This is a list of the IP protocol numbers found in the field ''Protocol'' of the

IPv4 header Internet Protocol version 4 (IPv4) is the fourth version of the Internet Protocol (IP). It is one of the core protocols of standards-based internetworking methods in the Internet and other packet-switched networks. IPv4 was the first version de ...

and the ''Next Header'' field of the

IPv6 header An IPv6 packet is the smallest message entity exchanged using Internet Protocol version 6 (IPv6). Packets consist of control information for addressing and routing and a payload of user data. The control information in IPv6 packets is subdivided i ...

. It is an identifier for the encapsulated protocol and determines the layout of the data that immediately follows the header. Both fields are eight

bit The bit is the most basic unit of information in computing and digital communications. The name is a portmanteau of binary digit. The bit represents a logical state with one of two possible values. These values are most commonly represented a ...

s wide. 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 number allocation, root zone management in the Domain Name System (DNS), media types, and other Internet ...

(IANA). {, class="wikitable" , - ! Hex ! Protocol Number !! Keyword !! Protocol !! References/ RFC , - , 0x00 , 0 , HOPOPT ,

IPv6 Hop-by-Hop Option An IPv6 packet is the smallest message entity exchanged using Internet Protocol version 6 (IPv6). Packets consist of control information for addressing and routing and a payload of user data. The control information in IPv6 packets is subdivided ...

, , - , 0x01 , 1 , ICMP ,

Internet Control Message Protocol The Internet Control Message Protocol (ICMP) is a supporting protocol in the Internet protocol suite. It is used by network devices, including routers, to send error messages and operational information indicating success or failure when commu ...

, , - , 0x02 , 2 , IGMP ,

Internet Group Management Protocol The Internet Group Management Protocol (IGMP) is a communications protocol used by hosts and adjacent routers on IPv4 networks to establish multicast group memberships. IGMP is an integral part of IP multicast and allows the network to direc ...

, , - , 0x03 , 3 , GGP , Gateway-to-Gateway Protocol , , - , 0x04 , 4 , IP-in-IP ,

IP in IP IP in IP is an IP tunneling protocol that encapsulates one IP packet in another IP packet. To encapsulate an IP packet in another IP packet, an outer header is added with Source IP, the entry point of the tunnel, and Destination IP, the exit point ...

(encapsulation) , , - , 0x05 , 5 , ST ,

Internet Stream Protocol The Internet Stream Protocol (ST) is a family of experimental protocols first defined in Internet Experiment Note IEN-119 in 1979, and later substantially revised in RFC 1190 (ST-II) and RFC 1819 (ST2+). The protocol uses the version number 5 in ...

, , , - , 0x06 , 6 , TCP ,

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

, , - , 0x07 , 7 , CBT , Core-based trees , , - , 0x08 , 8 , EGP ,

Exterior Gateway Protocol An exterior gateway protocol is an IP routing protocol used to exchange routing information between autonomous systems. This exchange is crucial for communications across the Internet. Notable exterior gateway protocols include Exterior Gatewa ...

, , - , 0x09 , 9 , IGP ,

Interior Gateway Protocol An interior gateway protocol (IGP) or Interior routing protocol is a type of routing protocol used for exchanging routing table information between gateways (commonly routers) ''within'' an autonomous system (for example, a system of corpora ...

(any private interior gateway, for example Cisco's

IGRP Interior Gateway Routing Protocol (IGRP) is a distance vector interior gateway protocol (IGP) developed by Cisco. It is used by routers to exchange routing data within an autonomous system. IGRP is a proprietary protocol. IGRP was created in p ...

) , , - , 0x0A , 10 , BBN-RCC-MON , BBN RCC Monitoring , , - , 0x0B , 11 , NVP-II ,

Network Voice Protocol The Network Voice Protocol (NVP) was a pioneering computer network protocol for transporting human speech over packetized communications networks. It was an early example of Voice over Internet Protocol technology. History NVP was first defin ...

, , - , 0x0C , 12 , PUP , Xerox PUP , , - , 0x0D , 13 , ARGUS , ARGUS , , - , 0x0E , 14 , EMCON , EMCON , , - , 0x0F , 15 , XNET , Cross Net Debugger , IEN 158 , - , 0x10 , 16 , CHAOS ,

Chaos Chaos or CHAOS may refer to: Arts, entertainment and media Fictional elements * Chaos (''Kinnikuman'') * Chaos (''Sailor Moon'') * Chaos (''Sesame Park'') * Chaos (''Warhammer'') * Chaos, in ''Fabula Nova Crystallis Final Fantasy'' * Cha ...

