Whois Checker tools are online services that allow users to look up information about a domain name, including its owner, registrar, and contact information. These tools query the WHOIS database, which is a publicly accessible database that contains information about registered domain names.

A typical Whois Checker tool will ask the user to input the domain name they are interested in and will then search the WHOIS database for any available information about the domain. The tool may display information such as the domain's creation and expiration dates, the registrar responsible for managing the domain, and contact details for the domain owner.

Some Whois Checker tools also provide additional information such as the domain's DNS servers, IP address, and hosting provider. This information can be useful for website owners and web developers who need to troubleshoot issues with their website or verify the authenticity of a domain.

Overall, Whois Checker tools can be a valuable resource for anyone looking to learn more about a domain name and its ownership details. However, it's important to keep in mind that some domain owners may choose to keep their contact information private, which may limit the amount of information that can be obtained through a Whois lookup.