Domain Owner Information Query
Here's another tool that basically does what it says on the packaging: it goes out and finds the Whois information from whatever DNS server the site is registered to. This usually includes the Technical Contact, Administrative Contact, Billing Contact and the owner of the domain, as well as any telephone numbers or addresses that may go along.
Keep in mind that more and more domains are utilizing Privacy Services that obscure their actual contact information: therefore, you might not be able to get what you're looking for.
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