A list of default ports which are widely used:
| FTP (File Transfer Protocol) | 21 |
| SMTP (Simple Mail Transfer Protocol) | 25 |
| HTTP (Hypertext Transfer Protocol) | 80 (IIS)/8080 (Apache) |
| HTTPS | 443 |
| IMAP/IMAPS (Internet Message Access Protocol) | 143/993 |
| MSSQL (Microsoft SQL Server) | 1433/1434 |
| MYSQL | 3306 |
| VNC (Virtual Network Computing) | 5800/5900 |
| RDP (Remote Desktop Protocol) | 3389 |
Need to know all click here