| 0 |
TCP |
Downstream |
Reserved port, not accessible to the Internet. |
| 21 |
TCP |
Downstream |
Used for router management; should not be accessible to the Internet. |
| 22 |
TCP |
Downstream |
Used for router management; should not be accessible to the Internet. |
| 23 |
TCP |
Downstream |
Used for router management; should not be accessible to the Internet. |
| 25 |
TCP |
Downstream/Upstream |
Used for email server communication; use port 587 for email submission. |
| 67 |
UDP |
Downstream |
Used for IP address assignment; managed by DNA, not accessible to the Internet. |
| 80 |
TCP |
Downstream |
Used for router management; should not be accessible to the Internet. |
| 135-139 |
TCP/UDP |
Downstream/Upstream |
Used for file system access; not accessible to the Internet. |
| 161 |
UDP |
Downstream/Upstream |
Used for router management; should not be accessible to the Internet. |
| 443 |
TCP |
Downstream |
Used for router management; should not be accessible to the Internet. |
| 445 |
TCP |
Downstream/Upstream |
Used for file system access; not accessible to the Internet. |
| 520 |
UDP |
Downstream/Upstream |
Used by an outdated routing protocol; not accessible to the Internet. |
| 547 |
UDP |
Downstream |
Used for IP address assignment; managed by DNA, not accessible to the Internet. |
| 1080 |
TCP |
Downstream |
Used by the SOCKS protocol; often used to bypass security software. |
| 1900 |
UDP |
Downstream/Upstream |
Used for router management; should not be accessible to the Internet. |
| 8291 |
TCP |
Downstream |
Used for router management; should not be accessible to the Internet. |
| 8728-8729 |
TCP |
Downstream |
Used for router management; should not be accessible to the Internet. |