What is ‘Whois’?
When you register a domain name, the Internet Corporation for Assigned Names and Numbers (ICANN) requires your domain name registrar to submit your personal contact information to the WHOIS database. Once your listing appears in this online domain WHOIS directory, it is publicly available to anyone who chooses to check domain names using the WHOIS search tool.
When using this tool, enter a domain name, URL, or IP address.