By default port number in computer networking.

To configure firewall in a network, network administrator should know by default which service are using which port. But network admin can change the port of the system if required. Some common port in network engineering are given bellow. 


ftp --- 21 --- File Transfer Protocol

ssh --- 22 --- SSH Remote Login Protocol

telnet --- 23 ---Telnet

smtp --- 25 --- Simple Mail Transfer Protocol

tftp --- 69 ---T rivial 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) 

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