Payload Compression Protocol [RFC2393]
109 SNP Sitara Networks Protocol [Sridhar]
110 Compaq-Peer Compaq Peer Protocol [Volpe]
111 IPX-in-IP IPX in IP [Lee]
112 VRRP Virtual Router Redundancy Protocol [Hinden]
113 PGM PGM Reliable Transport Protocol [Speakman]
114 any 0-hop protocol [IANA]
115 L2TP Layer Two Tunneling Protocol [Aboba]
116 DDX D-II Data Exchange (DDX) [Worley]
117 IATP Interactive Agent Transfer Protocol [Murphy]
118 STP Schedule Transfer Protocol [JMP]
119 SRP SpectraLink Radio Protocol [Hamilton]
120 UTI UTI [Lothberg]
121 SMP Simple Message Protocol [Ekblad]
122 SM SM [Crowcroft]
123 PTP Performance Transparency Protocol [Welzl]
124 ISIS over IPv4 [Przygienda]
125 FIRE [Partridge]
126 CRTP Combat Radio Transport Protocol [Sautter]
127 CRUDP Combat Radio User Datagram [Sautter]
128 SSCOPMCE [Waber]
129 IPLT [Hollbach]
130 SPS Secure Packet Shield [McIntosh]
131 PIPE Private IP Encapsulation within IP [Petri]
132 SCTP Stream Control Transmission Protocol [Stewart]
133 FC Fibre Channel [Rajagopal]
135-254 Unassigned [IANA]
255 Reserved [IANA]
[CFTP] Forsdick, H., "CFTP", Network Message, Bolt Beranek and
Newman, January 1982.
[CISCO] Cisco Systems, "Gateway Server Reference Manual", Manual
Revision B, January 10, 1988.
[DDN] Feinler, E., Editor, "DDN Protocol Handbook", Network
Information Center, SRI International, December 1985.
[DGP] M/A-COM Government Systems, "Dissimilar Gateway Protocol
Specification, Draft Version", Contract no. CS901145,
November 16, 1987.
[ETHERNET] "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.
[IEN90] Cohen, D. and J. Postel, "Multiplexing Protocol", IEN 90,
USC/Information Sciences Institute, May 1979.
[IEN119] Forgie, J., "ST - A Proposed Internet Stream Protocol",
IEN 119, MIT Lincoln Laboratory, September 1979.
[IEN158] Haverty, J., "XNET Formats for Internet Protocol Version 4",
IEN 158, October 1980.
[MFENET] Shuttleworth, B., "A Documentary of MFENet, a National
Computer Network", UCRL-52317, Lawrence Livermore Labs,
Livermore, California, June 1977.
[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.
[SPRITE] Welch, B., "The Sprite Remote Procedure Call System",
Technical Report, UCB/Computer Science Dept., 86/302,
University of California at Berkeley, June 1986.
[RFC741] Cohen, D., "Specifications for the Network Voice Protocol",
RFC 741, ISI/RR 7539, USC/Information Sciences Institute,
March 1976.
[RFC768] Postel, J., "User Datagram Protocol", STD 6, RFC 768,
USC/Information Sciences Institute, August 1980.
[RFC791] Postel, J., "Internet Protocol - DARPA Internet Prnogram
Protocol Specification", STD 5, RFC 791, DARPA, September
[RFC792] Postel, J., "Internet Control Message Protocol - DARPA
Internet Program Protocol Specification", STD 5, RFC 792,
USC/Information Sciences Institute, September 1981.
[RFC793] Postel, J., "Transmission Control Protocol - DARPA
Internet Program Protocol Specification", STD 7, RFC 793,
USC/Information Sciences Institute, September 1981.
[RFC823] Hinden, R., and A. Sheltzer, "The DARPA Internet Gateway",
RFC 823, BBN, September 1982.
[RFC869] Hinden, R., "A Host Monitoring Protocol", RFC 869,
Bolt Beranek and Newman, December 1983.
[RFC888] Seamonson, L., and E. Rosen, "STUB" Exterior Gateway
Protocol", RFC 888, BBN Communications Corporation,
January 1984.
