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DI-1162 Remote Access Router
Appendix D – IP Protocol and Port
Numbers
Common Internet service protocols and IP port numbers.
IP Protocol Numbers
Protocol #
Protocol Name
1
ICMP
2
IGMP
6
TCP
8
EGP
9
IGP
17
UDP
46
RSVP
88
EIGRP
115
L2TP
IP Port Numbers
Service
TCP
FTP
21
Telnet
23
SMTP
25
DNS
53
Finger
79
WWWHTTP
80
POP3
110
137
138
139
SNMP
SNMP Trap
Appendix D – IP Protocol and Port Numbers
Description
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]
UDP
Notes
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
162
145
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