| A | B |
|---|
| 20 | FTP - File Transfer Protocol (Data) |
| 21 | FTP - File Transfer Protocol (Control) |
| 22 | SSH - Secure SHell |
| 23 | TELNET |
| 25 | SMTP - Simple Mail Transfer Protocol |
| 53 | DNS - Domain Name Service |
| 66, 68 | DHCP - Dynamic Host Configuration Protocol |
| 80 | HTTP - HyperText Transfer Protocol |
| 110 | POP3 - Post Office Protocol 3 |
| 143 | IMAP - Internet Message Access Protocol |
| 443 | HTTPS - HyperText Transfer Protocol Secure |
| 3389 | RDP - Remote Desktop Protocol |
