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List of IP protocol numbers

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From Wikipedia, the free encyclopedia
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  1. List of IP protocol numbers

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 as of 2025.

Protocol numbers are maintained and published by the Internet Assigned Numbers Authority (IANA).1

HexProtocol NumberKeywordProtocolReferences/RFC
0x000HOPOPTIPv6 Hop-by-Hop OptionRFC 8200
0x011ICMPInternet Control Message ProtocolRFC 792
0x022IGMP
Internet Group Management Protocol
RFC 1112
0x033GGPGateway-to-Gateway ProtocolRFC 823
0x044IP-in-IPIP in IP (encapsulation)RFC 2003
0x055STInternet Stream ProtocolRFC 1190, RFC 1819
0x066TCPTransmission Control ProtocolRFC 793
0x077CBTCore-based treesRFC 2189
0x088EGPExterior Gateway ProtocolRFC 888
0x099IGPInterior gateway protocol (any private interior gateway, for example Cisco's IGRP)
0x0A10BBN-RCC-MONBBN RCC Monitoring
0x0B11NVP-IINetwork Voice ProtocolRFC 741
0x0C12PUPXerox PUP
0x0D13ARGUSARGUS
0x0E14EMCONEMCON
0x0F15XNETCross Net DebuggerIEN 1582
0x1016CHAOSChaos
0x1117UDPUser Datagram ProtocolRFC 768
0x1218MUXMultiplexingIEN 903
0x1319DCN-MEASDCN Measurement Subsystems
0x1420HMPHost Monitoring ProtocolRFC 869
0x1521PRMPacket Radio Measurement
0x1622XNS-IDPXEROX NS IDP
0x1723TRUNK-1Trunk-1
0x1824TRUNK-2Trunk-2
0x1925LEAF-1Leaf-1
0x1A26LEAF-2Leaf-2
0x1B27RDPReliable Data ProtocolRFC 908
0x1C28IRTPInternet Reliable Transaction ProtocolRFC 938
0x1D29ISO-TP4ISO Transport Protocol Class 4RFC 905
0x1E30NETBLTBulk Data Transfer ProtocolRFC 998
0x1F31MFE-NSPMFE Network Services Protocol
0x2032MERIT-INPMERIT Internodal Protocol
0x2133DCCPDatagram Congestion Control ProtocolRFC 4340
0x22343PCThird Party Connect Protocol
0x2335IDPRInter-Domain Policy Routing ProtocolRFC 1479
0x2436XTPXpress Transport Protocol
0x2537DDPDatagram Delivery Protocol
0x2638IDPR-CMTPIDPR Control Message Transport Protocol
0x2739TP++TP++ Transport Protocol
0x2840ILIL Transport Protocol
0x2941IPv6IPv6 Encapsulation (6to4 and 6in4)RFC 2473
0x2A42SDRPSource Demand Routing ProtocolRFC 1940
0x2B43IPv6-RouteRouting Header for IPv6RFC 8200
0x2C44IPv6-FragFragment Header for IPv6RFC 8200
0x2D45IDRPInter-Domain Routing Protocol
0x2E46RSVPResource Reservation ProtocolRFC 2205
0x2F47GREGeneric Routing EncapsulationRFC 2784, RFC 2890
0x3048DSRDynamic Source Routing ProtocolRFC 4728
0x3149BNABurroughs Network Architecture
0x3250ESPEncapsulating Security PayloadRFC 4303
0x3351AHAuthentication HeaderRFC 4302
0x3452I-NLSPIntegrated Net Layer Security ProtocolTUBA
0x3553SwIPeSwIPeRFC 5237
0x3654NARPNBMA Address Resolution ProtocolRFC 1735
0x3755MOBILEIP Mobility (Min Encap)RFC 2004
0x3856TLSPTransport Layer Security Protocol (using Kryptonet key management)
0x3957SKIPSimple Key-Management for Internet ProtocolRFC 2356
0x3A58IPv6-ICMPICMP for IPv6RFC 4443, RFC 4884
0x3B59IPv6-NoNxtNo Next Header for IPv6RFC 8200
0x3C60IPv6-OptsDestination Options for IPv6RFC 8200
0x3D61Any host internal protocol
0x3E62CFTPCFTP
0x3F63Any local network
0x4064SAT-EXPAKSATNET and Backroom EXPAK
0x4165KRYPTOLANKryptolan
0x4266RVDMIT Remote Virtual Disk Protocol
0x4367IPPCInternet Pluribus Packet Core
0x4468Any distributed file system
0x4569SAT-MONSATNET Monitoring
0x4670VISAVISA Protocol
0x4771IPCUInternet Packet Core Utility
0x4872CPNXComputer Protocol Network Executive
0x4973CPHBComputer Protocol Heart Beat
0x4A74WSNWang Span Network
