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A Whois checker is a tool that allows users to look up the ownership and registration information for a domain name or IP address. This information includes the name and contact details of the registrant, as well as the name servers and expiration date of the domain.
Whois checkers are often used for a variety of purposes, such as verifying the ownership of a domain, checking the availability of a domain for registration, and identifying the contact information for a website or server. They are commonly used by web developers, SEO professionals, and domain investors to gather information about websites and domain names.
Some Whois checkers also provide additional information, such as the technical details of a website or server, the history of a domain name, and any changes to its ownership or registration information. Some Whois checkers are available as online tools that can be accessed through a web browser, while others are available as software programs that can be downloaded and installed on a computer.