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Is there a way to find out the entire list of domain names that a person or company owns?

For example, I am doing research on Company X and want to know what domain names are owned by Company X. Is this possible to do? Thanks.

Public Comments

1. No. You can check individual domains, so you can certainly tell whether Company A owns a certain domain, but there are no laws that govern who can own a domain, and the domain registrar does not care who pays for it. By this reasoning, Company A may own no domains at all, but the IT Director may own hundreds, all of which were paid for by Company A. So even if you could search by owner, it would be non-informative at best. At one point, InterNIC issued unique ID's to all registrants, technical, and admin contacts, which was supposed to help in tracking who owned what, but the pool grew so large that it became impossible to maintain. Furthermore, if a user didn't keep track of his ID, he would be issued a new one each time he registered (I think I had four at one point).