Appendix F. Well-Known IP Protocol Numbers

A higher-layer protocol is identified with an 8-bit field within an IPv4 packet called Protocol. Figure F-1 shows the IPv4 header format, with the Protocol field shaded. Figure F-2 shows the IPv6 header format, where the protocol number is stored in the shaded Next Header field.

Well-known or assigned IP protocols are registered with the Internet Assigned Numbers Authority (IANA). The information presented here is reproduced with permission from the IANA. For the most current IP protocol number assignment information, refer to http://www.iana.org/numbers.htm under the "Protocol Numbers" link.

Figure F-1. IPv4 Header Format Showing the Protocol Field

graphics/apffig01.gif

Figure F-2. IPv6 Base Header Format Showing the Next Header Field

graphics/apffig02.gif

Table F-1 shows the registered IP protocol numbers, along with the protocol keyword (or acronym), the name of the protocol, and an RFC number (if applicable ).

Table F-1. Registered IP Protocol Numbers, Keywords, Names, and Associated RFCs

Keyword Protocol References	Number
HOPOPT IPv6 Hop-by-Hop Option RFC 1883
ICMP Internet Control Message RFC 792	1
IGMP Internet Group Management RFC 1112	2
GGP Gateway-to-Gateway RFC 823	3
IP IP in IP (encapsulation) RFC 2003	4
ST Stream RFC 1190, RFC 1819	5
TCP Transmission Control RFC 793	6
CBT CBT	7
EGP Exterior Gateway Protocol RFC 888	8
IGP any private interior gateway IANA (used by Cisco for IGRP)	9
BBN-RCC-MON BBN RCC Monitoring	10
NVP-II Network Voice Protocol RFC 741	11
PUP PUP	12
ARGUS ARGUS	13
EMCON EMCON	14
XNET Cross Net Debugger	15
CHAOS Chaos	16
UDP User Datagram RFC 768	17
MUX Multiplexing	18
DCN-MEAS DCN Measurement Subsystems	19
HMP Host Monitoring RFC 869	20
PRM Packet Radio Measurement	21
XNS-IDP XEROX NS IDP	22
TRUNK-1 Trunk-1	23
TRUNK-2 Trunk-2	24
LEAF-1 Leaf-1	25
LEAF-2 Leaf-2	26
RDP Reliable Data Protocol RFC 908	27
IRTP Internet Reliable Transaction RFC 938	28
ISO-TP4 ISO Transport Protocol Class 4 RFC 905	29
NETBLT Bulk Data Transfer Protocol RFC 969	30
MFE-NSP MFE Network Services Protocol	31
MERIT-INP MERIT Internodal Protocol	32
SEP Sequential Exchange Protocol	33
3PC Third-Party Connect Protocol	34
IDPR Inter-Domain Policy Routing Protocol	35
XTP XTP	36
DDP Datagram Delivery Protocol	37
IDPR-CMTP IDPR Control Message Transport Protocol	38
TP++ TP++ Transport Protocol	39
IL IL Transport Protocol	40
IPv6 Ipv6	41
SDRP Source Demand Routing Protocol	42
IPv6-Route Routing Header for IPv6	43
IPv6-Frag Fragment Header for IPv6	44
IDRP Inter-Domain Routing Protocol	45
RSVP Reservation Protocol	46
GRE General Routing Encapsulation	47
MHRP Mobile Host Routing Protocol	48
BNA BNA	49
ESP Encap Security Payload for IPv6 RFC 1827	50
AH Authentication Header for IPv6 RFC 1826	51
I-NLSP Integrated Net Layer Security TUBA	52
SWIPE IP with Encryption	53
NARP NBMA Address Resolution Protocol RFC 1735	54
MOBILE IP Mobility	55
TLSP Transport Layer Security Protocol using Kryptonet key management	56
SKIP SKIP	57
IPv6-ICMP ICMP for IPv6 RFC 1883	58
IPv6-NoNxt No Next Header for IPv6 RFC 1883	59
IPv6-Opts Destination Options for IPv6 RFC 1883	60
any host internal protocol IANA	61
CFTP CFTP	62
any local network IANA	63
SAT-EXPAK SATNET and Backroom EXPAK	64
KRYPTOLAN Kryptolan	65
RVD MIT Remote Virtual Disk Protocol	66
IPPC Internet Pluribus Packet Core	67
any distributed file system IANA	68
SAT-MON SATNET Monitoring	69
VISA VISA Protocol	70
IPCV Internet Packet Core Utility	71
CPNX Computer Protocol Network Executive	72
CPHB Computer Protocol Heart Beat	73
WSN Wang Span Network	74
PVP Packet Video Protocol	75
BR-SAT-MON Backroom SATNET Monitoring	76
SUN-ND SUN ND PROTOCOL-Temporary	77
WB-MON WIDEBAND Monitoring	78
WB-EXPAK WIDEBAND EXPAK	79
ISO-IP ISO Internet Protocol	80
VMTP VMTP	81
SECURE-VMTP SECURE-VMTP	82
VINES VINES	83
TTP TTP	84
NSFNET-IGP NSFNET-IGP	85
DGP Dissimilar Gateway Protocol	86
TCF TCF	87
EIGRP EIGRP CISCO	88
OSPFIGP OSPFIGP RFC 1583	89
Sprite-RPC Sprite RPC Protocol	90
LARP Locus Address Resolution Protocol	91
MTP Multicast Transport Protocol	92
AX.25 AX.25 Frames	93
IPIP IP-within-IP Encapsulation Protocol	94
MICP Mobile Internetworking Control Pro.	95
SCC-SP Semaphore Communications Sec. Pro.	96
ETHERIP Ethernet-within-IP Encapsulation	97
ENCAP Encapsulation Header RFC 1241	98
any private encryption scheme IANA	99
GMTP GMTP	100
IFMP Ipsilon Flow Management Protocol	101
PNNI PNNI over IP	102
PIM Protocol Independent Multicast	103
ARIS ARIS	104
SCPS SCPS	105
QNX QNX	106
A/N Active Networks	107
IPComp IP Payload Compression Protocol RFC 2393	108
SNP Sitara Networks Protocol	109
Compaq-Peer Compaq Peer Protocol	110
IPX-in-IP IPX in IP	111
VRRP Virtual Router Redundancy Protocol	112
PGM PGM Reliable Transport Protocol	113
any 0-hop protocol IANA	114
L2TP Layer Two Tunneling Protocol	115
DDX D-II Data Exchange (DDX)	116
IATP Interactive Agent Transfer Protocol	117
STP Schedule Transfer Protocol	118
SRP SpectraLink Radio Protocol	119
UTI UTI	120
SMP Simple Message Protocol	121
SM SM	122
PTP Performance Transparency Protocol	123
ISIS over IPv4	124
FIRE	125
CRTP Combat Radio Transport Protocol	126
CRUDP Combat Radio User Datagram	127
SSCOPMCE	128
IPLT	129
SPS Secure Packet Shield	130
PIPE Private IP Encapsulation within IP	131
SCTP Stream Control Transmission Protocol	132
FC Fibre Channel	133
Unassigned IANA	134 “254
Reserved IANA	255