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I have two links from hosted tumblr blogs which are not on tumblr.com. So, website1 has a tumblr blog: tumblr.website1.com And another site website2.com also uses the a record/custom domains option from tumblr but not on a subdomain, which is decribed below: http://www.tumblr.com/docs/en/custom_domains Does this mean that all links from such sites count as coming from the same IP in google's eyes? Or is there value in getting links from multiple sites because the a-record doesn't affect SEO in a negative way? Many thanks, Mike.