- 20 - FTP (Data Transfer)
- 21 - FTP (Control)
- 22 - SSH (Secure Shell)
- 23 - Telnet
- 25 - SMTP (Simple Mail Transfer Protocol)
- 53 - DNS (Domain Name System)
- 80 - HTTP (HyperText Transfer Protocol)
- 110 - POP3 (Post Office Protocol 3)
- 123 - NTP (Network Time Protocol)
- 143 - IMAP (Internet Message Access Protocol)
- 161 - SNMP (Simple Network Management Protocol)
- 443 - HTTPS (HTTP Secure)
- 445 - SMB
- 993 - IMAP (SSL/TLS)
- 995 - POP3 (SSL/TLS)
- 3306 - MySQL
- 3389 - RDP (Remote Desktop Protocol)
- 5900 - VNC (Virtual Network Computing)