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Now if the owner and whois information was the same for the sites with the same IP then I might suspect something fishy - maybe. But again, if all of the owner's sites on the same IP were related, then maybe it would make sense for the owner to link all his sites to a certain site. For example, what about subdomains? Many sites use subdomains and each one links back to the main site. Subdomains are considered as different sites, but they usually share the same IP and owner. I think this is a totally legitimate way of linking to one site from multiple sites that share the same IP and owner.