This is a list of the IP protocol numbers found in the 8-bit ''Protocol'' field of the IPv4 header and the 8-bit ''Next Header'' field of the IPv6 header. It is an identifier for the encapsulated protocol and determines the layout of the data that immediately follows the header. Because both fields are eight bits wide, the possible values are limited to the 256 values from 0 (0x00) to 255 (0xFF), of which just over half had been allocated Protocol numbers are maintained and published by the

Internet Assigned Numbers Authority The Internet Assigned Numbers Authority (IANA) is a standards organization that oversees global IP address allocation, Autonomous system (Internet), autonomous system number allocation, DNS root zone, root zone management in the Domain Name Syste ...

(IANA). {, class="wikitable" , - ! class="nomobile" , Hex ! Protocol Number !! Keyword !! Protocol !! References/ RFC , - , style="text-align:right" class="nomobile" , 0x00 , style="text-align:right" , 0 , HOPOPT , IPv6 Hop-by-Hop Option , , - , style="text-align:right" class="nomobile" , 0x01 , style="text-align:right" , 1 , ICMP , Internet Control Message Protocol , , - , style="text-align:right" class="nomobile" , 0x02 , style="text-align:right" , 2 , IGMP , Internet Group Management Protocol , , - , style="text-align:right" class="nomobile" , 0x03 , style="text-align:right" , 3 , GGP , Gateway-to-Gateway Protocol , , - , style="text-align:right" class="nomobile" , 0x04 , style="text-align:right" , 4 , IP-in-IP , IP in IP (encapsulation) , , - , style="text-align:right" class="nomobile" , 0x05 , style="text-align:right" , 5 , ST , Internet Stream Protocol , , , - , style="text-align:right" class="nomobile" , 0x06 , style="text-align:right" , 6 , TCP ,

Transmission Control Protocol The Transmission Control Protocol (TCP) is one of the main communications protocol, protocols of the Internet protocol suite. It originated in the initial network implementation in which it complemented the Internet Protocol (IP). Therefore, th ...

, , - , style="text-align:right" class="nomobile" , 0x07 , style="text-align:right" , 7 , CBT , Core-based trees , , - , style="text-align:right" class="nomobile" , 0x08 , style="text-align:right" , 8 , EGP , Exterior Gateway Protocol , , - , style="text-align:right" class="nomobile" , 0x09 , style="text-align:right" , 9 , IGP , Interior gateway protocol (any private interior gateway, for example Cisco's IGRP) , , - , style="text-align:right" class="nomobile" , 0x0A , style="text-align:right" , 10 , BBN-RCC-MON , BBN RCC Monitoring , , - , style="text-align:right" class="nomobile" , 0x0B , style="text-align:right" , 11 , NVP-II , Network Voice Protocol , , - , style="text-align:right" class="nomobile" , 0x0C , style="text-align:right" , 12 , PUP , Xerox PUP , , - , style="text-align:right" class="nomobile" , 0x0D , style="text-align:right" , 13 , ARGUS , ARGUS , , - , style="text-align:right" class="nomobile" , 0x0E , style="text-align:right" , 14 , EMCON , EMCON , , - , style="text-align:right" class="nomobile" , 0x0F , style="text-align:right" , 15 , XNET , Cross Net Debugger , IEN 158 , - , style="text-align:right" class="nomobile" , 0x10 , style="text-align:right" , 16 , CHAOS , Chaos , , - , style="text-align:right" class="nomobile" , 0x11 , style="text-align:right" , 17 , UDP ,

User Datagram Protocol In computer networking, the User Datagram Protocol (UDP) is one of the core communication protocols of the Internet protocol suite used to send messages (transported as datagrams in Network packet, packets) to other hosts on an Internet Protoco ...

