Domain WHOIS Lookup – Who Owns This Domain? (Free)
Free WHOIS/RDAP lookup: find out who owns any domain instantly, plus the registrar, registration date, expiry date, and name servers.
What a domain WHOIS lookup is
A WHOIS lookup examines the published registration details of a domain name: which registrar administers it, when it was registered and when it expires, which name servers it uses, whether it is signed with DNSSEC. This tool fetches that information not over the old WHOIS protocol but over **RDAP**, its successor, which returns structured JSON.
What can be obtained is limited. Since the GDPR came into force in 2018, **the registrant details of domains registered by individuals are almost always withheld (REDACTED)**; a corporate registration may still show an organisation name. Certain country-code domains such as .jp and .uk fall outside rdap.org’s routing and may not be retrievable at all — a JP domain must be checked at the JPRS WHOIS. Results are cached for up to twenty-four hours, so a very recent change may not yet appear.
How to run a WHOIS lookup
- Enter the domain name Give the registered name, as in example.com. Leave off https:// and any path — the domain name alone.
- Run the search RDAP is queried and whatever comes back is laid out under its headings.
- Check the registration and expiry dates A domain nearing expiry will lapse if the renewal is forgotten, and can then be taken by somebody else. This is where you see how much grace is left.
- Look at the name servers and DNSSEC You learn which DNS service runs the domain and whether it is signed — a thread to pull on when transferring it or narrowing down a fault.
- Judge what came back empty Where a field reads “not available”, use the remarks to tell whether it is simply not published or whether the top-level domain has no RDAP support.
Tips for getting more out of it
- Check expiry dates: Monitor your own domains and competitors' to catch renewals before they lapse. An expired domain can be snapped up by a third party.
- Identify the registrar: Find out which registrar manages a domain — useful before a transfer or when managing multiple domains.
- Verify name servers: Confirm DNS configuration or check propagation after a name server change.
- Even with GDPR redaction, corporate domains often still expose the registrar and organization name.
Where a WHOIS lookup helps
Keeping watch on your own domain’s expiry
Letting a domain lapse stops the website and the email in the same stroke. Checking now and then is how a missed renewal gets noticed.
Confirming the registrar before a transfer
Transfer procedures differ from registrar to registrar. Knowing which one holds the domain before you start makes the arrangements quicker.
Gauging whether a domain you want is free
Registration data coming back means it is in use; nothing coming back suggests it may be unregistered. The expiry date hints at when it might be let go.
Looking into a suspicious domain
Domains registered only days ago are not rarely used for phishing. Whether the registration date is strikingly recent is one thing to weigh.
When you want to examine the domain further
To check the form of the name alone, use the domain name validator; for certificate expiry, the SSL certificate checker; for internationalised names, Punycode conversion.
Terms used with WHOIS
- WHOIS
- Both the arrangement for querying the registration details of a domain name or IP address, and those details themselves. It began as an old protocol exchanging plain text.
- RDAP
- Short for Registration Data Access Protocol. Built as the successor to WHOIS, it returns structured data in JSON. Because the shape of a response is settled, machines handle it easily.
- Registrar
- The company that accepts registrations of domain names. Registration, renewal and transfer are all done through a registrar.
- Registrant
- The party holding the domain. Since the GDPR, withholding the details of an individual registrant for the sake of privacy has become the rule.
- Name server
- The DNS server answerable for resolving names under the domain. Change it and where the website and the email point changes with it.
- DNSSEC
- An extension that attaches digital signatures to DNS answers so that tampering in transit can be detected. Whether a domain is signed appears in the WHOIS data.
- ccTLD
- A top-level domain assigned to a country or territory, such as .jp or .uk. Since each is run under its own policy, support for RDAP varies from one to the next.
Frequently Asked Questions
Side Note — The History of Domain Names and the Birth of WHOIS
The first .com domain, symbolics.com, was registered on March 15, 1985 — before the commercial internet existed. Network Solutions (NSI) had a monopoly on registrations, which were initially free. In 1995 NSI began charging $100/year, establishing that domain names had real monetary value. Today over 1,500 TLDs exist and tens of thousands of domains are registered every day.
WHOIS began as a simple directory for identifying who managed a given host. As the internet grew, it became essential for tracking spam, intellectual property violations, and domain disputes. The GDPR's arrival in 2018 fundamentally changed the picture: registrant contact data became protected personal information, and most registrars began redacting it. RDAP was designed to meet these modern demands — it runs over HTTPS, returns structured JSON, and supports authentication and access control.