[RFC905] International Standards Organization, "ISO Transport Protocol
Specification - ISO DP 8073", RFC 905, April 1984.
[RFC908] Velten, D., R. Hinden, and J. Sax, "Reliable Data Protocol",
RFC 908, BBN Communications Corporation, July 1984.
[RFC938] Miller, T., "Internet Reliable Transaction Protocol", RFC 938,
ACC, February 1985.
[RFC969] Clark, D., M. Lambert, and L. Zhang, "NETBLT: A Bulk Data
Transfer Protocol", RFC 969, MIT Laboratory for Computer
Science, December 1985.
[RFC1112] Deering, S., "Host Extensions for IP Multicasting",
STD 5, RFC 1112, Stanford University, August 1989.
[RFC1190] Topolcic, C., Editor, "Experimental Internet Stream
Protocol, Version 2 (ST-II)", RFC 1190, CIP Working Group,
October 1990.
[RFC1241] Woodburn, W., and D. Mills, " A Scheme for an Internet
Encapsulation Protocol: Version 1", RFC 1241, SAIC,
University of Delaware, July 1991.
[RFC1583] Moy, J., "The OSPF Specification", RFC 1583, Proteon,
March 1994.
[RFC1735] Heinanen, J., and R. Govindan, " NBMA Address Resolution
Protocol (NARP)", RFC 1735, Telecom Finland and USC/ISI,
December 1994.
[RFC1819] L. Delgrossi, L. Berger, and ST2 Working Group, "Internet
Stream Protocol Version 2 (ST2) Protocol Specification
- Version ST2+", RFC 1819, August 1995.
[RFC1826] Atkinson, R., "IP Authentication Header", RFC 1826, Naval
Research Laboratory, August 1995.
[RFC1827] Atkinson, R., "IP Encapsulating Security Payload (ESP)", RFC
1827, Naval Research Laboratory, August 1995.
[RFC1883] Deering, S., and R. Hinden, "Internet Protocol, Version 6
(IPv6) Specification", RFC 1883, Xerox PARC, Ipsilon
Networks, December 1995.
[RFC2003] Perkins, C., "IP Encapsulation within IP", RFC 2003, IBM,
September 1996.
[RFC2393] Shacham, A., and R. Monsour, R. Pereira, M. Thomas, "IP
Payload Compression Protocol (IPComp)", RFC 2393, Cisco,
Hi/fn, TimeStep, AltaVista Internt, December 1998.
[RFC3175] F. Baker, C. Iturralde, F. Le Faucheur, B. Davie,
"Aggregation of RSVP for IPv4 and IPv6 Reservations",
RFC 3175, September 2001.
[Aboba] Bernard Aboba <>, April 1998.
[Ballardie] Tony Ballardie <>
[BCH2] Barry Howard <Howard@NMFECC.LLNL.GOV>
[BK29] Brian Kantor <brian@UCSD.EDU>
[BN7] <mystery contact>
[Braden] Bob Braden, <>,, July 1997.
[BWB6] Barry Boehm <boehm@ARPA.MIL>
[BXH] Brian Horn <---none--->
[BXW] Bruce Willins <---none--->
[Callon] Ross Callon, <>, December 1995.
[Carpenter] Brian Carpenter, <>, January 1995.
[Crowcroft] Jon Crowcroft <>, June 1999.
[DDC1] David Clark <ddc@LCS.MIT.EDU>
[DLM1] David Mills <Mills@HUEY.UDEL.EDU>
[DRC3] Dave Cheriton <cheriton@PESCADERO.STANFORD.EDU>
[Deering] Steve Deering, <>, March 1995.
[Doraswamy] Naganand Doraswamy, <>, September 1997.
[Durst] Robert Durst, <>, March 1997.
[DXE1] Deborah Estrin <>
[Farinacci] Dino Farinacci, <>, March 1996.
[Feldman] Nancy Feldman <> January 1997.
[DXF] Dirk Fromhein <>
[DXM2] David Mittnacht <---none--->
[David Johnson] <mystery contact>
[Ekblad] Leif Ekblad <>, March 1999.
