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DI-206 ISDN Remote Router
Appendix C – IP Protocol and
Port Numbers
Common Internet service protocols and IP port numbers.
IP Protocol Numbers
IP Port Numbers
FTP
Telnet
SMTP
DNS
Finger
WWWHTTP
POP3
SNMP
162
Numbers
Protocol #
Protocol Name
1
ICMP
2
IGMP
6
TCP
8
EGP
9
IGP
17
UDP
46
RSVP
88
EIGRP
115
L2TP
Service
TCP
21
23
25
53
79
80
110
137
138
139
Internet Control Message [RFC792]
Internet Group Management [RFC1112]
Transmission Control [RFC793]
Exterior Gateway Protocol [RFC888,DLM1]
any private interior gateway [IANA]
(used by Cisco for their IGRP)
User Datagram [RFC768,JBP]
Reservation Protocol [Bob Braden]
EIGRP [CISCO,GXS]
Layer Two Tunneling Protocol [Aboba]
UD
P
File Transfer
Simple Mail Transfer
53
Domain Name Server
World Wide Web HTTP
Post Office Protocol – Version 3
137
NetBios Name Service
138
NetBios Datagram Service
139
NetBios Session Service
161
Appendix C – IP Protocol and Port
Description
Notes
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