Protocol Numbers Last Updated 2016-06-22 Available Formats [IMG] XML [IMG] HTML [IMG] Plain text Registry included below * Assigned Internet Protocol NumbersAssigned Internet Protocol Numbers Registration Procedure(s) IESG Approval or Standards Action Reference [RFC5237][RFC7045] Note 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) [RFC2460], this field is called the "Next Header" field. Note Values that are also IPv6 Extension Header Types should be listed in the IPv6 Extension Header Types registry at [IANA registry ipv6-parameters]. Available Formats [IMG] CSV Decimal Keyword Protocol IPv6 Extension Reference Header 0 HOPOPT IPv6 Hop-by-Hop Option Y [RFC2460] 1 ICMP Internet Control Message [RFC792] 2 IGMP Internet Group Management [RFC1112] 3 GGP Gateway-to-Gateway [RFC823] 4 IPv4 IPv4 encapsulation [RFC2003] 5 ST Stream [RFC1190][RFC1819] 6 TCP Transmission Control [RFC793] 7 CBT CBT [Tony_Ballardie] 8 EGP Exterior Gateway Protocol [RFC888][David_Mills] any private interior gateway 9 IGP (used by Cisco for their [Internet_Assigned_Numbers_Authority] IGRP) 10 BBN-RCC-MON BBN RCC Monitoring [Steve_Chipman] 11 NVP-II Network Voice Protocol [RFC741][Steve_Casner] [Boggs, D., J. Shoch, E. Taft, and R. Metcalfe, "PUP: An Internetwork 12 PUP PUP Architecture", XEROX Palo Alto Research Center, CSL-79-10, July 1979; also in IEEE Transactions on Communication, Volume COM-28, Number 4, April 1980.][[XEROX]] 13 ARGUS (deprecated) ARGUS [Robert_W_Scheifler] 14 EMCON EMCON [] 15 XNET Cross Net Debugger [Haverty, J., "XNET Formats for Internet Protocol Version 4", IEN 158, October 1980.][Jack_Haverty] 16 CHAOS Chaos [J_Noel_Chiappa] 17 UDP User Datagram [RFC768][Jon_Postel] 18 MUX Multiplexing [Cohen, D. and J. Postel, "Multiplexing Protocol", IEN 90, USC/Information Sciences Institute, May 1979.][Jon_Postel] 19 DCN-MEAS DCN Measurement Subsystems [David_Mills] 20 HMP Host Monitoring [RFC869][Bob_Hinden] 21 PRM Packet Radio Measurement [Zaw_Sing_Su] ["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 22 XNS-IDP XEROX NS IDP 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.][[XEROX]] 23 TRUNK-1 Trunk-1 [Barry_Boehm] 24 TRUNK-2 Trunk-2 [Barry_Boehm] 25 LEAF-1 Leaf-1 [Barry_Boehm] 26 LEAF-2 Leaf-2 [Barry_Boehm] 27 RDP Reliable Data Protocol [RFC908][Bob_Hinden] 28 IRTP Internet Reliable [RFC938][Trudy_Miller] Transaction 29 ISO-TP4 ISO Transport Protocol Class [RFC905][ ] 4 30 NETBLT Bulk Data Transfer Protocol [RFC969][David_Clark] MFE Network Services [Shuttleworth, B., "A Documentary of MFENet, a National Computer 31 MFE-NSP Protocol Network", UCRL-52317, Lawrence Livermore Labs, Livermore, California, June 1977.][Barry_Howard] 32 MERIT-INP MERIT Internodal Protocol [Hans_Werner_Braun] 33 DCCP Datagram Congestion Control [RFC4340] Protocol 34 3PC Third Party Connect Protocol [Stuart_A_Friedberg] 35 IDPR Inter-Domain Policy Routing [Martha_Steenstrup] Protocol 