[GAL5] Guillermo A. Loyola <LOYOLA@IBM.COM>
[GLENN] K. Robert Glenn <>
[GXC] Greg Chesson <Greg@SGI.COM>
[GXS] Guenther Schreiner <>
[GXT1] Gene Tsudik <tsudik@USC.EDU>
[Hamilton] Mark Hamilton <>, November 1998.
[HCF2] Harry Forsdick <Forsdick@BBN.COM>
[Hinden] Bob Hinden, <>, November 1995, 1997.
[Hunter] Michael Hunter, <>, July 1997.
[HWB] Hans-Werner Braun <HWB@MCR.UMICH.EDU>
[HXH] Howard Hart <>
[IANA] Internet Assigned Numbers Authority, <>, June 1995.
[JBP] Jon Postel <>
[JMP] Jean-Michel Pittet, <>, November 1998.
[JC120] <mystery contact>
[JFH2] Jack Haverty <jhaverty@ORACLE.COM>
[JI6] John Ioannidis <ji@CS.COLUMBIA.EDU>
[JTM4] John Moy <jmoy@PROTEON.COM>
[JXS] Jim Stevens <Stevens@ISI.EDU>
[KATZ] Dave Katz <>
[Lee] CJ Lee, <>, October 1997.
[Lothberg] Peter Lothberg <>, March 1999.
[Markson] Tom Markson, <>, September 1995.
[MB] Mike Brescia <Brescia@CCV.BBN.COM>
[MBG] Michael Greenwald <Greenwald@SCRC-STONY-BROOK.SYMBOLICS.COM>
[McIntosh] Bill McIntosh <>
[ML109] Mike Little <little@MACOM4.ARPA>
[MTR] Marshall T. Rose <>
[Murphy] John Murphy <>, October 1998.
[MXS1] Martha Steenstrup <MSteenst@BBN.COM>
[NC3] J. Noel Chiappa <JNC@XX.LCS.MIT.EDU>
[Oberg] Christer Oberg <> October 1994.
[Partridge] Criag Partridge <>, August 1999.
[Perkins] Charlie Perkins <>, October 1994.
[Petri] Bernhard Petri <>, March 2000
[Presotto] Dave Presotto <>, July 1995.
[Przygienda] Tony Przygienda <>, August 1999.
[PXL1] Paul Liu <---none--->
[Rajagopal] Murali Rajagopal, <>, May 2000.
[RH6] Robert Hinden <Hinden@ENG.SUN.COM>
[RTB3] Bob Braden <>
[RC77] <mystery contact>
[RDH1] Russ Housley <>
[RWS4] Robert W. Scheifler <RWS@XX.LCS.MIT.EDU>
[RXB3] Robert Woodburn <>
[Sautter] Robert Sautter <>, August 1999.
[SAF3] Stuart A. Friedberg <stuart@CS.WISC.EDU>
[SC3] Steve Casner <
[SGC] Steve Chipman <Chipman@F.BBN.COM>
[SHB] Steven Blumenthal <BLUMENTHAL@VAX.BBN.COM>
[Speakman] Tony Speakman <>, January 1998.
[Sridhar] Manickam R.Sridhar <>, September 1997.
[Stewart] Randall R. Stewart <>, April 2000.
[Sue Hares] Sue Hares <>
[SXA] Susie Armstrong <Armstrong.wbst128@XEROX.COM>
[SXD] Steve Deering <deering@PARC.XEROX.COM>
[Tony Li] Tony Li <>
[TXM] Trudy Miller <Trudy@ACC.COM>
[Volpe] Victor Volpe <>, October 1997.
[VXD] Victor Dafoulas <---none--->
[Waber] Kurt Waber <>, August 1999.
[Welzl] Michael Welzl <>, August 1999.
[WM3] William Melohn <Melohn@SUN.COM>
[WXC] Wesley Craig <>
[Worley] John Worley <>, June 1998.
[ZSU] Zaw-Sing Su <ZSu@TSCA.ISTC.SRI.>