Some common Port Number

If you want to Network Firewall Configure for that you should be necessary know that which Port used for which service. For system Administrator below some Port Number.

ftp–21–File Transfer Protocol
ssh–22–SSH Remote Login Protocol
telnet–23–Telnet
smtp–25–Simple Mail Transfer Protocol
tftp–69–Trivial File Transfer Protocol
gopher–70–Gopher
http–80–World Wide Web HTTP
pop2–109–Post Office Protocol-V2

pop3–110–Post Office Protocol-V3
nntp–119–Network News Transfer Protocol
imap–143–Internet Message Access Protocol
irc–194–Internet Relay Chat Protocol
imap3–220–Interactive Mail Access Protocol V3
https–443–http protocol over TLS/SSL
printer–515–spooler
imap4-ssl–585–IMAP4+SSL (use 993 instead)
ftps–990–ftp protocol, control, over TLS/SSL
telnets–992–telnet protocol over TLS/SSL
imaps–993–imap4 protocol over TLS/SSL
ircs–994–irc protocol over TLS/SSL
pop3s–995–pop3 protocol over TLS/SSL (was spop3)