Library IP Protocol Numbers

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]
    12     PUP         PUP                             [PUP,XEROX]
    13     ARGUS       ARGUS                                [RWS4]
    14     EMCON       EMCON                                 [BN7]
    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]
    22     XNS-IDP     XEROX NS IDP               [ETHERNET,XEROX]
    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     DCCP        Datagram Congestion Control Protocol  [RFC-ietf-dccp-spec-11.txt]
    34     3PC         Third Party Connect Protocol         [SAF3]
    35     IDPR        Inter-Domain Policy Routing Protocol [MXS1] 
    36     XTP         XTP                                   [GXC]
    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         Encap Security Payload            [RFC2406]
    51     AH          Authentication Header             [RFC2402]
    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]
    62     CFTP        CFTP                            [CFTP,HCF2]
    63                 any local network                    [IANA]
    64     SAT-EXPAK   SATNET and Backroom EXPAK             [SHB]
    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]
    77     SUN-ND      SUN ND PROTOCOL-Temporary             [WM3]
    78     WB-MON      WIDEBAND Monitoring                   [SHB]
    79     WB-EXPAK    WIDEBAND EXPAK                        [SHB]
    80     ISO-IP      ISO Internet Protocol                 [MTR]
    81     VMTP        VMTP                                 [DRC3]
    82     SECURE-VMTP SECURE-VMTP                          [DRC3]
    83     VINES       VINES                                 [BXH]
    84     TTP         TTP                                   [JXS]
    85     NSFNET-IGP  NSFNET-IGP                            [HWB]
    86     DGP         Dissimilar Gateway Protocol     [DGP,ML109]
    87     TCF         TCF                                  [GAL5]
    88     EIGRP       EIGRP                           [CISCO,GXS]
    89     OSPFIGP     OSPFIGP                      [RFC1583,JTM4]
    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  [RFC3378]
    98     ENCAP       Encapsulation Header         [RFC1241,RXB3]
    99                 any private encryption scheme        [IANA]
   100     GMTP        GMTP                                 [RXB5]
   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 [RFC3768]
   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]
   134     RSVP-E2E-IGNORE                               [RFC3175]
   135     Mobility Header                               [RFC3775]
   136     UDPLite                                       [RFC3828]
   137     MPLS-in-IP                                    [RFC4023]
   138-252 Unassigned                                       [IANA]
   253     Use for experimentation and testing           [RFC3692] 
   254     Use for experimentation and testing           [RFC3692] 
   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.

[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.

[RFC2402] S. Kent and R. Atkinson, "IP Authentication Header", 
          RFC 2402, November 1998.

[RFC2406] S. Kent and R. Atkinson, "IP Encapsulating Security Payload (ESP)",
          RFC 2406, November 1998.

[RFC3175] F. Baker, C. Iturralde, F. Le Faucheur, B. Davie,
          "Aggregation of RSVP for IPv4 and IPv6 Reservations", 
          RFC 3175, September 2001.

[RFC3378] R. Housley and S. Hollenbeck, "EtherIP: Tunneling Ethernet 
          Frames in IP Datagrams", RFC 3378, September 2002.

[RFC3692] T. Narten, "Assigning Experimental and Testing Numbers Considered 
          Useful", RFC 3692, January 2004.

[RFC3768] R. Hinden, Ed., "Virtual Router Redundancy Protocol (VRRP)",
          RFC 3768, April 2004.

[RFC3775]  D. Johnson, C. Perkins, and J. Arkko, "Mobility Support in IPv6",
           RFC 3775, June 2004.

[RFC3828]  L-A. Larzon, M. Degermark, S. Pink, L-E. Jonsson Ed., and 
           G. Fairhurst, Ed., "The UDP-Lite Protocol", RFC 3828, July 2004.

[RFC4023]  T. Worster, Y. Rekhter, and E. Rosen, Ed., "Encapsulating MPLS in 
           IP or Generic Routing Encapsulation (GRE)", RFC 4023, March 2005.

           E. Kohler, M. Handley and S. Floyd, "Datagram Congestion 
           Control Protocol (DCCP)", RFC XXXX, Month Year.


[Aboba] Bernard Aboba , April 1998.

[Ballardie] Tony Ballardie 

[BCH2] Barry Howard  

[BK29] Brian Kantor  


[Braden] Bob Braden, ,, July 1997.

[BWB6] Barry Boehm  

[BXH] Brian Horn  <---none--->

[BXW] Bruce Willins <---none--->

[Callon] Ross Callon, , December 1995.

[Carpenter] Brian Carpenter, , January 1995.

[Crowcroft] Jon Crowcroft <[email protected]>, June 1999.

[DDC1] David Clark  

[DLM1] David Mills  

[DRC3] Dave Cheriton  

[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] 

[Ekblad] Leif Ekblad , March 1999.

[GAL5] Guillermo A. Loyola  

[GLENN]  K. Robert Glenn  <[email protected]>

[GXC] Greg Chesson  <[email protected]>

[GXS] Guenther Schreiner  

[GXT1] Gene Tsudik  

[Hamilton] Mark Hamilton , November 1998.

[HCF2] Harry Forsdick  

[Hinden] Bob Hinden, , November 1995, 1997.

[Hunter] Michael Hunter, , July 1997.

[HWB] Hans-Werner Braun  

[HXH] Howard Hart  

[IANA] Internet Assigned Numbers Authority, , June 1995.

[JBP]   Jon Postel 

[JMP] Jean-Michel Pittet, <[email protected]>, November 1998.


[JFH2] Jack Haverty <[email protected]>

[JI6] John Ioannidis  <[email protected]>

[JTM4] John Moy  <[email protected]>

[JWF] Jim Forgie  

[JXS] Jim Stevens  

[KATZ]  Dave Katz 

[Lee] CJ Lee, , October 1997.

[Lothberg] Peter Lothberg , March 1999.

[Markson] Tom Markson, , September 1995.

[MB] Mike Brescia  

[MBG] Michael Greenwald  <[email protected]>

[McIntosh] Bill McIntosh 

[ML109] Mike Little  

[MTR] Marshall T. Rose  

[Murphy] John Murphy <[email protected]>, October 1998.

[MXS1] Martha Steenstrup  

[NC3] J. Noel Chiappa  <[email protected]>

[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  

[RTB3]  Bob Braden 


[RDH1] Russ Housley  

[RWS4] Robert W. Scheifler  

[RXB3] Robert Woodburn <[email protected]>

[Sautter] Robert Sautter , August 1999.

[SAF3] Stuart A. Friedberg  

[SC3] Steve Casner  

[SHB] Steven Blumenthal  

[Speakman] Tony Speakman , January 1998.

[Sridhar] Manickam R.Sridhar , September 1997.

[Stewart] Randall R. Stewart , April 2000. 

[Sue Hares]  Sue Hares 

[SXA] Susie Armstrong  

[SXD] Steve Deering  

[Tony Li] Tony Li  

[TXM] Trudy Miller  

[Volpe] Victor Volpe , October 1997.

[VXD] Victor Dafoulas  <---none--->

[Waber] Kurt Waber , August 1999.

[Welzl] Michael Welzl  , August 1999.

[WM3] William Melohn  

[WXC] Wesley Craig   <[email protected]>

[Worley] John Worley <[email protected]>, June 1998.

[ZSU] Zaw-Sing Su  <[email protected]>