Ports

TCP Ports

Server Application

Explanation

21

File Transfer Protocol (FTP)

For transferring information from one computer to another in a network.

23

Telecommunication Network (TELNET)

Provides remote logins to computer through internet.

25

Simple

Mail Transfer Protocol (SMTP)

Standard for e-mail transactions over the internet.

37

TIME

Provides site independent, machine readable date and time.

80

Hypertext Transfer Protocol (HTTP)

Provides data transfer over the internet.

110

Post Office Protocol Version 3 (POP3)

Retrieves e-mail from a remote server over TCP/IP.

443

Hypertext Transfer Protocol over Secure Socket Layer (HTTPS)

This is an extra layer of authentication between TCP & HTTP; a kind of secure HTTP connection basically.