Standaard ports
Hieronder staat een lijst met standaard veelvoorkomende porten. Deze porten kan je vaak beter niet toewijzen aan andere applicaties/services en vrij houden.
| # | Portnummer: | Beschrijving: |
| 1. | 1 | TCP Port Service Multiplexer. |
| 2. | 7 | Echo port. |
| 3. | 9 | Wake-on-LAN. |
| 4. | 18 | Message Send Protocol. |
| 5. | 20 | FTP data transfer (File Transport Protocol). |
| 6. | 21 | FTP control command (File Transport Protocol). |
| 7. | 22 | SSH (Secure Shell), SFTP, SCP. |
| 8. | 23 | Telnet. |
| 9. | 25 | SMTP. |
| 10. | 53 |
DNS. |
| 11. | 67 |
DHCP. |
| 12. | 68 |
DHCP. |
| 13. | 80 |
HTTP (web). |
| 14. | 110 |
POP3. |
| 15. | 115 |
Simple File Transport Protocol. |
| 16. | 143 |
IMAP. |
| 17 | 220 |
IMAP. |
| 18. | 443 |
HTTPS (secure web). |
| 19. | 465 |
SMTP over TLS/SSL (SMTPS) |
| 20. | 520 |
Routing Information Protocol (RIP) |
| 21. | 521 |
Routing Information Protocol Next Generation (RIPng). |
| 22. | 546 |
DHCPv6 client. |
| 23. | 547 |
DHCPv7 server. |
| 24. | 587 |
Email message submission (SMTP). |
| 25. | 647 |
DHCP Failover protocol. |
| 26. | 666 |
Doom. |
| 27. | 992 |
Telnet over TLS/SSL. |
| 28. | 3306 |
SQL. |
| 29. | 25565 |
Minecraft default. |