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http://moz.com/learn/seo/redirection can help. You're specifically looking for the "Redirecting Canonical Hostnames" section. Briefly, google considers the following as different pages, even if they are the same. example.com www.example.com Other fun things that can also happen are having all of these pages have the same content, but you can use the following URLs to get to that one piece of content: example.com example.com/ example.com/index.html www.example.com www.example.com/ www.example.com/index.html Hope that helps!