, , - , 0x11 , 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 packets) to other hosts on an Internet Protocol (IP) networ ...

, , - , 0x12 , 18 , MUX ,

Multiplexing 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 shared medium. The aim is to share a scarce resource - a ...

, IEN 90 , - , 0x13 , 19 , DCN-MEAS , DCN Measurement Subsystems , , - , 0x14 , 20 , HMP , Host Monitoring Protocol , , - , 0x15 , 21 , PRM , Packet Radio Measurement , , - , 0x16 , 22 , XNS-IDP , XEROX NS IDP , , - , 0x17 , 23 , TRUNK-1 , Trunk-1 , , - , 0x18 , 24 , TRUNK-2 , Trunk-2 , , - , 0x19 , 25 , LEAF-1 , Leaf-1 , , - , 0x1A , 26 , LEAF-2 , Leaf-2 , , - , 0x1B , 27 , RDP ,

Reliable Data Protocol The Reliable Data Protocol (RDP) is a network transport protocol defined iRFC 908and was updated iRFC 1151 It is meant to provide facilities for remote loading, debugging and bulk transfer of images and data. The Reliable Data Protocol is locate ...

, , - , 0x1C , 28 , IRTP ,

Internet Reliable Transaction Protocol The Internet (or internet) is the global system of interconnected computer networks that uses the Internet protocol suite (TCP/IP) to communicate between networks and devices. It is a '' network of networks'' that consists of private, p ...

, , - , 0x1D , 29 , ISO-TP4 , ISO Transport Protocol Class 4 , , - , 0x1E , 30 , NETBLT , Bulk Data Transfer Protocol , , - , 0x1F , 31 , MFE-NSP , MFE Network Services Protocol , , - , 0x20 , 32 , MERIT-INP ,

MERIT Internodal Protocol Merit may refer to: Religion * Merit (Christianity) * Merit (Buddhism) * Punya (Hinduism) * Imputed righteousness in Reformed Christianity Companies and brands * Merit (cigarette), a brand of cigarettes made by Altria * Merit Energy Compan ...

, , - , 0x21 , 33 , DCCP ,

Datagram Congestion Control Protocol In computer networking, the Datagram Congestion Control Protocol (DCCP) is a message-oriented transport layer protocol. DCCP implements reliable connection setup, teardown, Explicit Congestion Notification (ECN), congestion control, and featu ...

, , - , 0x22 , 34 , 3PC ,

Third Party Connect Protocol Third or 3rd may refer to: Numbers * 3rd, the ordinal form of the cardinal number 3 * , a fraction of one third * 1⁄60 of a ''second'', or 1⁄3600 of a ''minute'' Places * 3rd Street (disambiguation) * Third Avenue (disambiguation) * Hi ...

, , - , 0x23 , 35 , IDPR ,

Inter-Domain Policy Routing Protocol Inter-domain routing is data flow control and interaction between Primary Domain Controller (PDC) computers. This type of computer uses various computer protocols and services to operate. It is most commonly used to multicast between internet d ...

, , - , 0x24 , 36 , XTP , Xpress Transport Protocol , , - , 0x25 , 37 , DDP ,

Datagram Delivery Protocol Datagram Delivery Protocol (DDP) is a member of the AppleTalk networking protocol suite. Its main responsibility is for socket-to-socket delivery of datagrams over an AppleTalk network. *Note: All application-level protocols, including the infrast ...

, , - , 0x26 , 38 , IDPR-CMTP , IDPR Control Message Transport Protocol , , - , 0x27 , 39 , TP++ , TP++ Transport Protocol , , - , 0x28 , 40 , IL , IL Transport Protocol , , - , 0x29 , 41 , IPv6 , IPv6 Encapsulation (

6to4 6to4 is an Internet transition mechanism for migrating from Internet Protocol version 4 (IPv4) to version 6 (IPv6) and a system that allows IPv6 packets to be transmitted over an IPv4 network (generally the IPv4 Internet) without the need to c ...

and

6in4 6in4 is an IPv6 transition mechanism for migrating from Internet Protocol version 4 (IPv4) to IPv6. It is a tunneling protocol that encapsulates IPv6 packets on specially configured IPv4 links according to the specifications of . The IP protocol ...

) , , - , 0x2A , 42 , SDRP , Source Demand Routing Protocol , , - , 0x2B , 43 , IPv6-Route , Routing Header for

IPv6 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. I ...

