Well known Port Numbers

 21     FTP -- Control
22     SSH Remote Login Protocol
23     Telnet
25     Simple Mail Transfer Protocol (SMTP)
53     Domain Name System (DNS)
67      DHCP Clint
68      DHCP SERVER
80       HTTP
110     POP3
143     Interim Mail Access Protocol (IMAP)
389     Lightweight Directory Access Protocol (LDAP)
443     HTTPS
546     DHCP Client
547     DHCP Server