A Whois domain lookup allows you to trace the ownership and tenure of a domain name. Similar to how all houses are registered with a governing authority, all domain name registries maintain a record of information about every domain name purchased through them, along with who owns it, and the date till which it has been purchased. 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. This tool can return WHOIS registration results for a Domain name. Depending on the registrar, you can see various information like who is it registered to, when it was registered and when it expires, where the DNS is hosted, and more.