Protocol Numbers

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 IPPCP IP Payload Compression Protocol [Doraswamy]`
`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]`
`116-254 Unassigned [IANA]`
`255 Reserved [IANA]`

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