0x4B75PVPPacket Video Protocol
0x4C76BR-SAT-MONBackroom SATNET Monitoring
0x4D77SUN-NDSUN ND PROTOCOL-Temporary
0x4E78WB-MONWIDEBAND Monitoring
0x4F79WB-EXPAKWIDEBAND EXPAK
0x5080ISO-IPInternational Organization for Standardization Internet Protocol
0x5181VMTPVersatile Message Transaction ProtocolRFC 1045
0x5282SECURE-VMTPSecure Versatile Message Transaction ProtocolRFC 1045
0x5383VINESVINES
0x5484TTPTTP (Transaction Transport Protocol) (obsoleted March 2023)
0x5484IPTMInternet Protocol Traffic Manager
0x5585NSFNET-IGPNSFNET-IGP
0x5686DGPDissimilar Gateway Protocol
0x5787TCFTCF
0x5888EIGRPEIGRPInformational RFC 7868
0x5989OSPFOpen Shortest Path FirstRFC 2328
0x5A90Sprite-RPCSprite RPC Protocol
0x5B91LARPLocus Address Resolution Protocol
0x5C92MTPMulticast Transport Protocol
0x5D93AX.25AX.25
0x5E94OSKA9Q NOS compatible IP over IP tunneling
0x5F95MICPMobile Internetworking Control Protocol
0x6096SCC-SPSemaphore Communications Sec. Pro
0x6197ETHERIPEthernet-within-IP EncapsulationRFC 3378
0x6298ENCAPEncapsulation HeaderRFC 1241
0x6399Any private encryption scheme
0x64100GMTPGMTP
0x65101IFMPIpsilon Flow Management Protocol
0x66102PNNIPNNI over IP
0x67103PIMProtocol Independent Multicast
0x68104ARISIBM's ARIS (Aggregate Route IP Switching) Protocol
0x69105SCPSSCPS (Space Communications Protocol Standards)SCPS-TP4
0x6A106QNXQNX
0x6B107A/NActive Networks
0x6C108IPCompIP Payload Compression ProtocolRFC 3173
0x6D109SNPSitara Networks Protocol
0x6E110Compaq-PeerCompaq Peer Protocol
0x6F111IPX-in-IPIPX in IP
0x70112VRRPVirtual Router Redundancy Protocol, Common Address Redundancy Protocol (not IANA assigned)RFC 5798
0x71113PGMPGM Reliable Transport ProtocolRFC 3208
0x72114Any 0-hop protocol
0x73115L2TPLayer Two Tunneling Protocol Version 3RFC 3931
0x74116DDXD-II Data Exchange (DDX)
0x75117IATPInteractive Agent Transfer Protocol
0x76118STPSchedule Transfer Protocol
0x77119SRPSpectraLink Radio Protocol
0x78120UTIUniversal Transport Interface Protocol
0x79121SMPSimple Message Protocol
0x7A122SMSimple Multicast Protocoldraft-perlman-simple-multicast-03
0x7B123PTPPerformance Transparency Protocol
0x7C124IS-IS over IPv4Intermediate System to Intermediate System (IS-IS) Protocol over IPv4RFC 1142 and RFC 1195
0x7D125FIREFlexible Intra-AS Routing Environment
0x7E126CRTPCombat Radio Transport Protocol
0x7F127CRUDPCombat Radio User Datagram
0x80128SSCOPMCEService-Specific Connection-Oriented Protocol in a Multilink and Connectionless EnvironmentITU-T Q.2111 (1999)
0x81129IPLT
0x82130SPSSecure Packet Shield
0x83131PIPEPrivate IP Encapsulation within IPExpired I-D draft-petri-mobileip-pipe-00.txt
0x84132SCTPStream Control Transmission ProtocolRFC 4960
0x85133FCFibre Channel
0x86134RSVP-E2E-IGNOREReservation Protocol (RSVP) End-to-End IgnoreRFC 3175
0x87135Mobility HeaderMobility Extension Header for IPv6RFC 6275
0x88136UDPLiteLightweight User Datagram ProtocolRFC 3828
0x89137MPLS-in-IPMultiprotocol Label Switching Encapsulated in IPRFC 4023, RFC 5332
0x8A138manetMANET ProtocolsRFC 5498
0x8B139HIPHost Identity ProtocolRFC 5201
0x8C140Shim6Site Multihoming by IPv6 IntermediationRFC 5533
0x8D141WESPWrapped Encapsulating Security PayloadRFC 5840
0x8E142ROHCRobust Header CompressionRFC 5856
0x8F143EthernetSegment Routing over IPv6RFC 8986
0x90144AGGFRAGAGGFRAG Encapsulation Payload for ESPRFC 9347
0x91145NSHNetwork Service Headerdraft-ietf-spring-nsh-sr
0x92146HomaHoma transport protocolHoma research paper, HomaModule
0x93147BIT-EMUBit-stream EmulationRFC 9801

