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Appendix C
Protocol Numbers
The ofcial Assigned Internet Protocol Numbers list is maintained by the Internet Assigned Numbers Authority and
can be found at http://www.iana.org/assignments/protocol-numbers. The list as of April 18, 2008 is reproduced in the
following table (without references).
Num Keyword Protocol
0 HOPOPT IPv6 Hop-by-Hop Option
1 ICMP Internet Control Message
2 IGMP Internet Group Management
3 GGP Gateway-to-Gateway
4 IP IP in IP (encapsulation)
5 ST Stream
6 TCP Transmission Control
7 CBT CBT
8 EGP Exterior Gateway Protocol
9 IGP any private interior gateway
(used by Cisco for their
IGRP)
10 BBN-
RCC-
MON
BBN RCC Monitoring
11 NVP-II Network Voice Protocol
12 PUP PUP
13 ARGUS ARGUS
14 EMCON EMCON
15 XNET Cross Net Debugger
16 CHAOS Chaos
17 UDP User Datagram
18 MUX Multiplexing
19 DCN-
MEAS
DCN Measurement Subsys-
tems
20 HMP Host Monitoring
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
28 IRTP Internet Reliable Transaction
29 ISO-TP4 ISO Transport Protocol Class 4
Num Keyword Protocol
30 NETBLT Bulk Data Transfer Protocol
31 MFE-NSP MFE Network Services
Protocol
32 MERIT-
INP
MERIT Internodal Protocol
33 DCCP Datagram Congestion Control
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 Proto
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 Pro-
tocol
46 RSVP Reservation Protocol
47 GRE General Routing Encapsula-
tion
48 DSR Dynamic Source Routing
Protocol
49 BNA BNA
50 ESP Encap Security Payload
51 AH Authentication Header
52 I-NLSP Integrated Net Layer Security
TUBA
53 SWIPE IP with Encryption
54 NARP NBMA Address Resolution
Protocol