Port Numbers
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In TCP/IP networks (the Internet) a port is the way a client program specifies a specific server program on a computer in a network. Some ports have numbers that are preassigned to them by the IANA, and these are known as well-known ports. Port numbers range from 0 to 65536, but only ports numbers 0 to 1024 are reserved for privileged services and designated as well-known ports. Here is a selection of some of the more important port numbers:

Port Number    Description  
     
20   FTP -- Data     
21   FTP -- Control     
22   SSH Remote Login Protocol     
23   Telnet     
25   Simple Mail Transfer Protocol (SMTP)     
29   MSG ICP     
37   Time     
42   Host Name Server (Nameserv)     
43   WhoIs     
49   Login Host Protocol (Login)     
53   Domain Name System (DNS)     
69   Trivial File Transfer Protocol (TFTP)     
70   Gopher Services     
79   Finger     
80   HTTP     
103   X.400 Standard     
108   SNA Gateway Access Server     
110   POP3     
115   Simple File Transfer Protocol (SFTP)     
118   SQL Services     
119   Newsgroup (NNTP)     
143   Interim Mail Access Protocol (IMAP)     
150   NetBIOS Session Service     
156   SQL Server     
161   SNMP        
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     
 
 

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