PROTOCOL NUMBERS

(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]
    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     SEP         Sequential Exchange Protocol        [JC120]
    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         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]
    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     [RDH1]
    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 [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]
   134     RSVP-E2E-IGNORE                               [RFC3175]
   135-254             Unassigned                           [IANA]
   255                 Reserved                             [IANA]


REFERENCES

[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
         1981.

[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