Well-known port assignments

This topic lists the well-known port assignments for transport protocols TCP and UDP, and includes port number, keyword, and a description of the reserved port assignment. You can also find a list of these well-known port numbers in the hlq.ETC.SERVICES data set. The official assignment of port numbers is managed by the Internet Assigned Numbers Authority. The current list can be viewed at http://www.iana.org/assignments/port-numbers.

Table 1 lists the well-known port assignments for TCP.

Table 1. TCP well-known port assignments
Port number	Keyword	Assigned to	Services description
0		reserved
5	rje	remote job entry	remote job entry
7	echo	echo	echo
9	discard	discard	sink null
11	systat	active users	active users
13	daytime	daytime	daytime
15	netstat	netstat	who is up or netstat
19	chargen	ttytst source	character generator
21	ftp	FTP	File Transfer Protocol
23	telnet	telnet	telnet
25	smtp	mail	Simple Mail Transfer Protocol
37	time	timeserver	timeserver
39	rlp	resource	Resource Location Protocol
42	nameserver	name	host name server
43	nicname	who is	who is
53	domain	name server	domain name server
57	mtp	private terminal access	private terminal access
69	tftp	TFTP	Trivial File Transfer protocol
77	rje	netrjs	any private RJE service
79	finger	finger	finger
80	http	http	Web Server
87	link	ttylink	any private terminal link
95	supdup	supdup	SUPDUP protocol
101	hostname	hostname	nic hostname server, usually from SRI-NIC
109	pop	postoffice	Post Office Protocol
111	sunrpc	sunrpc	Sun remote procedure call
113	auth	authentication	authentication service
115	sftp	sftp	Simple File Transfer Protocol
117	uucp-path	UUCP path service	UUCP path service
119	untp	readnews untp	USENET News Transfer Protocol
123	ntp	NTP	Network Time Protocol
160–223		reserved
712	vexec	vice-exec	Andrew File System authenticated service
713	vlogin	vice-login	Andrew File System authenticated service
714	vshell	vice-shell	Andrew File System authenticated service
2001	datasetsrv		Andrew File System service
2106	venus.itc		Andrew File System service, for the Venus process