, , - , 0x2C , 44 , IPv6-Frag , Fragment Header for

, , - , 0x2D , 45 , IDRP ,

Inter-Domain Routing Protocol Inter-domain routing is data flow control and interaction between Primary Domain Controller (PDC) computers. This type of computer uses various computer protocols and services to operate. It is most commonly used to multicast between internet doma ...

, , - , 0x2E , 46 , RSVP , Resource Reservation Protocol , , - , 0x2F , 47 , GRE ,

Generic Routing Encapsulation 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 net ...

, , , - , 0x30 , 48 , DSR ,

Dynamic Source Routing Dynamic Source Routing (DSR) is a routing protocol for wireless mesh networks. It is similar to AODV in that it forms a route on-demand when a transmitting node requests one. However, it uses source routing instead of relying on the routing ta ...

Protocol , , - , 0x31 , 49 , BNA , Burroughs Network Architecture , , - , 0x32 , 50 , ESP ,

Encapsulating Security Payload 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. It is used in ...

, , - , 0x33 , 51 , AH , Authentication Header , , - , 0x34 , 52 , I-NLSP ,

Integrated Net Layer Security Protocol Integration may refer to: Biology *Multisensory integration *Path integration * Pre-integration complex, viral genetic material used to insert a viral genome into a host genome *DNA integration, by means of site-specific recombinase technology, ...

, TUBA , - , 0x35 , 53 , SwIPe , SwIPe , , - , 0x36 , 54 , NARP ,

NBMA Address Resolution Protocol A non-broadcast multiple access network (NBMA) is a computer network to which multiple hosts are attached, but data is transmitted only directly from one computer to another single host over a virtual circuit or across a switched fabric. Examples ...

, , - , 0x37 , 55 , MOBILE , IP Mobility (Min Encap) , , - , 0x38 , 56 , TLSP , Transport Layer Security Protocol (using Kryptonet key management) , , - , 0x39 , 57 , SKIP ,

Simple Key-Management for Internet Protocol Simple Key-Management for Internet Protocol or SKIP was a protocol developed circa 1995 by the IETF Security Working Group for the sharing of encryption keys. SKIP and Photuris were evaluated as key exchange mechanisms for IPsec before the adoptio ...

, , - , 0x3A , 58 , IPv6-ICMP , ICMP for IPv6 , , , - , 0x3B , 59 , IPv6-NoNxt , No Next Header for

, , - , 0x3C , 60 , IPv6-Opts , Destination Options for

, , - , 0x3D , 61 , , Any host internal protocol , , - , 0x3E , 62 , CFTP , CFTP , , - , 0x3F , 63 , , Any local network , , - , 0x40 , 64 , SAT-EXPAK , SATNET and Backroom EXPAK , , - , 0x41 , 65 , KRYPTOLAN , Kryptolan , , - , 0x42 , 66 , RVD , MIT Remote Virtual Disk Protocol , , - , 0x43 , 67 , IPPC , Internet Pluribus Packet Core , , - , 0x44 , 68 , , Any distributed file system , , - , 0x45 , 69 , SAT-MON , SATNET Monitoring , , - , 0x46 , 70 , VISA , VISA Protocol , , - , 0x47 , 71 , IPCU , Internet Packet Core Utility , , - , 0x48 , 72 , CPNX , Computer Protocol Network Executive , , - , 0x49 , 73 , CPHB ,

Computer Protocol Heart Beat A computer is a machine that can be programmed to carry out sequences of arithmetic or logical operations (computation) automatically. Modern digital electronic computers can perform generic sets of operations known as programs. These progra ...

, , - , 0x4A , 74 , WSN ,

Wang Span Network Wang may refer to: Names * Wang (surname) (王), a common Chinese surname * Wāng (汪), a less common Chinese surname * Titles in Chinese nobility * A title in Korean nobility * A title in Mongolian nobility Places * Wang River in Thailand ...

