Services

More common services can be located in /etc/services on most BSD, Linux and Unix systems.

Port numberServiceDependencies
20FTP (data)TCP
21FTP (command)TCP
22SFTPTCP
22SSHTCP
23TelnetTCP
25SMTP (insecure)TCP
67DHCP (server)UDP
68DHCP (client)UDP
69TFTPUDP
80HTTPTCP
110POP3 (insecure)TCP
135Windows RPCTCP/UDP
143IMAPTCP
389LDAPTCP/UDP
443HTTPSTCP
445SMBTCP
587SMTP (secure)TCP
636LDAPsTCP
993IMAP (secure)TCP
995POP3 (secure)TCP
1433SQL Server (default instance)TCP
1434SQL Server (dedicated admin connection)TCP
1434SQL Server (browser service)UDP
2376Docker engineTCP
3306MySQLTCP
5432PostgreSQLTCP/UDP