Common Well-Known Ports

ftp-data          20
ftp               21
ssh               22
telnet            23

smtp              25   AKA mail
domain            53   AKA DNS, name resolution
tftp              69
www               80
https            443

pop              109
sunrpc           111
ntp              123

afs-fileserver  7000
afs-prserver    7002
afs-vlserver    7003
afs-kaserver    7004




     Other Less-Common Well-Known Ports

netbios-ns       137
irc              194
Lotus Notes     1352