Port Checker
Check whether a TCP port on your public IP address can be reached from the internet — the quickest way to test port forwarding for a game server, camera, NAS or remote desktop.
IP Address
Port Number
Click on one of the ports below or type in your port manually
Updated October 8, 2026
What the result means
- Open — our server connected to the port: something on your network answers there, and port forwarding works.
- Closed or filtered — nothing answered within a few seconds. Either no program is listening, or the router, a firewall or your provider stops the connection.
The check uses TCP and runs from our server on the internet, exactly like a friend connecting to your game server would. Your own public IP is filled in automatically; you can check any public address, but not private ones such as 192.168.x.x.
How to test port forwarding
- Start the program that should answer — the game server, camera, Plex or remote desktop. With nothing running, every port shows as closed.
- In the router, forward the port to the local IP of that device. Give the device a fixed local address (DHCP reservation) first, otherwise the forwarding breaks when the address changes — see how to find the local IP.
- Allow the program in the device’s firewall (Windows Defender Firewall, for example).
- Check the port here. Do the test from outside — checking your own public IP from inside the home network can give misleading results on some routers.
Why the port stays closed
- CGNAT. If your router’s WAN address starts with 100.64–100.127 or is a private address, the provider shares one public IP among many customers and forwarding cannot work. Compare it with your public IP and ask the provider for a public address.
- Double NAT. Your router sits behind the provider’s modem-router. Forward the port on both devices, or put the provider’s device in bridge mode.
- The provider blocks the port. Many home plans block ports 25 and sometimes 80; use another external port, for example 8080.
- Wrong target. The forwarding points to an old local IP, or uses UDP when the program needs TCP. This tool checks TCP only.
Keep open ports to a minimum
Every open port is a door from the internet into your network. Open only what you use, close forwarding you no longer need, keep the device behind it updated, and never expose the router’s own admin page to the internet. For occasional remote access, a VPN into your home network is safer than open ports.
Port checker: frequently asked questions
Why are all ports closed?
That is normal for a home network: the router blocks incoming connections unless you forward a port and a program answers on it.
Can this tool check UDP ports?
No. UDP has no connection to test reliably from outside, so the tool checks TCP only.
Is it safe to have open ports?
Only for services you actually use and keep updated. Close forwarding you do not need.
Why can I not check 192.168.1.1?
It is a private address that exists only inside your home network. Check your public IP instead.
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