Port number

PORT NO.	Commonly used for	Remarks
20	FTP	File Transfer Protocol
21	SFTP	Secured Filter Transfer Protocal
22	SSH	Secure Shell
23	TELNET
25	SMTP
53	DNS	Domina Name System service
80	HTTP	WWW
110	POP3	EMAIL
119	NNTP
123	NTP
143	IMAP	EMAIL
161	SNMP
194	IRC
443	HTTPS	WWW

* 65535 is the maximum port number