| # | Protocol | Protocol‘s Full Name |
|
143 − 252 |
Unassigned |
Unassigned |
|
253 |
Use for experimentation and testing |
|
|
254 |
Use for experimentation and testing |
|
|
255 |
Reserved |
Further information can be found by researching RFC 5237.
Protocol Number
IP is responsible for more than the address that it is most commonly associated with and there are a number of associated protocols that make up the Network Layer. While there are not 256 of them, the field that identifies them is a numeric value between 0 and 256.
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) [RFC2460], this field is called the “Next Header” field.
Protocol Numbers
| # | Protocol | Protocol‘s Full Name |
|
0 |
HOPOPT |
IPv6 Hop-by-Hop Option |
|
1 |
ICMP |
Internet Control Message Protocol |
|
2 |
IGMP |
Internet Group Management |
|
3 |
GGP |
Gateway-to-Gateway |
|
4 |
IPv4 |
IPv4 encapsulation Protocol |
|
5 |
ST |
Stream |
|
6 |
TCP |
Transmission Control Protocol |
|
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 |