PROTOCOL NUMBERS Extracted from www.iana.org. 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,IEN119] 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 Encap Security Payload for IPv6 [RFC1827] 51 AH Authentication Header for IPv6 [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 [RXH1] 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 ST Schedule Transfer [JMP] 119 SRP SpectraLink Radio Protocol [Hamilton] 120-254 Unassigned [IANA] 255 Reserved [IANA] From www.iana.org Page 1 Protocol Numbers