Protocol Field of the IPv4 Header

 

In the Internet Protocol version 4 ( IPv4 ) [ RFC 791 ] there is a field, called "Protocol", to identify the next level protocol. This is an 8 bit field.

 
0 HOPOPT IPv6 Hop-by-Hop Option [ RFC 1883 ]
1 ICMP Internet Control Message [ RFC 792 ]
2 IGMP Internet Group Management [ RFC 1112 ]
3 GGP Gateway-to-Gateway [ RFC 823 ]
4 IP IP in IP (encapsulation) [ RFC 2003 ]
5 ST Stream [ RFC 1190 ] [ RFC 1819 ] 
6 TCP Transmission Control [ RFC 793 ]
7 CBT CBT  
8 EGP Exterior Gateway Protocol [ RFC 888 ]
9 IGP any private interior gateway ( IGRP ) [ IANA ]
10 BBN-RCC-MON BBN RCC Monitoring  
11 NVP-II Network Voice Protocol [ RFC 741 ]
12 PUP PUP  
13 ARGUS ARGUS  
14 EMCON EMCON  
15 XNET Cross Net Debugger  
16 CHAOS Chaos   
17 UDP User Datagram [ RFC 768 ]
18 MUX Multiplexing  
19 DCN-MEAS DCN Measurement Subsystems  
20 HMP Host Monitoring  [ RFC 869 ]
21 PRM Packet Radio Measurement  
22 XNS-IDP XEROX NS IDP  
23 TRUNK-1 Trunk-1  
24 TRUNK-2 Trunk-2  
25 LEAF-1 Leaf-1  
26 LEAF-2 Leaf-2  
27 RDP Reliable Data Protocol [ RFC 908 ]
28 IRTP Internet Reliable Transaction [ RFC 938 ]
29 ISO-TP4 ISO Transport Protocol Class 4 [ RFC 905 ]
30 NETBLT Bulk Data Transfer Protocol [ RFC 969 ]
31 MFE-NSP MFE Network Services Protocol  
32 MERIT-INP MERIT Internodal Protocol  
33 SEP Sequential Exchange Protocol  
34 3PC Third Party Connect Protocol  
35 IDPR Inter-Domain Policy Routing Protocol  
36 XTP XTP  
37 DDP Datagram Delivery Protocol  
38 IDPR-CMTP IDPR Control Message Transport Protocol  
39 TP++ TP++ Transport Protocol  
40 IL IL Transport Protocol  
41 IPv6 IPv6  
42 SDRP Source Demand Routing Protocol  
43 IPv6-Route Routing Header for IPv6  
44 IPv6-Frag Fragment Header for IPv6  
45 IDRP Inter-Domain Routing Protocol  
46 RSVP Reservation Protocol  
47 GRE General Routing Encapsulation  
48 MHRP Mobile Host Routing Protocol  
49 BNA BNA  
50 ESP Encap Security Payload [ RFC 2406 ]
51 AH Authentication Header [ RFC 2402 ]
52 I-NLSP Integrated Net Layer Security  
53 SWIPE IP with Encryption  
54 NARP NBMA Address Resolution Protocol [ RFC 1735 ]
55 MOBILE IP Mobility  
56 TLSP Transport Layer Security Protocol  
57 SKIP SKIP  
58 IPv6-ICMP ICMP for IPv6 [ RFC 1883 ]
59 IPv6-NoNxt No Next Header for IPv6 [ RFC 1883 ]
60 IPv6-Opts Destination Options for IPv6 [ RFC 1883 ]
61   any host internal protocol [ IANA ]
62 CFTP CFTP  
63   any local network [ IANA ]
64 SAT-EXPAK SATNET and Backroom EXPAK  
65 KRYPTOLAN Kryptolan  
66 RVD MIT Remote Virtual Disk Protocol  
67 IPPC Internet Pluribus Packet Core  
68   any distributed file system [ IANA ]
69 SAT-MON SATNET Monitoring  
70 VISA VISA Protocol  
71 IPCV Internet Packet Core Utility  
72 CPNX Computer Protocol Network Executive  
73 CPHB Computer Protocol Heart Beat  
74 WSN Wang Span Network  
75 PVP Packet Video Protocol  
76 BR-SAT-MON Backroom SATNET Monitoring  
77 SUN-ND SUN ND PROTOCOL-Temporary  
78 WB-MON WIDEBAND Monitoring  
79 WB-EXPAK WIDEBAND EXPAK  
80 ISO-IP ISO Internet Protocol  
81 VMTP VMTP  
82 SECURE-VMTP SECURE-VMTP  
83 VINES VINES  
84 TTP TTP  
85 NSFNET-IGP NSFNET-IGP  
86 DGP Dissimilar Gateway Protocol  
87 TCF TCF  
88 EIGRP EIGRP  
89 OSPFIGP OSPFIGP [ RFC 1583 ]
90 Sprite-RPC Sprite RPC Protocol  
91 LARP Locus Address Resolution Protocol  
92 MTP Multicast Transport Protocol  
93 AX.25 AX.25 Frames  
94 IPIP IP-within-IP Encapsulation Protocol  
95 MICP Mobile Internetworking Control Protocol  
96 SCC-SP Semaphore Communications Sec.  
97 ETHERIP Ethernet-within-IP Encapsulation [ RFC 3378 ]
98 ENCAP Encapsulation Header [ RFC 1241 ]
99   any private encryption scheme [ IANA ]
100 GMTP GMTP  
101 IFMP Ipsilon Flow Management Protocol  
102 PNNI PNNI over IP  
103 PIM Protocol Independent Multicast  
104 ARIS ARIS  
105 SCPS SCPS  
106 QNX QNX  
107 A/ N Active Networks  
108 IPComp IP Payload Compression Protocol [ RFC 2393 ]
109 SNP Sitara Networks Protocol  
110 Compaq-Peer Compaq Peer Protocol  
111 IPX-in-IP IPX in IP  
112 VRRP Virtual Router Redundancy Protocol [ RFC 3768 ]
113 PGM PGM Reliable Transport Protocol  
114   any 0-hop protocol [ IANA ]
115 L2TP Layer Two Tunneling Protocol  
116 DDX D-II Data Exchange ( DDX )  
117 IATP Interactive Agent Transfer Protocol  
118 STP Schedule Transfer Protocol  
119 SRP SpectraLink Radio Protocol  
120 UTI UTI  
121 SMP Simple Message Protocol  
122 SM SM  
123 PTP Performance Transparency Protocol  
124   ISIS over IPv4  
125 FIRE FIRE  
126 CRTP Combat Radio Transport Protocol  
127 CRUDP Combat Radio User Datagram  
128 SSCOPMCE SSCOPMCE  
129 IPLT IPLT  
130 SPS Secure Packet Shield  
131 PIPE Private IP Encapsulation within IP  
132 SCTP Stream Control Transmission Protocol  
133 FC Fibre Channel  
134   RSVP-E2E-IGNORE [ RFC 3175 ]
135   Mobility Header [ RFC 3775 ]
136   UDPLite [ RFC 3828 ]
137   MPLS-in-IP  
       
138 - 252   Unassigned [ IANA ]
       
253   Use for experimentation and testing [ RFC 3692 ]
254   Use for experimentation and testing [ RFC 3692 ]
255   Reserved [ IANA ]
       

 

For more detailed information about the protocol numbers, check the document "PROTOCOL NUMBERS" on the IANA Site .

 

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