Is my port open?
Set up a port forward for a game, console or server and not sure it works? This connects from the internet back to your connection on the port you pick and tells you whether anything answered.
What this can and can't test
It tests TCP. Many games also use UDP, which no website can test, because UDP doesn't answer unless the game itself is running and talking. For UDP, run the connection check to see your NAT type instead.
Privacy
The check only ever connects to the address you're visiting from, once per click. That address isn't stored or logged.
Forwarding ports rarely lowers lag on its own. If games feel slow, the one-click Boost finds where the lag starts.
How it works
When you click check, our server tries to open a TCP connection to the address you're visiting from, on the port you picked. If something on your network answers, the port forward works. It only ever connects to your own address, once per click, and nothing is stored.
Reading your result
- Open
- Your router forwards the port and a program answered. The forward works.
- Closed or no answer
- Either the router doesn't forward it, the program isn't running, a firewall blocks it, or your provider puts you behind a shared address (CGNAT), where forwarding can't work.
Questions
Does port forwarding reduce lag?
Rarely. It fixes connection problems such as Strict NAT and failed matchmaking, not lag. For lag, find where it starts with the Lag Check.
Why can't I check UDP ports?
UDP doesn't answer unless the game itself is running and talking, so no website can test it. The connection check shows your NAT type, which tells you whether UDP connections get through.