Table truncated. See the full table on Wikipedia.

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Contents
Contents4 sections
  • (Top)
  • See also
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  • Rabbit hole

See also

  • EtherType
  • Internet Protocol
    • IPv4 (including packet structure)
    • IPv6 (and packet structure)

References

  1. 1"Protocol Numbers". Internet Assigned Numbers Authority (IANA). 2016-06-22.
  2. 2IEN 158. IETF.
  3. 3IEN 90. IETF.
  4. 4"SPACE COMMUNICATIONS PROTOCOL SPECIFICATION (SCPS)—TRANSPORT PROTOCOL (SCPS-TP)" (PDF). Consultative Committee for Space Data Systems. Archived from the original (PDF) on 2007-09-27. Retrieved 2006-05-27.
Study aids for List of IP protocol numbers

Terminology

IP protocol numbers
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.

Terms the article defines in bold, quoted in context.

Categories:
  • Internet Protocol
  • Internet-related lists
  • Lists of network protocols

95 words · 4 references · revision 1309463808 · CC BY-SA 4.0

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This article
Reading time
9 min
Topic
Computer Science
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2.5k in 14 days
Last edited
4 Sept 2025

Key concepts

  • IPv64
  • IPv4 header1
  • IPv6 header1
  • Bit1
  • Internet Assigned Numbers Authority1
  • Request for Comments1
  • IPv6 Hop-by-Hop Option1
  • Internet Control Message Protocol1
  • Internet Group Management Protocol1
  • Gateway-to-Gateway Protocol1

The articles this one links to most, weighted towards the introduction.

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Created
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Last edited
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263 revisions in total · 161 contributors

  1. 4 Sept 2025, 06:14 UTCScooptaBIT-EMU (proto 147) now has a published RFC, updated the link to go to said RFC−47diff
  2. 29 May 2025, 15:12 UTCDefaultFreeadd class="nomobile" on hex column to address mobile accessibility concerns in Talk:List of IP protocol numbers#HEX numbers+2,602diff
  3. 27 May 2025, 23:42 UTCRafabr34Include newer IANA assignments+427diff
  4. 12 May 2025, 21:58 UTCDefaultFreem{{as of}} MOS:REFPUNCT+5diff
  5. 12 May 2025, 21:38 UTCKvngmark perishable information+10diff
  6. 9 May 2025, 10:06 UTCThe AnomeGMTP, QNX+4diff
  7. 9 May 2025, 10:04 UTCThe Anometweak0diff
  8. 9 May 2025, 10:00 UTCThe Anomelinking one more+4diff