, , - , style="text-align:right" class="nomobile" , 0x12 , style="text-align:right" , 18 , MUX , Multiplexing , IEN 90 , - , style="text-align:right" class="nomobile" , 0x13 , style="text-align:right" , 19 , DCN-MEAS , DCN Measurement Subsystems , , - , style="text-align:right" class="nomobile" , 0x14 , style="text-align:right" , 20 , HMP , Host Monitoring Protocol , , - , style="text-align:right" class="nomobile" , 0x15 , style="text-align:right" , 21 , PRM , Packet Radio Measurement , , - , style="text-align:right" class="nomobile" , 0x16 , style="text-align:right" , 22 , XNS-IDP , XEROX NS IDP , , - , style="text-align:right" class="nomobile" , 0x17 , style="text-align:right" , 23 , TRUNK-1 , Trunk-1 , , - , style="text-align:right" class="nomobile" , 0x18 , style="text-align:right" , 24 , TRUNK-2 , Trunk-2 , , - , style="text-align:right" class="nomobile" , 0x19 , style="text-align:right" , 25 , LEAF-1 , Leaf-1 , , - , style="text-align:right" class="nomobile" , 0x1A , style="text-align:right" , 26 , LEAF-2 , Leaf-2 , , - , style="text-align:right" class="nomobile" , 0x1B , style="text-align:right" , 27 , RDP , Reliable Data Protocol , , - , style="text-align:right" class="nomobile" , 0x1C , style="text-align:right" , 28 , IRTP , Internet Reliable Transaction Protocol , , - , style="text-align:right" class="nomobile" , 0x1D , style="text-align:right" , 29 , ISO-TP4 , ISO Transport Protocol Class 4 , , - , style="text-align:right" class="nomobile" , 0x1E , style="text-align:right" , 30 , NETBLT , Bulk Data Transfer Protocol , , - , style="text-align:right" class="nomobile" , 0x1F , style="text-align:right" , 31 , MFE-NSP , MFE Network Services Protocol , , - , style="text-align:right" class="nomobile" , 0x20 , style="text-align:right" , 32 , MERIT-INP , MERIT Internodal Protocol , , - , style="text-align:right" class="nomobile" , 0x21 , style="text-align:right" , 33 , DCCP , Datagram Congestion Control Protocol , , - , style="text-align:right" class="nomobile" , 0x22 , style="text-align:right" , 34 , 3PC , Third Party Connect Protocol , , - , style="text-align:right" class="nomobile" , 0x23 , style="text-align:right" , 35 , IDPR , Inter-Domain Policy Routing Protocol , , - , style="text-align:right" class="nomobile" , 0x24 , style="text-align:right" , 36 , XTP , Xpress Transport Protocol , , - , style="text-align:right" class="nomobile" , 0x25 , style="text-align:right" , 37 , DDP , Datagram Delivery Protocol , , - , style="text-align:right" class="nomobile" , 0x26 , style="text-align:right" , 38 , IDPR-CMTP , IDPR Control Message Transport Protocol , , - , style="text-align:right" class="nomobile" , 0x27 , style="text-align:right" , 39 , TP++ , TP++ Transport Protocol , , - , style="text-align:right" class="nomobile" , 0x28 , style="text-align:right" , 40 , IL , IL Transport Protocol , , - , style="text-align:right" class="nomobile" , 0x29 , style="text-align:right" , 41 , IPv6 , IPv6 Encapsulation ( 6to4 and 6in4) , , - , style="text-align:right" class="nomobile" , 0x2A , style="text-align:right" , 42 , SDRP , Source Demand Routing Protocol , , - , style="text-align:right" class="nomobile" , 0x2B , style="text-align:right" , 43 , IPv6-Route , Routing Header for

IPv6 Internet Protocol version 6 (IPv6) is the most recent version of the Internet Protocol (IP), the communication protocol, communications protocol that provides an identification and location system for computers on networks and routes traffic ...

