IANA service port assignments: https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml?search=
SpeedGuide port listing and community comments on ports: https://www.speedguide.net/port.php?port=
Favourite Ports:
21 - FTP
22 - SSH
23 - Telnet
25 - SMTP
465 - SMTP SSL
587 - SMTP TLS
53 - DNS
80 - HTTP
8080 - HTTP Proxy (Webcache)
443 - HTTP SSL
8443 - HTTP SSL Alternate
110 - POP
995 - POP SSL
111 - RPC Bind
123 - NTP
135 - MS RPC
137 - NetBIOS Name Service
139 - NetBIOS Session Service
143 - IMAP
993 - IMAP SSL
389 - LDAP
445 - MS DS (SMB)
1433 - MS SQL
1723 - PPTP
2082-2083 - CPanel
2086-2087 - CPanel WHM
3306 - MySQL
3389 - RDP
5060 - SIP
5432 - PostgreSQL
5900 - VNC
6001 - X Window Server