WHOIS is a public lookup that tells you the registration details behind a domain name. Type a domain into a WHOIS tool and you can see who registered it, which company they registered it through, when it was created, and when it expires. The name comes from the plain question it answers: who is responsible for this address.
Think of it as the public register at the land office. You may not get the owner’s phone number, but you can confirm a property exists, when it was claimed, and roughly who is behind it. For a domain name, that record sits behind the website and is searchable by anyone.
One big change is privacy. Since the GDPR, most registrars hide personal contact details, so you usually see the registrar and the key dates rather than a person’s name and address. The registration and expiry dates are still public and useful, especially for spotting a domain that is about to lapse.
WHOIS is most useful at two moments. Before buying a domain, the expiry date hints at how soon a name you want might free up, and the registrar tells you who to approach. After a takeover, it confirms the domain really sits under the account you think it does, not a former agency’s login that vanishes the day they stop responding. A name server lookup in the same record also shows where the domain currently points, which is handy when a website is loading from the wrong server.
At TopDevs we check WHOIS when we take over a client’s domain, so we know exactly who controls it and that it will not quietly expire on someone else’s account.
