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Open Site Explorer is Powered by SEOmoz's Linkscape Web Index.

Linkscape's Index:

9.2 Trillion Links
0.4 Trillion URLs
92 Million Root Domains

Crawled in the Past 45 Days:

416 Billion Links
41 Billion URLs
114 Million Root Domains
Last Index Update: April 4th, 2011 Next Index Update: April 2011
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