36 XTP XTP [Greg_Chesson] 37 DDP Datagram Delivery Protocol [Wesley_Craig] 38 IDPR-CMTP IDPR Control Message [Martha_Steenstrup] Transport Proto 39 TP++ TP++ Transport Protocol [Dirk_Fromhein] 40 IL IL Transport Protocol [Dave_Presotto] 41 IPv6 IPv6 encapsulation [RFC2473] 42 SDRP Source Demand Routing [Deborah_Estrin] Protocol 43 IPv6-Route Routing Header for IPv6 Y [Steve_Deering] 44 IPv6-Frag Fragment Header for IPv6 Y [Steve_Deering] 45 IDRP Inter-Domain Routing [Sue_Hares] Protocol 46 RSVP Reservation Protocol [RFC2205][RFC3209][Bob_Braden] 47 GRE Generic Routing [RFC2784][Tony_Li] Encapsulation 48 DSR Dynamic Source Routing [RFC4728] Protocol 49 BNA BNA [Gary Salamon] 50 ESP Encap Security Payload Y [RFC4303] 51 AH Authentication Header Y [RFC4302] 52 I-NLSP Integrated Net Layer [K_Robert_Glenn] Security TUBA 53 SWIPE (deprecated) IP with Encryption [John_Ioannidis] 54 NARP NBMA Address Resolution [RFC1735] Protocol 55 MOBILE IP Mobility [Charlie_Perkins] Transport Layer Security 56 TLSP Protocol using Kryptonet key [Christer_Oberg] management 57 SKIP SKIP [Tom_Markson] 58 IPv6-ICMP ICMP for IPv6 [RFC2460] 59 IPv6-NoNxt No Next Header for IPv6 [RFC2460] 60 IPv6-Opts Destination Options for IPv6 Y [RFC2460] 61 any host internal protocol [Internet_Assigned_Numbers_Authority] 62 CFTP CFTP [Forsdick, H., "CFTP", Network Message, Bolt Beranek and Newman, January 1982.][Harry_Forsdick] 63 any local network [Internet_Assigned_Numbers_Authority] 64 SAT-EXPAK SATNET and Backroom EXPAK [Steven_Blumenthal] 65 KRYPTOLAN Kryptolan [Paul Liu] 66 RVD MIT Remote Virtual Disk [Michael_Greenwald] Protocol 67 IPPC Internet Pluribus Packet [Steven_Blumenthal] Core 68 any distributed file system [Internet_Assigned_Numbers_Authority] 69 SAT-MON SATNET Monitoring [Steven_Blumenthal] 70 VISA VISA Protocol [Gene_Tsudik] 71 IPCV Internet Packet Core Utility [Steven_Blumenthal] 72 CPNX Computer Protocol Network [David Mittnacht] Executive 73 CPHB Computer Protocol Heart Beat [David Mittnacht] 74 WSN Wang Span Network [Victor Dafoulas] 75 PVP Packet Video Protocol [Steve_Casner] 76 BR-SAT-MON Backroom SATNET Monitoring [Steven_Blumenthal] 77 SUN-ND SUN ND PROTOCOL-Temporary [William_Melohn] 78 WB-MON WIDEBAND Monitoring [Steven_Blumenthal] 79 WB-EXPAK WIDEBAND EXPAK [Steven_Blumenthal] 80 ISO-IP ISO Internet Protocol [Marshall_T_Rose] 81 VMTP VMTP [Dave_Cheriton] 82 SECURE-VMTP SECURE-VMTP [Dave_Cheriton] 83 VINES VINES [Brian Horn] 84 TTP Transaction Transport [Jim_Stevens] Protocol 84 IPTM Internet Protocol Traffic [Jim_Stevens] Manager 85 NSFNET-IGP NSFNET-IGP [Hans_Werner_Braun] 86 DGP Dissimilar Gateway Protocol [M/A-COM Government Systems, "Dissimilar Gateway Protocol Specification, Draft Version", Contract no. CS901145, November 16, 1987.][Mike_Little] 87 TCF TCF [Guillermo_A_Loyola] 88 EIGRP EIGRP [RFC7868] 89 OSPFIGP OSPFIGP [RFC1583][RFC2328][RFC5340][John_Moy] [Welch, B., "The