HP VCX Software manual List of the most important reserved ports, Name Port/protocol Description

Appendix C. Lists of Reserved Ports,

ICMP Types and Codes, and Internet

Protocols

The following lists discuss the most important ports and the server services that belong to them, and the different types of ICMP messages. Client programs usually use ports between 1024 and 65535.

There are also lists over Internet protocols, reserved IP addresses and a mapping between netmasks and IP address intervals.

List of the most important reserved ports

This is a list of important ports. See /etc/services and http://www.iana.org/.

Name	Port/protocol	Description
echo	7/tcp
echo	7/udp
discard	9/tcp	sink null
discard	9/udp	sink null
systat	11/tcp	users
daytime	13/tcp
daytime	13/udp
netstat	15/tcp
qotd	17/tcp	quote
chargen	19/tcp	ttytst source
chargen	19/udp	ttytst source
ftp-data	20/tcp	ftp data transfer
ftp	21/tcp	ftp command
ssh	22/tcp	Secure Shell
telnet	23/tcp
smtp	25/tcp	mail
time	37/tcp	timeserver
time	37/udp	timeserver
rlp	39/udp	resource location
nicname	43/tcp	who is
domain	53/tcp	domain name server
domain	53/udp	domain name server
sql*net	66/tcp	Oracle SQL*net
sql*net	66/udp	Oracle SQL*net
bootps	67/tcp	bootp server

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