Network Tools
Port Checker
Enter a host and a port to see whether it's open, closed, or filtered by a firewall.
How it works
This tool tries a raw TCP connection to the host and port you give it, from the RouteLearn server. Then it reports what happened: the port accepted the connection (open), the host refused it (closed), or nothing came back at all within a few seconds (filtered — usually a firewall).
FAQ
- What does "filtered" mean, versus "closed"?
- Closed means the host answered and said no — nothing is listening on that port. Filtered means no answer came back at all. That almost always means a firewall is silently dropping the connection somewhere along the way.
- Why does this check from a server, not from my own computer?
- A port can look different depending on where you check from. Many services (like a home router's admin page) are only open on your local network. They'd show as filtered or closed from the outside internet, even though they're perfectly reachable from your own PC. This tool answers one question: "can the internet reach this port?" That's different from "can I reach it from here?"
- Can I check any port on any address?
- You can check any public host and any port from 1 to 65535. Private and internal addresses (like 192.168.x.x, 10.x.x.x, or localhost) are blocked. This tool runs on a shared server, so it shouldn't be used to probe internal networks.