Cisco Systems OL-6426-02 manual Common Port Assignments, Port Keyword Description

A P P E N D I X D

Common Port Assignments

Table D-1lists currently assigned Transmission Control Protocol (TCP) port numbers. To the extent possible, the User Datagram Protocol (UDP) uses the same numbers.

		Table D-1		Currently Assigned TCP and UDP Port Numbers
		Port	Keyword		Description
0			—		Reserved
		1–4	—		Unassigned
5			RJE		Remote job entry
7			ECHO		Echo
9			DISCARD		Discard
11			USERS		Active users
13			DAYTIME		Daytime
15			NETSTAT		Netstat
17			QUOTE		Quote of the day
19			CHARGEN		Character generator
20			FTP-DATA		File Transfer Protocol (data)
21			FTP		File Transfer Protocol
23			TELNET		Terminal connection
25			SMTP		Simple Mail Transport Protocol
37			TIME		Time
39			RLP		Resource Location Protocol
42			NAMESERVER		Hostname server
43			NICNAME		Who is
49			LOGIN		Login Host Protocol
53			DOMAIN		Domain name server
67			BOOTPS		Bootstrap Protocol Server
68			BOOTPC		Bootstrap Protocol Client
69			TFTP		Trivial File Transfer Protocol
75			–		Any private dial-out service
				Cisco 1800 Series Integrated Services Routers (Fixed) Software Configuration Guide
	OL-6426-02					D-1