Common Ports
Port		Service name				Transport protocol
 20, 21	 	File Transfer Protocol 			(FTP)	 TCP
 22	 	Secure Shell (SSH)	 		TCP and UDP
 23	 	Telnet	 				TCP
 25	 	Simple Mail Transfer Protocol 		(SMTP)	 TCP
 50, 51	 	IPSec	
 53	 	Domain Name System (DNS)		TCP and UDP
 67, 68	 	Dynamic Host Configuration Protocol 	(DHCP)	 UDP
 69	 	Trivial File Transfer Protocol 		(TFTP)	 UDP
 80	 	HyperText Transfer Protocol 		(HTTP)	 TCP
 110	 	Post Office Protocol (POP3)	 	TCP
 119	 	Network News Transport Protocol 	(NNTP)	TCP
 123	 	Network Time Protocol 			(NTP)	UDP
 135-139 	NetBIOS	 				TCP and UDP
 143	 	Internet Message Access Protocol (IMAP4)TCP and UDP
 161, 162	Simple Network Management Protocol(SNMP)TCP and UDP
 389	 	Lightweight Directory Access Protocol	TCP and UDP
 443	 	HTTP with Secure Sockets Layer (SSL)	TCP and UDP
 3389	 	Remote Desktop Protocol	 		TCP and UDP

Ports 0 to 1023 are Well-Known Ports.
Ports 1024 to 49151 are Registered Ports (often registered by a software developer to designate a particular port for their application)
Ports 49152 to 65535 are Public Ports.