The ICSI Netalyzr
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Debug your Internet.

The Netalyzr tests your Internet connection for signs of trouble. Understand your connectivity through a detailed report of any performance and security issues.
What's up with my network?
Some services seem broken? Things are very slow? Is there something wrong?
Run the Netalyzr.
We test your Internet connection for signs of trouble.
Understand your connectivity.
A detailed report shows performance & security issues.

Learn more, see an example report, check out the NetaMap, look at the FAQ, or try the command­line client. Netalyzr works on any computer with a Java runtime and on Android devices.

Please enable JavaScript in order to run Netalyzr.

Please note: Netalyzr is not only a debugging tool — it is also the foundation of a comprehensive measurement study compiling a survey of the health of the Internet's edge. By running Netalyzr and helping us spread the word you are contributing crucially to the quality of our study. Thanks for your help!