, , - , 0x4B , 75 , PVP , Packet Video Protocol , , - , 0x4C , 76 , BR-SAT-MON , Backroom SATNET Monitoring , , - , 0x4D , 77 , SUN-ND , SUN ND PROTOCOL-Temporary , , - , 0x4E , 78 , WB-MON , WIDEBAND Monitoring , , - , 0x4F , 79 , WB-EXPAK , WIDEBAND EXPAK , , - , 0x50 , 80 , ISO-IP , International Organization for Standardization Internet Protocol , , - , 0x51 , 81 , VMTP , Versatile Message Transaction Protocol , , - , 0x52 , 82 , SECURE-VMTP , Secure Versatile Message Transaction Protocol , , - , 0x53 , 83 , VINES , VINES , , - , 0x54 , 84 , TTP , TTP , , - , 0x54 , 84 , IPTM ,

Internet Protocol Traffic Manager The Internet (or internet) is the global system of interconnected computer networks that uses the Internet protocol suite (TCP/IP) to communicate between networks and devices. It is a '' network of networks'' that consists of private, pu ...

, , - , 0x55 , 85 , NSFNET-IGP , NSFNET-IGP , , - , 0x56 , 86 , DGP , Dissimilar Gateway Protocol , , - , 0x57 , 87 , TCF , TCF , , - , 0x58 , 88 , EIGRP ,

EIGRP Enhanced Interior Gateway Routing Protocol (EIGRP) is an advanced distance-vector routing protocol that is used on a computer network for automating routing decisions and configuration. The protocol was designed by Cisco Systems as a proprietary pr ...

, Informational , - , 0x59 , 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 ...

, , - , 0x5A , 90 , Sprite-RPC , Sprite RPC Protocol , , - , 0x5B , 91 , LARP , Locus Address Resolution Protocol , , - , 0x5C , 92 , MTP , Multicast Transport Protocol , , - , 0x5D , 93 , AX.25 ,

AX.25 AX.25 (Amateur X.25) is a data link layer protocol originally derived from layer 2 of the X.25 protocol suite and designed for use by amateur radio operators. It is used extensively on amateur packet radio networks. AX.25 v2.0 and later occupies ...

, , - , 0x5E , 94 , OS , KA9Q NOS compatible IP over IP tunneling , , - , 0x5F , 95 , MICP , Mobile Internetworking Control Protocol , , - , 0x60 , 96 , SCC-SP , Semaphore Communications Sec. Pro , , - , 0x61 , 97 , ETHERIP , Ethernet-within-IP Encapsulation , , - , 0x62 , 98 , ENCAP , Encapsulation Header , , - , 0x63 , 99 , , Any private encryption scheme , , - , 0x64 , 100 , GMTP , GMTP , , - , 0x65 , 101 , IFMP ,

Ipsilon Flow Management Protocol Ipsilon may refer to: *Ipsilon Networks, a defunct company *The Greek letter upsilon *The Latin letter Y *The Fedora Project The Fedora Project is an independent project to co-ordinate the development of Fedora Linux, a Linux-based operating ...

, , - , 0x66 , 102 , PNNI , PNNI over IP , , - , 0x67 , 103 , PIM ,

Protocol Independent Multicast 400px, Example of a multicast network architecture Protocol-Independent Multicast (PIM) is a family of multicast routing protocols for Internet Protocol (IP) networks that provide one-to-many and many-to-many distribution of data over a LAN, WA ...

, , - , 0x68 , 104 , ARIS , IBM's ARIS (Aggregate Route IP Switching) Protocol , , - , 0x69 , 105 , SCPS , SCPS (Space Communications Protocol Standards) , SCPS-TP , - , 0x6A , 106 ,

QNX QNX ( or ) is a commercial Unix-like real-time operating system, aimed primarily at the embedded systems market. QNX was one of the first commercially successful microkernel operating systems. The product was originally developed in the early 19 ...

, QNX , , - , 0x6B , 107 , A/N , Active Networks , , - , 0x6C , 108 , IPComp , IP Payload Compression Protocol , , - , 0x6D , 109 , SNP , Sitara Networks Protocol , , - , 0x6E , 110 , Compaq-Peer , Compaq Peer Protocol , , - , 0x6F , 111 , IPX-in-IP , IPX in IP , , - , 0x70 , 112 , VRRP , Virtual Router Redundancy Protocol, Common Address Redundancy Protocol (not

IANA 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 System (DNS), media types, and other Interne ...

assigned) , , - , 0x71 , 113 , PGM , PGM Reliable Transport Protocol , , - , 0x72 , 114 , , Any 0-hop protocol , , - , 0x73 , 115 , L2TP , Layer Two Tunneling Protocol Version 3 , , - , 0x74 , 116 , DDX , D-II Data Exchange (DDX) , , - , 0x75 , 117 , IATP ,

Interactive Agent Transfer Protocol Across the many fields concerned with interactivity, including information science, computer science, human-computer interaction, communication, and industrial design, there is little agreement over the meaning of the term "interactivity", but mo ...

