– measuring the Internet.

Network Architectures and Services

This test is based on a JAVA applet and runs in your browser. In order to allow us to communicate with our test servers, we had to digitally sign this applet. You can check the signature by clicking "show more details". If you have trouble running the applet, please check if JAVA is installed (check). You can download JAVA here: download

Please install Java first: download

By clicking "start NAT Analyzer", you agree that we store the following data (only for research use)
  • Your public IP address
  • Your external mappings (local IP Address:port -> public IP address:port) for some test connections
  • Availablity of UPnP devices

  • You can see an example result and the data we store here: Example Result