TCP port number
ports numbers are between 1 to 65536. We are mostly using upto 1024
20 and 21 for FTP
22 for SSH remote login protocol
23 for telnet
25 for SMTP (simple mail transfer protocol)
37 for time
53 for DNS (domain name server)
70 for GOPHER
80 for HTTP
110 for POP3
118 for SQL services
190 for Gate access control protocol (GACP)
194 for internet relay chat (IRC)
389 for lightweight directory access protocol (LDAP)
443 for HTTPS
1080 for socks
