Common Ports-
Program / Name Port

discard 9
netstat 15
chargen 19
ftp data 20
ftp connection 21
telnetd 23
smtp 25
rlp 39
bootp 67
fingerk 79
http 80 / 8080
military http 80 / 8080 /5580
link 87
pop3 110
identd 113
nntp 119
newsk 144
execk 512
login 513
pkill 515
ktalk 517
ntalk 518
netwall 533
rmontior 560
montior 561
kerberos 750