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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