, , - , style="text-align:right" class="nomobile" , 0x2C , style="text-align:right" , 44 , IPv6-Frag , Fragment Header for

, , - , style="text-align:right" class="nomobile" , 0x2D , style="text-align:right" , 45 , IDRP , Inter-Domain Routing Protocol , , - , style="text-align:right" class="nomobile" , 0x2E , style="text-align:right" , 46 , RSVP , Resource Reservation Protocol , , - , style="text-align:right" class="nomobile" , 0x2F , style="text-align:right" , 47 , GRE , Generic Routing Encapsulation , , , - , style="text-align:right" class="nomobile" , 0x30 , style="text-align:right" , 48 , DSR , Dynamic Source Routing Protocol , , - , style="text-align:right" class="nomobile" , 0x31 , style="text-align:right" , 49 , BNA , Burroughs Network Architecture , , - , style="text-align:right" class="nomobile" , 0x32 , style="text-align:right" , 50 , ESP , Encapsulating Security Payload , , - , style="text-align:right" class="nomobile" , 0x33 , style="text-align:right" , 51 , AH , Authentication Header , , - , style="text-align:right" class="nomobile" , 0x34 , style="text-align:right" , 52 , I-NLSP , Integrated Net Layer Security Protocol , TUBA , - , style="text-align:right" class="nomobile" , 0x35 , style="text-align:right" , 53 , SwIPe , SwIPe , , - , style="text-align:right" class="nomobile" , 0x36 , style="text-align:right" , 54 , NARP , NBMA Address Resolution Protocol , , - , style="text-align:right" class="nomobile" , 0x37 , style="text-align:right" , 55 , MOBILE , IP Mobility (Min Encap) , , - , style="text-align:right" class="nomobile" , 0x38 , style="text-align:right" , 56 , TLSP , Transport Layer Security Protocol (using Kryptonet key management) , , - , style="text-align:right" class="nomobile" , 0x39 , style="text-align:right" , 57 , SKIP , Simple Key-Management for Internet Protocol , , - , style="text-align:right" class="nomobile" , 0x3A , style="text-align:right" , 58 , IPv6-ICMP , ICMP for IPv6 , , , - , style="text-align:right" class="nomobile" , 0x3B , style="text-align:right" , 59 , IPv6-NoNxt , No Next Header for

, , - , style="text-align:right" class="nomobile" , 0x3C , style="text-align:right" , 60 , IPv6-Opts , Destination Options for

, , - , style="text-align:right" class="nomobile" , 0x3D , style="text-align:right" , 61 , , Any host internal protocol , , - , style="text-align:right" class="nomobile" , 0x3E , style="text-align:right" , 62 , CFTP , CFTP , , - , style="text-align:right" class="nomobile" , 0x3F , style="text-align:right" , 63 , , Any local network , , - , style="text-align:right" class="nomobile" , 0x40 , style="text-align:right" , 64 , SAT-EXPAK , SATNET and Backroom EXPAK , , - , style="text-align:right" class="nomobile" , 0x41 , style="text-align:right" , 65 , KRYPTOLAN , Kryptolan , , - , style="text-align:right" class="nomobile" , 0x42 , style="text-align:right" , 66 , RVD , MIT Remote Virtual Disk Protocol , , - , style="text-align:right" class="nomobile" , 0x43 , style="text-align:right" , 67 , IPPC , Internet Pluribus Packet Core , , - , style="text-align:right" class="nomobile" , 0x44 , style="text-align:right" , 68 , , Any distributed file system , , - , style="text-align:right" class="nomobile" , 0x45 , style="text-align:right" , 69 , SAT-MON , SATNET Monitoring , , - , style="text-align:right" class="nomobile" , 0x46 , style="text-align:right" , 70 , VISA , VISA Protocol , , - , style="text-align:right" class="nomobile" , 0x47 , style="text-align:right" , 71 , IPCU , Internet Packet Core Utility , , - , style="text-align:right" class="nomobile" , 0x48 , style="text-align:right" , 72 , CPNX , Computer Protocol Network Executive , , - , style="text-align:right" class="nomobile" , 0x49 , style="text-align:right" , 73 , CPHB , Computer Protocol Heart Beat , , - , style="text-align:right" class="nomobile" , 0x4A , style="text-align:right" , 74 , WSN , Wang Span Network , , - , style="text-align:right" class="nomobile" , 0x4B , style="text-align:right" , 75 , PVP , Packet Video Protocol , , - , style="text-align:right" class="nomobile" , 0x4C , style="text-align:right" , 76 , BR-SAT-MON , Backroom SATNET Monitoring , , - , style="text-align:right" class="nomobile" , 0x4D , style="text-align:right" , 77 , SUN-ND , SUN ND PROTOCOL-Temporary , , - , style="text-align:right" class="nomobile" , 0x4E , style="text-align:right" , 78 , WB-MON , WIDEBAND Monitoring , , - , style="text-align:right" class="nomobile" , 0x4F , style="text-align:right" , 79 , WB-EXPAK , WIDEBAND EXPAK , , - , style="text-align:right" class="nomobile" , 0x50 , style="text-align:right" , 80 , ISO-IP , International Organization for Standardization Internet Protocol , , - , style="text-align:right" class="nomobile" , 0x51 , style="text-align:right" , 81 , VMTP , Versatile Message Transaction Protocol , , - , style="text-align:right" class="nomobile" , 0x52 , style="text-align:right" , 82 , SECURE-VMTP , Secure Versatile Message Transaction Protocol , , - , style="text-align:right" class="nomobile" , 0x53 , style="text-align:right" , 83 , VINES , VINES , , - , style="text-align:right" class="nomobile" , 0x54 , style="text-align:right" , 84 , TTP , TTP (Transaction Transport Protocol) (obsoleted March 2023) , , - , style="text-align:right" class="nomobile" , 0x54 , style="text-align:right" , 84 , IPTM , Internet Protocol Traffic Manager , , - , style="text-align:right" class="nomobile" , 0x55 , style="text-align:right" , 85 , NSFNET-IGP , NSFNET-IGP , , - , style="text-align:right" class="nomobile" , 0x56 , style="text-align:right" , 86 , DGP , Dissimilar Gateway Protocol , , - , style="text-align:right" class="nomobile" , 0x57 , style="text-align:right" , 87 , TCF , TCF , , - , style="text-align:right" class="nomobile" , 0x58 , style="text-align:right" , 88 , EIGRP , EIGRP , Informational , - , style="text-align:right" class="nomobile" , 0x59 , style="text-align:right" , 89 , OSPF ,

