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In TCP/IP and UDP networks, a port is an endpoint to a logical connection and 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 (specified in RFC 1700). 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. This list of well-known port numbers specifies the port used by the server process as its contact port.
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Port Number Description
TCP Port Service Multiplexer (TCPMUX)
Remote Job Entry (RJE)
ECHO
Message Send Protocol (MSP)
FTP -- Data
FTP -- Control
SSH Remote Login Protocol
Telnet
Simple Mail Transfer Protocol (SMTP)
MSG ICP
Time
Host Name Server (Nameserv)
WhoIs
Login Host Protocol (Login)
Domain Name System (DNS)
Trivial File Transfer Protocol (TFTP)
Gopher Services
Finger

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444
445
458
546
547
563
569
1080
161
179
190
194
197
389
396
443
115
118
119
137
139
143
150
156
80
103
108
109
110
For further information, see RFC 1700.
HTTP
X.400
Standard
SNA Gateway Access Server
POP2
POP3
Simple File Transfer Protocol (SFTP)
SQL Services
Newsgroup ( NNTP )
NetBIOS Name Service
NetBIOS Datagram Service
Interim Mail Access Protocol (IMAP)
NetBIOS Session Service
SQL Server
SNMP
Border Gateway Protocol (BGP)
Gateway Access Control Protocol (GACP)
Internet Relay Chat (IRC)
Directory Location Service (DLS)
Lightweight Directory Access Protocol (LDAP)
Novell Netware over IP
HTTPS
Simple Network Paging Protocol (SNPP)
Microsoft-DS
Apple QuickTime
DHCP Client
DHCP Server
SNEWS
MSN
Socks
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