Sprite Remote Procedure Call System", Technical Report, 90 Sprite-RPC Sprite RPC Protocol UCB/Computer Science Dept., 86/302, University of California at Berkeley, June 1986.][Bruce Willins] 91 LARP Locus Address Resolution [Brian Horn] Protocol 92 MTP Multicast Transport Protocol [Susie_Armstrong] 93 AX.25 AX.25 Frames [Brian_Kantor] 94 IPIP IP-within-IP Encapsulation [John_Ioannidis] Protocol 95 MICP (deprecated) Mobile Internetworking [John_Ioannidis] Control Pro. 96 SCC-SP Semaphore Communications [Howard_Hart] Sec. Pro. 97 ETHERIP Ethernet-within-IP [RFC3378] Encapsulation 98 ENCAP Encapsulation Header [RFC1241][Robert_Woodburn] 99 any private encryption [Internet_Assigned_Numbers_Authority] scheme 100 GMTP GMTP [[RXB5]] 101 IFMP Ipsilon Flow Management [Bob_Hinden][November 1995, 1997.] Protocol 102 PNNI PNNI over IP [Ross_Callon] 103 PIM Protocol Independent [RFC7761][Dino_Farinacci] Multicast 104 ARIS ARIS [Nancy_Feldman] 105 SCPS SCPS [Robert_Durst] 106 QNX QNX [Michael_Hunter] 107 A/N Active Networks [Bob_Braden] 108 IPComp IP Payload Compression [RFC2393] Protocol 109 SNP Sitara Networks Protocol [Manickam_R_Sridhar] 110 Compaq-Peer Compaq Peer Protocol [Victor_Volpe] 111 IPX-in-IP IPX in IP [CJ_Lee] 112 VRRP Virtual Router Redundancy [RFC5798] Protocol 113 PGM PGM Reliable Transport [Tony_Speakman] Protocol 114 any 0-hop protocol [Internet_Assigned_Numbers_Authority] 115 L2TP Layer Two Tunneling Protocol [RFC3931][Bernard_Aboba] 116 DDX D-II Data Exchange (DDX) [John_Worley] 117 IATP Interactive Agent Transfer [John_Murphy] Protocol 118 STP Schedule Transfer Protocol [Jean_Michel_Pittet] 119 SRP SpectraLink Radio Protocol [Mark_Hamilton] 120 UTI UTI [Peter_Lothberg] 121 SMP Simple Message Protocol [Leif_Ekblad] 122 SM (deprecated) Simple Multicast Protocol [Jon_Crowcroft][draft-perlman-simple-multicast] 123 PTP Performance Transparency [Michael_Welzl] Protocol 124 ISIS over IPv4 [Tony_Przygienda] 125 FIRE [Criag_Partridge] 126 CRTP Combat Radio Transport [Robert_Sautter] Protocol 127 CRUDP Combat Radio User Datagram [Robert_Sautter] 128 SSCOPMCE [Kurt_Waber] 129 IPLT [[Hollbach]] 130 SPS Secure Packet Shield [Bill_McIntosh] 131 PIPE Private IP Encapsulation [Bernhard_Petri] within IP 132 SCTP Stream Control Transmission [Randall_R_Stewart] Protocol 133 FC Fibre Channel [Murali_Rajagopal][RFC6172] 134 RSVP-E2E-IGNORE [RFC3175] 135 Mobility Header Y [RFC6275] 136 UDPLite [RFC3828] 137 MPLS-in-IP [RFC4023] 138 manet MANET Protocols [RFC5498] 139 HIP Host Identity Protocol Y [RFC7401] 140 Shim6 Shim6 Protocol Y [RFC5533] 141 WESP Wrapped Encapsulating [RFC5840] Security Payload 142 ROHC Robust Header Compression [RFC5858] 143-252 Unassigned [Internet_Assigned_Numbers_Authority] 253 Use for experimentation and Y [RFC3692] testing 254 Use for experimentation and Y [RFC3692] testing 255 Reserved [Internet_Assigned_Numbers_Authority]