Open Shortest Path First Open Shortest Path First (OSPF) is a routing protocol for Internet Protocol (IP) networks. It uses a link state routing (LSR) algorithm and falls into the group of interior gateway protocols (IGPs), operating within a single Autonomous syste ...

, , - , style="text-align:right" class="nomobile" , 0x5A , style="text-align:right" , 90 , Sprite-RPC , Sprite RPC Protocol , , - , style="text-align:right" class="nomobile" , 0x5B , style="text-align:right" , 91 , LARP , Locus Address Resolution Protocol , , - , style="text-align:right" class="nomobile" , 0x5C , style="text-align:right" , 92 , MTP , Multicast Transport Protocol , , - , style="text-align:right" class="nomobile" , 0x5D , style="text-align:right" , 93 , AX.25 , AX.25 , , - , style="text-align:right" class="nomobile" , 0x5E , style="text-align:right" , 94 , OS , KA9Q NOS compatible IP over IP tunneling , , - , style="text-align:right" class="nomobile" , 0x5F , style="text-align:right" , 95 , MICP , Mobile Internetworking Control Protocol , , - , style="text-align:right" class="nomobile" , 0x60 , style="text-align:right" , 96 , SCC-SP , Semaphore Communications Sec. Pro , , - , style="text-align:right" class="nomobile" , 0x61 , style="text-align:right" , 97 , ETHERIP , Ethernet-within-IP Encapsulation , , - , style="text-align:right" class="nomobile" , 0x62 , style="text-align:right" , 98 , ENCAP , Encapsulation Header , , - , style="text-align:right" class="nomobile" , 0x63 , style="text-align:right" , 99 , , Any private encryption scheme , , - , style="text-align:right" class="nomobile" , 0x64 , style="text-align:right" , 100 , GMTP , GMTP , , - , style="text-align:right" class="nomobile" , 0x65 , style="text-align:right" , 101 , IFMP , Ipsilon Flow Management Protocol , , - , style="text-align:right" class="nomobile" , 0x66 , style="text-align:right" , 102 , PNNI , PNNI over IP , , - , style="text-align:right" class="nomobile" , 0x67 , style="text-align:right" , 103 , PIM , Protocol Independent Multicast , , - , style="text-align:right" class="nomobile" , 0x68 , style="text-align:right" , 104 , ARIS , IBM's ARIS (Aggregate Route IP Switching) Protocol , , - , style="text-align:right" class="nomobile" , 0x69 , style="text-align:right" , 105 , SCPS , SCPS (Space Communications Protocol Standards) , SCPS-TP , - , style="text-align:right" class="nomobile" , 0x6A , style="text-align:right" , 106 , QNX , QNX , , - , style="text-align:right" class="nomobile" , 0x6B , style="text-align:right" , 107 , A/N , Active Networks , , - , style="text-align:right" class="nomobile" , 0x6C , style="text-align:right" , 108 , IPComp , IP Payload Compression Protocol , , - , style="text-align:right" class="nomobile" , 0x6D , style="text-align:right" , 109 , SNP , Sitara Networks Protocol , , - , style="text-align:right" class="nomobile" , 0x6E , style="text-align:right" , 110 , Compaq-Peer , Compaq Peer Protocol , , - , style="text-align:right" class="nomobile" , 0x6F , style="text-align:right" , 111 , IPX-in-IP , IPX in IP , , - , style="text-align:right" class="nomobile" , 0x70 , style="text-align:right" , 112 , VRRP , Virtual Router Redundancy Protocol, Common Address Redundancy Protocol (not IANA assigned) , , - , style="text-align:right" class="nomobile" , 0x71 , style="text-align:right" , 113 , PGM , PGM Reliable Transport Protocol , , - , style="text-align:right" class="nomobile" , 0x72 , style="text-align:right" , 114 , , Any 0-hop protocol , , - , style="text-align:right" class="nomobile" , 0x73 , style="text-align:right" , 115 , L2TP , Layer Two Tunneling Protocol Version 3 , , - , style="text-align:right" class="nomobile" , 0x74 , style="text-align:right" , 116 , DDX , D-II Data Exchange (DDX) , , - , style="text-align:right" class="nomobile" , 0x75 , style="text-align:right" , 117 , IATP , Interactive Agent Transfer Protocol , , - , style="text-align:right" class="nomobile" , 0x76 , style="text-align:right" , 118 , STP , Schedule Transfer Protocol , , - , style="text-align:right" class="nomobile" , 0x77 , style="text-align:right" , 119 , SRP , SpectraLink Radio Protocol , , - , style="text-align:right" class="nomobile" , 0x78 , style="text-align:right" , 120 , UTI , Universal Transport Interface Protocol , , - , style="text-align:right" class="nomobile" , 0x79 , style="text-align:right" , 121 , SMP , Simple Message Protocol , , - , style="text-align:right" class="nomobile" , 0x7A , style="text-align:right" , 122 , SM , Simple Multicast Protocol
draft-perlman-simple-multicast-03
, - , style="text-align:right" class="nomobile" , 0x7B , style="text-align:right" , 123 , PTP , Performance Transparency Protocol , , - , style="text-align:right" class="nomobile" , 0x7C , style="text-align:right" , 124 , IS-IS over IPv4 , Intermediate System to Intermediate System (IS-IS) Protocol over

IPv4 Internet Protocol version 4 (IPv4) is the first version of the Internet Protocol (IP) as a standalone specification. It is one of the core protocols of standards-based internetworking methods in the Internet and other packet-switched networks. ...

, and , - , style="text-align:right" class="nomobile" , 0x7D , style="text-align:right" , 125 , FIRE , Flexible Intra-AS Routing Environment , , - , style="text-align:right" class="nomobile" , 0x7E , style="text-align:right" , 126 , CRTP , Combat Radio Transport Protocol , , - , style="text-align:right" class="nomobile" , 0x7F , style="text-align:right" , 127 , CRUDP , Combat Radio User Datagram , , - , style="text-align:right" class="nomobile" , 0x80 , style="text-align:right" , 128 , SSCOPMCE , Service-Specific Connection-Oriented Protocol in a Multilink and Connectionless Environment
ITU-T Q.2111 (1999)
, - , style="text-align:right" class="nomobile" , 0x81 , style="text-align:right" , 129 , IPLT , , , - , style="text-align:right" class="nomobile" , 0x82 , style="text-align:right" , 130 , SPS , Secure Packet Shield , , - , style="text-align:right" class="nomobile" , 0x83 , style="text-align:right" , 131 , PIPE , Private IP Encapsulation within IP
Expired I-D draft-petri-mobileip-pipe-00.txt
, - , style="text-align:right" class="nomobile" , 0x84 , style="text-align:right" , 132 , SCTP ,

