Appendix C: IP Protocol Numbers
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Within the IP header there is an 8-bit field that identifies the next higher-level protocol (in IPv4 this field is called Protocol, in IPv6 it is called Next Header). The following list of IP protocol identifiers comprises information from various sources, including RFC 1700 and some personal observations. Any errors or omissions are therefore my own. The list provided here is not exhaustive. For a complete up-to-date list of port assignments see the IANA URL below:
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URL = ftp://ftp.isi.edu/in-notes/iana/assignments/protocol-numbers
C.1 IP Protocol Assignments
| Decimal | Keyword | Protocol |
|---|---|---|
| 0 | — | Reserved |
| 1 | ICMP | Internet Control Message |
| 2 | IGMP | Internet Group Management |
| 3 | GGP | Gateway-to-Gateway |
| 4 | IP | IP in IP (encapsulation) |
| 5 | ST | Stream |
| 6 | TCP | Transmission Control |
| 7 | UCL | UCL |
| 8 | EGP | Exterior Gateway Protocol |
| 9 | IGP | any private interior gateway |
| 10 | BBN-RCC-MON | BBN RCC Monitoring |
| 11 | NVP-II | Network Voice Protocol |
| 12 | PUP | PUP |
| 13 | ARGUS | ARGUS |
| 14 | EMCON | EMCON |
| 15 | XNET | Cross Net Debugger |
| 16 | CHAOS | Chaos |
| 17 | UDP | User Datagram |
| 18 | MUX | Multiplexing |
| 19 | DCN-MEAS | DCN Measurement Subsystems |
| 20 | HMP | Host Monitoring |
| 21 | PRM | Packet Radio Measurement |
| 22 | XNS-IDP | XEROX NS IDP |
| 23 | TRUNK-1 | Trunk-1 |
| 24 | TRUNK-2 | Trunk-2 |
| 25 | LEAF-1 | Leaf-1 |
| 26 | LEAF-2 | Leaf-2 |
| 27 | RDP | Reliable Data Protocol |
| 28 | IRTP | Internet Reliable Transaction |
| 29 | ISO-TP4 | ISO Transport Protocol Class 4 |
| 30 | NETBLT | Bulk Data Transfer Protocol |
| 31 | MFE-NSP | MFE Network Services Protocol |
| 32 | MERIT-INP | MERIT Internodal Protocol |
| 33 | SEP | Sequential Exchange Protocol |
| 34 | 3PC | Third Party Connect Protocol |
| 35 | IDPR | Inter-Domain Policy Routing Protocol |
| 36 | XTP | XTP |
| 37 | DDP | Datagram Delivery Protocol |
| 38 | IDPR-CMTP | IDPR Control Message Transport Proto |
| 39 | TP++ | TP++ Transport Protocol |
| 40 | IL | IL Transport Protocol |
| 41 | SIP | Simple Internet Protocol |
| 42 | SDRP | Source Demand Routing Protocol |
| 43 | SIP-SR | SIP Source Route |
| 44 | SIP-FRAG | SIP Fragment |
| 45 | IDRP | Inter-Domain Routing Protocol |
| 46 | RSVP | Reservation Protocol |
| 47 | GRE | General Routing Encapsulation |
| 48 | MHRP | Mobile Host Routing Protocol |
| 49 | BNA | BNA |
| 50 | SIPP-ESP | SIPP Encapsulation Security Payload |
| 51 | SIPP-AH | SIPP Authentication Header |
| 52 | I-NLSP | Integrated Net Layer SecurityTUBA |
| 53 | SWIPE | IP with Encryption |
| 54 | NHRP | NBMA Next Hop Resolution Protocol |
| 55 | MOBILE | IP Mobility |
| 56 | TLSP | Transport Layer Security Protocol via Kryptonet key mgt |
| 57 | SKIP | SKIP |
| 58 | IPv6-ICMP | ICMP for IPv6 |
| 59 | IPv6-NoNxt | No Next Header for IPv6 |
| 60 | IPv6-Opts | Destination Options for IPv6 |
| 61 | — | any host internal protocols |
| 62 | CFTP | CFTP |
| 63 | — | any local network |
| 64 | SAT-EXPAK | SATNET and Backroom EXPAK |
| 65 | KRYPTOLAN | Kryptolan |
| 66 | RVD | MIT Remote Virtual Disk Protocol |
| 67 | IPPC | Internet Pluribus Packet Core |
| 68 | — | any distributed file system |
| 69 | SAT-MON | SATNET Monitoring |
| 70 | VISA | VISA Protocol |
| 71 | IPCV | Internet Packet Core Utility |
| 72 | CPNX | Computer Protocol Network Executive |
| 73 | CPHB | Computer Protocol Heart Beat |
| 74 | WSN | Wang Span Network |
| 75 | PVP | Packet Video Protocol |
| 76 | BR-SAT-MON | Backroom SATNET Monitoring |
| 77 | SUN-ND | SUN ND PROTOCOL—Temporary |
| 78 | WB-MON | WIDEBAND Monitoring |
| 79 | WB-EXPAK | WIDEBAND EXPAK |
| 80 | ISO-IP | ISO Internet Protocol |
| 81 | VMTP | VMTP |
| 82 | SECURE-VMTP | SECURE-VMTP |
| 83 | VINES | VINES |
| 84 | TTP | TTP |
| 85 | NSFNET-IGP | NSFNET-IGP |
| 86 | DGP | Dissimilar Gateway Protocol |
| 87 | TCF | TCF |
| 88 | IGRP | IGRP |
| 89 | OSPFIGP | OSPFIGP |
| 90 | Sprite-RPC | Sprite RPC Protocol |
| 91 | LARP | Locus Address Resolution Protocol |
| 92 | MTP | Multicast Transport Protocol |
| 93 | AX.25 | AX.25 Frames |
| 94 | PIP | IP-within-IP Encapsulation Protocol |
| 95 | MICP | Mobile Internetworking Control Pro. |
| 96 | SCC-SP | Semaphore Communications Sec. Pro. |
| 97 | ETHERIP | Ethernet-within-IP Encapsulation |
| 98 | ENCAP | Encapsulation Header |
| 99 | — | any private encryption scheme |
| 100 | GMTP | GMTP |
| 101 | IFMP | Ipsilon Flow Management Protocol |
| 102 | PNNI | PNNI over IP |
| 103–111 | — | Unassigned |
| 112 | VRRP | Virtual Router Redundancy Protocol (VRRP) |
| 113 | PGM | PGM Reliable Transport Protocol |
| 114 | — | any 0-hop protocol |
| 115 | L2TP | Layer Two Tunneling Protocol |
| 116 | DDX | D-II Data Exchange (DDX) |
| 117 | IATP | Interactive Agent Transfer Protocol |
| 118 | STP | Schedule Transfer Protocol |
| 119 | SRP | SpectraLink Radio Protocol |
| 120 | UTI | UTI |
| 121 | SMP | Simple Message Protocol |
| 122 | SM | SM |
| 123 | PTP | Performance Transparency Protocol |
| 124 | ISIS over IPv4 | |
| 125 | FIRE | |
| 126 | CRTP | Combat Radio Transport Protocol |
| 127 | CRUDP | Combat Radio User Datagram |
| 128 | SSCOPMCE | |
| 129 | IPLT | |
| 130 | SPS | Secure Packet Shield |
| 131 | PIPE | Private IP Encapsulation within IP |
| 132 | SCTP | Stream Control Transmission Protocol |
| 133 | FC | Fibre Channel |
| 134–254 | Unassigned | |
| 255 | Reserved |
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