Here’s a list of some of the most common network ports and their uses:

Well-Known Ports (0-1023)

1. Port 20/21 (FTP – File Transfer Protocol)
   • Port 21: Control (commands)
   • Port 20: Data transfer
2. Port 22 (SSH – Secure Shell)
   • Used for secure remote login and command execution.
3. Port 23 (Telnet)
   • Unencrypted remote login. Rarely used due to security concerns.
4. Port 25 (SMTP – Simple Mail Transfer Protocol)
   • Used for sending emails.
5. Port 53 (DNS – Domain Name System)
   • Resolves domain names to IP addresses.
6. Port 67/68 (DHCP – Dynamic Host Configuration Protocol)
   • Port 67: Server
   • Port 68: Client
7. Port 80 (HTTP – Hypertext Transfer Protocol)
   • Used for web traffic over the internet.
8. Port 110 (POP3 – Post Office Protocol)
   • Retrieves emails from a mail server.
9. Port 143 (IMAP – Internet Message Access Protocol)
   • Used for retrieving and managing email messages.
10. Port 443 (HTTPS – Secure HTTP)
    • Secure web traffic using SSL/TLS.
11. Port 161/162 (SNMP – Simple Network Management Protocol)
    • Port 161: Queries
    • Port 162: Traps/Notifications

Registered Ports (1024-49151)

12. Port 3306 (MySQL)
    • Default port for MySQL database servers.
13. Port 3389 (RDP – Remote Desktop Protocol)
    • Used for remote desktop access in Windows.
14. Port 1433 (Microsoft SQL Server)
    • Default port for Microsoft SQL database servers.
15. Port 5900+ (VNC – Virtual Network Computing)
    • Default is 5900; other ports vary per display number.
16. Port 8080 (Alternative HTTP)
    • Often used for proxy and web servers.

Dynamic/Private Ports (49152–65535)

17. Ephemeral Ports
    • Temporary ports assigned for client-server communication. These vary dynamically.

Additional Notable Ports

18. Port 135 (Microsoft RPC)
    • Used for Remote Procedure Call services.
19. Port 445 (SMB – Server Message Block)
    • Used for file sharing and Windows network communication.
20. Port 123 (NTP – Network Time Protocol)
    • Synchronizes time between devices.