In the last days this tool had of lot of attention , but seems something it's not clear . The test it's not a benchmark tool , and is not a race about who make 100% , it's a reference tool to check if you are blocking any of the host , in this case are used the most important hosts by category and popularity as reference
Oh, and if you get a bad points when you are sure that your blocking system used works , then probably you are on a browser that manage error connection in different ways so the tool will not detect it .
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