Well-known ports
An IP address and a port number together make up a transport layer
address (TSAP). A transport layer connection is identified by the IP, port
number pairs for the two hosts at either end of the connection.
- 7 echo
- 18 message send protocol
- 20 ftp data transfer
- 21 ftp control
- 22 SSH remote login protocol
- 23 telnet
- 25 simple mail transfer protocol (SMTP)
- 53 domain name server
- 69 trivial file transfer
- 79 finger
- 80 HTTP
- 110 post office protocol 3 (POP3)
- 115 simple file transfer protocol
- 119 network news transfer protocol
- 179 border gateway protocol
- 190 gateway access control protocol
- 194 Internet relay chat protocol (IRC)
- 389 lightweight directory access protocol (LDAP)