Whois is a service that allows retrieving information about the owners of Internet addresses (domains) and IP addresses. The English phrase "Who is" ("Who is this") means that you can get contact information relating to domains and IP addresses.
To get the stored information, you need to know the corresponding whois server depending on the domain. Unfortunately, the queries themselves are becoming more complex because of the new extensions for different countries and the new generic top-level domains.
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