Stream Control Transmission Protocol The Stream Control Transmission Protocol (SCTP) is a computer networking communications protocol in the transport layer of the Internet protocol suite. Originally intended for Signaling System 7 (SS7) message transport in telecommunication, the ...

, , - , style="text-align:right" class="nomobile" , 0x85 , style="text-align:right" , 133 , FC ,

Fibre Channel Fibre Channel (FC) is a high-speed data transfer protocol providing in-order, lossless delivery of raw block data. Fibre Channel is primarily used to connect computer data storage to Server (computing), servers in storage area networks (SAN) in ...

, , - , style="text-align:right" class="nomobile" , 0x86 , style="text-align:right" , 134 , RSVP-E2E-IGNORE , Reservation Protocol (RSVP) End-to-End Ignore , , - , style="text-align:right" class="nomobile" , 0x87 , style="text-align:right" , 135 , Mobility Header , Mobility Extension Header for IPv6 , , - , style="text-align:right" class="nomobile" , 0x88 , style="text-align:right" , 136 , UDPLite , Lightweight User Datagram Protocol , , - , style="text-align:right" class="nomobile" , 0x89 , style="text-align:right" , 137 , MPLS-in-IP ,

Multiprotocol Label Switching Multiprotocol Label Switching (MPLS) is a routing technique in telecommunications networks that directs data from one node to the next based on labels rather than network addresses. Whereas network addresses identify endpoints, the labels iden ...

Encapsulated in IP , , , - , style="text-align:right" class="nomobile" , 0x8A , style="text-align:right" , 138 , manet , MANET Protocols , , - , style="text-align:right" class="nomobile" , 0x8B , style="text-align:right" , 139 , HIP , Host Identity Protocol , , - , style="text-align:right" class="nomobile" , 0x8C , style="text-align:right" , 140 , Shim6 , Site Multihoming by IPv6 Intermediation , , - , style="text-align:right" class="nomobile" , 0x8D , style="text-align:right" , 141 , WESP , Wrapped Encapsulating Security Payload , , - , style="text-align:right" class="nomobile" , 0x8E , style="text-align:right" , 142 , ROHC , Robust Header Compression , , - , style="text-align:right" class="nomobile" , 0x8F , style="text-align:right" , 143 , Ethernet , Segment Routing over IPv6 , , -- , style="text-align:right" class="nomobile" , 0x90 , style="text-align:right" , 144 , AGGFRAG , AGGFRAG Encapsulation Payload for ESP , , -- , style="text-align:right" class="nomobile" , 0x91 , style="text-align:right" , 145 , NSH , Network Service Header
draft-ietf-spring-nsh-sr
, -- , style="text-align:right" class="nomobile" , 0x92 , style="text-align:right" , 146 , Homa , Homa transport protocol
Homa research paperHomaModule
, -- , style="text-align:right" class="nomobile" , 0x93 , style="text-align:right" , 147 , BIT-EMU , Bit-stream Emulation
draft-ietf-pals-ple-14
, -- , style="text-align:right" class="nomobile" , 0x94-0xFC , style="text-align:right" , 148-252 , colspan="2" style="background-color:#EEE" , Unassigned , , - , style="text-align:right" class="nomobile" , 0xFD-0xFE , style="text-align:right" , 253-254 , colspan="2" , Use for experimentation and testing , {{IETF RFC, 3692, link=no , - , style="text-align:right" class="nomobile" , 0xFF , style="text-align:right" , 255 , colspan="2" style="background-color:#FED" , Reserved ,

References

Internet Protocol IPv4 protocol numbers. IP protocol numbers

See also

References