Well Known Port Numbers

80 – Hypertext Transfer Protocol (HTTP)

21 – File Transfer Protocol (FTP)

23 – Telnet protocol – unencryptedtext communications

25 – Simple Main Transfer Protocol(SMTP)

109 – Post Office Protocol v2 (POP2)

110 – Post Office Protocol v3 (POP3)

115 – Simple File Transfer Protocol(SFTP)

143 – Internet Message Access Protocol (IMAP)

443 – Hypertext Transfer Protocol over SSL/TLS (HTTPS)

992 – TELNET protocol over TLS/SSL

993 – Internet Message Access Protocol over SSL (IMAPS)

995 – Post Office Protocol 3 over TLS/SSL (POP3S)

1433 – MSSQL Server

1801 – Microsoft Message Queuing

Well Known Port Numbers