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Created
15 Nov 2004
History
263 edits
161 contributors
No edits in the last 30 days
Last edited
4 Sept 2025

Go deeper: linked from this article

  • Listed under See also

    IPv6

    Version 6 of the Internet Protocol

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

    23 min readGo deeper

  • Linked from the introduction

    Transport Layer Security

    Cryptographic protocols for securing data in transit

    Transport Layer Security (TLS) is a cryptographic protocol designed to provide secured communications over a computer network, such as the Internet.

    66 min readGo deeper

  • Linked from the introduction

    IPsec

    Secure network protocol suite

    In computing, Internet Protocol Security (IPsec) is a secure network protocol suite that authenticates and encrypts packets of data to provide secure encrypted communication between two computers over an Internet Protocol network.

    18 min readGo deeper

  • Listed under See also

    Internet Protocol

    Communication protocol that allows connections between networks

    The Internet Protocol (IP) is the network layer communications protocol in the Internet protocol suite for relaying datagrams across network boundaries.

    8 min readGo deeper

  • Linked from the introduction

    Internet Assigned Numbers Authority

    Standards organization overseeing IP addresses

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

    15 min readGo deeper

  • Linked from the introduction

    Transmission Control Protocol

    Principal protocol used to stream data across an IP network

    The Transmission Control Protocol (TCP) is one of the main protocols of the Internet protocol suite, providing reliable, ordered, and error-checked delivery of a stream of octets (bytes) between applications running on hosts communicating via an IP network.

    42 min readGo deeper

  • Listed under See also

    IPv4

    Fourth version of the Internet Protocol

    Internet Protocol version 4 (IPv4) is the first version of the Internet Protocol (IP) as a standalone specification.

    17 min readGo deeper

  • Linked from the introduction

    Resource Reservation Protocol

    Computer network protocol

    The Resource Reservation Protocol (RSVP) is a transport layer protocol designed to reserve resources across a network using the integrated services model.

    5 min readGo deeper

  • Linked from the introduction

    Generic routing encapsulation

    Cisco tunneling protocol

    Generic routing encapsulation (GRE) is a tunneling protocol developed by Cisco Systems that can encapsulate a wide variety of network layer protocols inside virtual point-to-point links or point-to-multipoint links over an Internet Protocol network.

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  • Linked from the introduction

    Mobile IP

    Internet Engineering Task Force standard communications protocol

    Mobile IP (or MIP) is an Internet Engineering Task Force (IETF) standard communications protocol that is designed to allow mobile device users to move from one network to another while maintaining a permanent IP address.

    4 min readGo deeper

  • Linked from the introduction

    Multiplexing

    Method of combining multiple signals into one signal over a shared medium

    In telecommunications and computer networking, multiplexing (sometimes contracted to muxing) is a method by which multiple analog or digital signals are combined into one signal over a transmission medium.

    8 min readGo deeper

  • Linked from the introduction

    ICMPv6

    Internet protocol used for error messages in network operations

    Internet Control Message Protocol version 6 (ICMPv6) is the implementation of the Internet Control Message Protocol (ICMP) for Internet Protocol version 6 (IPv6).

    6 min readGo deeper

  • Linked from the introduction

    User Datagram Protocol

    Principal protocol used for transmission of datagrams across an IP network

    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 packets) to other hosts on an Internet Protocol (IP) network.

    8 min readGo deeper

  • Linked from the introduction

    PARC Universal Packet

    Early internetworking protocol

    The PARC Universal Packet (PUP or PuP, although the original documents usually use Pup) was one of the two earliest internetworking protocol suites; it was created by researchers at Xerox PARC in the mid-1970s.

    4 min readGo deeper