IP上で使われるプロトコルに与えられた8ビットの番号のこと。
IPv4ではProtocol(プロトコル番号)欄、IPv6ではNext Header(次ヘッダ)欄の番号となるが、プロトコル番号自体はIPv4とIPv6で共通である。
古いものはRFC 1700、最新のものはIANAのサイトにて公開されている。
プロトコル番号
プロトコルの名前は慣習的に大文字で表記される。
またそのプロトコルを実際に実装したものについては小文字で表記されるのが一般的である。
| 番号 | キーワード | プロトコル名 | 照会資料 |
|---|---|---|---|
| 0 | HOPOPT | IPv6 Hop-by-Hop Option | RFC 1883 |
| 1 | ICMP | Internet Control Message | RFC 792 |
| 2 | IGMP | Internet Group Management | RFC 1112 |
| 3 | GGP | Gateway-to-Gateway | RFC 823 |
| 4 | IP | IP in IP (カプセル化) | RFC 2003 |
| 5 | ST | Stream | RFC 1190、RFC 1819 |
| 6 | TCP | Transmission Control | RFC 793 |
| 7 | CBT | CBT | Ballardie |
| 8 | EGP | Exterior Gateway Protocol | RFC 888、DLM1 |
| 9 | IGP | any private interior gateway | IANA |
| 10 | BBN-RCC-MON | BBN RCC Monitoring | SGC |
| 11 | NVP-II | Network Voice Protocol | RFC 741、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 | RFC 768、JBP |
| 18 | MUX | Multiplexing | IEN90、JBP |
| 19 | DCN-MEAS | DCN Measurement Subsystems | DLM1 |
| 20 | HMP | Host Monitoring | RFC 869、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 | |
| 25 | LEAF-1 | Leaf-1 | BWB6 |
| 26 | LEAF-2 | Leaf-2 | |
| 27 | RDP | Reliable Data Protocol | RFC 908、RH6 |
| 28 | IRTP | Internet Reliable Transaction | RFC 938、TXM |
| 29 | ISO-TP4 | ISO Transport Protocol Class 4 | RFC 905、RC77 |
| 30 | NETBLT | Bulk Data Transfer Protocol | RFC 969、DDC1 |
| 31 | MFE-NSP | MFE Network Services Protocol | MFENET、BCH2 |
| 32 | MERIT-INP | MERIT Internodal Protocol | HWB |
| 33 | DCCP | Datagram Congestion Control Protocol | |
| 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 | DXP2 |
| 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 | |
| 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 | RFC 2406 |
| 51 | AH | Authentication Header | RFC 2402 |
| 52 | I-NLSP | Integrated Net Layer Security TUBA | GLENN |
| 53 | SWIPE | IP with Encryption | JI6 |
| 54 | NHRP | NBMA Address Resolution Protocol | RFC 1735 |
| 55 | MOBILE | IP Mobility | Perkins |
| 56 | TLSP | Transport Layer Security Protocol | Oberg |
| 57 | SKIP | SKIP | Markson |
| 58 | IPv6-ICMP | ICMP for IPv6 | RFC 1883 |
| 59 | IPv6-NoNxt | No Next Header for IPv6 | |
| 60 | IPv6-Opts | Destination Options for IPv6 | |
| 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 | |
| 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 | RFC 1583、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 | RXH1 |
| 98 | ENCAP | Encapsulation Header | RFC 1241、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 | RFC 2393 |
| 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 | RFC 3768 |
| 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 | RFC 3175 | |
| 135 | Mobility Header | RFC 3775 | |
| 136 | UDPLite | RFC 3828 | |
| 137 | MPLS-in-IP | RFC 4023 | |
| 253 | 実験およびテスト用 | RFC 3692 | |
| 254 | 実験およびテスト用 | ||
| 255 | Reserved | IANA |
