Port 20

Protocol: FTP

Service: FTP

Description: File Transfer Data

Port 21

Protocol: FTP

Service: FTP

Description: File transfer control information

Port 22

Protocol: SSH

Service: Secure Shell

Description: Remote control to a networked computer.

Port 23

Protocol: Telnet

Service: Telnet

Description: Telnet, an application used by Unix computers to control a computer remotely.

Port 25

Protocol: SMTP

Service: E-mail

Description: Simple Mail Transfer Protocol; used by a client to send e-mail

Port 80

Protocol: HTTP

Service: Web server

Description: World Wide Web protocol

Port 109

Protocol: POP2

Service: E-mail

Description: Post Office Protocol, version 2; used by a client to receive e-mail

Port 110

Protocol: POP3

Service: E-mail

Description: Post Office Protocol, version 3; used by a client to receive e-mail

Port 119

Protocol: NNTP

Service: News server

Description: News servers that use the Network News Transfer Protocol (NNTP), the protocol used for newgroups

Port 143

Protocol: IMAP

Service: E-mail

Description: Internet Message Access Protocol, a newer protocol used by clients to receive e-mail

Port 443

Protocol: HTTPS

Service: Web server

Description: HTTP with added security that includes authentication and encryption

Port 53

Protocol: DNS

Service: DNS

Description: Domain Name System

Port 69

Protocol: TFTP

Service: TFTP

Description: Trivial File Transfer Protocol.