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.

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Please note: after nearly a decade of providing this service we have decided to shut down Netalyzr in the first week of March 2019. It pains us greatly to do so, but each team member has at this point moved on to other responsibilities. Our Android app users will receive a final update during this time. Thanks to everyone who has used the service over the years — you all helped make the project a tremendous success.