Well-known UDP port assignments

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

Table 1. Well-known UDP 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	users	active users	active users
13	daytime	daytime	daytime
15	netstat	Netstat	Netstat
19	chargen	ttytst source	character generator
37	time	timeserver	timeserver
39	rlp	resource	Resource Location Protocol
42	nameserver	name	host name server
43	nicname	who is	who is
53	domain	nameserver	domain name server
69	tftp	TFTP	Trivial File Transfer Protocol
75			any private dial out service
77	rje	netrjs	any private RJE service
79	finger	finger	finger
111	sunrpc	sunrpc	Sun remote procedure call
123	ntp	NTP	Network Time Protocol
135	llbd	NCS LLBD	NCS local location broker daemon
161	snmp	SNMP	SNMP server
162	snmptrap	SNMPTRAP	SNMP trap
531	rvd-control		rvd control port
2001	rauth2		Andrew File System service, for the Venus process
2002	rfilebulk		Andrew File System service, for the Venus process
2003	rfilesrv		Andrew File System service, for the Venus process
2018	console		Andrew File System service
2115	ropcons		Andrew File System service, for the Venus process
2131	rupdsrv		assigned in pairs; bulk must be srv +1
2132	rupdbulk		assigned in pairs; bulk must be srv +1
2133	rupdsrv1		assigned in pairs; bulk must be srv +1
2134	rupdbulk1		assigned in pairs; bulk must be srv +1
12000	entextxid		IBM® Enterprise Extender SNA XID Exchange
12001	entextnetwk		IBM Enterprise Extender SNA COS Network Priority
12002	entexthigh		IBM Enterprise Extender SNA COS High Priority
12003	entextmed		IBM Enterprise Extender SNA COS Medium Priority
12004	entextlow		IBM Enterprise Extender SNA COS Low Priority