By default port number of some service.

To configure firewall in a network, network administrator should know by default which service use which port. Some common port for network administrator….


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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