Whois lookups are often useful when looking into gathering information about a domain name.
Checking whois information for a domain name is easy, using the whatsmydns.net whois lookup tool you can look up whois data for any domain name.
A whois lookup is a type of request which retrieves information about the owner of a domain name.
There is a lot of information returned from a whois request a domain name. This information typically includes the date that the domain name was registered, when it was last updated as well as when it is due to expire. Additionally, information about the owner and the registrar are also returned.
Any domain can have a whois lookup performed on it.
Some examples: google.com, wikipedia.org, apple.com, youtube.com, amazon.com