The following table is a list of Common Ports that are used in most major Operating Systems and their associated common uses.

PortProtocolCommon Usage
20TCPFTP
21TCPFTP
22TCPSSH
23TCPTelnet
25TCPSMTP
26TCPSMTP (Alternate)
53TCP & UDPDNS
67UDPDHCP
68UDPDHCP
80TCPHTTP
110TCPPOP3
123TCPNTP
143TCPIMAP
443TCPHTTPS (HTTP over SSL)
465TCPSMTP (over SSL)
993TCPIMAPS
995TCPPOP3S
1220TCPQuickTime Steaming
3389TCPRDP



Application Specific Ports

The following table lists any application specific ports that are commonly used.

Where multiple ports are available, a secure port should be used over a standard (unencrypted port).

PortProtocolCommon Usage
1433TCPMS SQL Server
2077TCPWHM WebDAV
2078TCPWHM WebDAV (Secure)
2082TCPcPanel
2083TCPcPanel (Secure)
2086TCPWHM
2087TCPWHM (Secure)
2095TCPWeb Mail
2096TCPWeb Mail (Secure)
3306TCPMySQL
5666TCPMemset Monitoring Client (Nagios / NRPE)
12121TCPWebmin