Well Known Ports

The full range of available ports is 0 - 65536 and can be used dynamically by any application however in general ports 0 - 1024 are pre-defined and 'well known' which is to say 22 is always ssh, 80 is http and so on.

Port Number	Description
1	TCP Port Service Multiplexer (TCPMUX)
5	Remote Job Entry (RJE)
7	ECHO
18	Message Send Protocol (MSP)
20	FTP -- Data
21	FTP -- Control
22	SSH Remote Login Protocol
23	Telnet
25	Simple Mail Transfer Protocol (SMTP)
29	MSG ICP
37 39	Time RIP
42	Host Name Server (Nameserv)
43	WhoIs
49	Login Host Protocol (Login)
53 67 68	Domain Name System (DNS) bootps bootpc
69	Trivial File Transfer Protocol (TFTP)
70	Gopher Services
79	Finger
80 88 101 102	HTTP Kerberos Hostname iso-tsap
103 107	X.400 Standard rtelnet
108	SNA Gateway Access Server
109	POP2
110 111 113	POP3 sunrpc auth
115 117	Simple File Transfer Protocol (SFTP) uucp-path
118	SQL Services
119 123	Newsgroup (NNTP) NTP - Network Time Protocol
137	NetBIOS Name Service
139	NetBIOS Datagram Service
143	Interim Mail Access Protocol (IMAP)
150	NetBIOS Session Service
156	SQL Server
161	SNMP
179	Border Gateway Protocol (BGP)
190	Gateway Access Control Protocol (GACP)
194	Internet Relay Chat (IRC)
197	Directory Location Service (DLS)
389	Lightweight Directory Access Protocol (LDAP)
396	Novell Netware over IP
443	HTTPS
444	Simple Network Paging Protocol (SNPP)
445	Microsoft-DS
458	Apple QuickTime
546	DHCP Client
547	DHCP Server
563	SNEWS
569	MSN
1080	Socks