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, or see an example report, or look at the FAQ.

Netalyzr's main site is at http://netalyzr.icsi.berkeley.edu. Please update your links.