With w3who, you can find sites from one owner. Why would someone need this information? Maybe just out of curiosity OR to research on the competition. W3who.net maintains a database of adsense/ google-analytics publisher ids to idenftify website networks. Furthermore, you can lookup miscellaneous information on a domain - ip address, server location, websites hosted on the same ip and similarly targeted sites by keywords.
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Tools: whats my ip, host by name, host by ip, reverse ip
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