Simple Alexa Rank checker, allow to check of urls group.
Alexa ranks sites based on tracking communication of users of its Alexa Toolbar for the treatment of Internet Explorer and from integrated sidebars in Firefox and Chrome.
Finally low ranks cannot be accurate not even-handed because of the shortage of text but also because of statistic laws related to the lengthy track distribution. The same laws present ranking of the customary sites approvingly precise.
There is some controversy over how representative Alexa's user base is of typical Internet behavior, especially for less trafficked sites.
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Bulk alexa rank tool source.