IP Protocols

Number Keyword Protocol RFC
Decimal Hexadecimal
0 0x00 HOPOPT IPv6 Hop-by-Hop Option RFC 8200
1 0x01 ICMP Internet Control Message Protocol RFC 792
2 0x02 IGMP Internet Group Management Protocol RFC 1112
3 0x03 GGP Gateway-to-Gateway Protocol RFC 823
4 0x04 IP-in-IP IP Encapsulation within IP RFC 2003
5 0x05 ST Internet Stream Protocol RFC 1190
6 0x06 TCP Transmission Control Protocol RFC 793
7 0x07 CBT Core Based Trees RFC 2189
8 0x08 EGP Exterior Gateway Protocol RFC 888
9 0x09 IGP Interior Gateway Protocol  
10 0x0A BBN-RCC-MON BBN RCC Monitoring  
11 0x0B NVP Network Voice Protocol RFC 741
12 0x0C PUP Xerox PUP  
13 0x0D ARGUS ARGUS  
14 0x0E EMCON EMCON  
15 0x0F XNET Cross Net Debugger IEN 158
16 0x10 CHAOS Chaos  
17 0x11 UDP User Datagram Protocol RFC 768
18 0x12 MUX Multiplexing IEN 90
19 0x13 DCN-MEAS DCN Measurement Subsystems  
20 0x14 HMP Host Monitoring Protocol RFC 869
21 0x15 PRM Packet Radio Measurement  
22 0x16 XNS-IDP XEROX NS IDP  
23 0x17 TRUNK-1 Trunk-1  
24 0x18 TRUNK-2 Trunk-2  
25 0x19 LEAF-1 Leaf-1  
26 0x1A LEAF-2 Leaf-2  
27 0x1B RDP Reliable Data Protocol RFC 908
28 0x1C IRTP Internet Reliable Transaction Protocol RFC 938
29 0x1D ISO-TP ISO Transport Protocol RFC 905
30 0x1E NETBLT Bulk Data Transfer Protocol RFC 998
31 0x1F MFE-NSP MFE Network Services Protocol  
32 0x20 MERIT-INP MERIT Internodal Protocol  
33 0x21 DCCP Datagram Congestion Control Protocol RFC 4340
34 0x22 3PC Third Party Connect Protocol  
35 0x22 IDPR Inter-Domain Policy Routing Protocol RFC 14798
36 0x24 XTP Xpress Transport Protocol  
37 0x25 DDP Datagram Delivery Protocol  
38 0x26 IDPR-CMTP IDPR Control Message Transport Protocol  
39 0x27 TP++ TP++ Transport Protocol  
40 0x28 IL IL Transport Protocol  
41 0x29 IPv6 IPv6 encapsulation RFC X
422 0x2A SDRP Source Demand Routing Protocol RFC 1940
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IANA Protocol Numbers