Well-Known UDP Ports

Service	UDP Port Number	Description
echo	7	Echo
discard	9	Discard or null
systat	11	Users
daytime	13	Daytime
netstat	15	Network status
qotd	17	Quote of the Day
chargen	19	Character generator
time	37	Time server
name	42	Host Name server
domain	53	Domain name server (DNS)
nameserver	53	Domain name server (DNS)
bootps	67	Bootstrap protocol service/DHCP
bootpc	68	Bootstrap protocol client/DHCP
tftp	69	Trivial File Transfer Protocol
portmap	111
sunrpc	111	SUN RPC service
ntp	123	Network Time Protocol
nbname	137	NetBIOS name
nbdatagram	148	NetBIOS datagram
sgmp	153
snmp	161	Simple Network Management Protocol
snmp-trap	162	Simple Network Management Protocol trap