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.
| 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 |
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 |
| 109 |
POP2 |
| 110 |
POP3 |
| 115 |
Simple File Transfer Protocol (SFTP) |
| 118 |
SQL Services |
| 119 |
Newsgroup (NNTP) |
| 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 |
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TCP Port Numbers