, , - , 0x76 , 118 , STP , Schedule Transfer Protocol , , - , 0x77 , 119 , SRP , SpectraLink Radio Protocol , , - , 0x78 , 120 , UTI , Universal Transport Interface Protocol , , - , 0x79 , 121 , SMP , Simple Message Protocol , , - , 0x7A , 122 , SM , Simple Multicast Protocol
draft-perlman-simple-multicast-03
, - , 0x7B , 123 , PTP ,

Performance Transparency Protocol A performance is an act of staging or presenting a play, concert, or other form of entertainment. It is also defined as the action or process of carrying out or accomplishing an action, task, or function. Management science In the work place ...

, , - , 0x7C , 124 , IS-IS over IPv4 , Intermediate System to Intermediate System (IS-IS) Protocol over

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

, and , - , 0x7D , 125 , FIRE , Flexible Intra-AS Routing Environment , , - , 0x7E , 126 , CRTP ,

Combat Radio Transport Protocol Combat (French for ''fight'') is a purposeful violent conflict meant to physically harm or kill the opposition. Combat may be armed (using weapons) or unarmed ( not using weapons). Combat is sometimes resorted to as a method of self-defense, or ...

, , - , 0x7F , 127 , CRUDP ,

Combat Radio User Datagram Combat (French for ''fight'') is a purposeful violent conflict meant to physically harm or kill the opposition. Combat may be armed (using weapons) or unarmed ( not using weapons). Combat is sometimes resorted to as a method of self-defense, ...

, , - , 0x80 , 128 , SSCOPMCE , Service-Specific Connection-Oriented Protocol in a Multilink and Connectionless Environment
ITU-T Q.2111 (1999)
, - , 0x81 , 129 , IPLT , , , - , 0x82 , 130 , SPS ,

Secure Packet Shield Secure may refer to: * Security, being protected against danger or loss(es) **Physical security, security measures that are designed to deny unauthorized access to facilities, equipment, and resources **Information security, defending information ...

, , - , 0x83 , 131 , PIPE , Private IP Encapsulation within IP
Expired I-D draft-petri-mobileip-pipe-00.txt
, - , 0x84 , 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 p ...

, , - , 0x85 , 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 servers in storage area networks (SAN) in commercial data c ...

, , - , 0x86 , 134 , RSVP-E2E-IGNORE , Reservation Protocol (RSVP) End-to-End Ignore , , - , 0x87 , 135 , Mobility Header , Mobility Extension Header for IPv6 , , - , 0x88 , 136 , UDPLite , Lightweight User Datagram Protocol , , - , 0x89 , 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 identi ...

Encapsulated in IP , , , - , 0x8A , 138 , manet ,

MANET A wireless ad hoc network (WANET) or mobile ad hoc network (MANET) is a decentralized type of wireless network. The network is ad hoc because it does not rely on a pre-existing infrastructure, such as routers in wired networks or access point ...

Protocols , , - , 0x8B , 139 , HIP ,

Host Identity Protocol The Host Identity Protocol (HIP) is a host identification technology for use on Internet Protocol (IP) networks, such as the Internet. The Internet has two main name spaces, IP addresses and the Domain Name System. HIP separates the end-point ide ...

, , - , 0x8C , 140 , Shim6 ,

Site Multihoming by IPv6 Intermediation The Site Multihoming by IPv6 Intermediation (SHIM6) protocol is an Internet Layer defined in RFC 5533. Architecture The SHIM6 architecture defines failure detection and locator pair exploration functions. The first is used to detect outages throug ...

, , - , 0x8D , 141 , WESP , Wrapped Encapsulating Security Payload , , - , 0x8E , 142 , ROHC ,

Robust Header Compression Robust Header Compression (ROHC) is a standardized method to compress the IP, UDP, UDP-Lite, RTP, and TCP headers of Internet packets. The need for header compression In streaming applications, the overhead of IP, UDP, and RTP is 40 bytes f ...

, , - , 0x8F , 143 , Ethernet , IPv6 Segment Routing (TEMPORARY - registered 2020-01-31, expired 2021-01-31) , , -- , 0x90-0xFC , 144-252 , colspan="2", Unassigned , , - , 0xFD-0xFE , 253-254 , colspan="2", Use for experimentation and testing , {{IETF RFC, 3692, link=no , - , 0xFF , 255 , colspan="2", Reserved ,

References

Internet Protocol IPv4 protocol numbers. IP protocol numbers

See also

References