WHOIS is the public directory that holds registration information about a domain — when it was registered and when it expires, which registrar manages it, its name servers, and (unless protected) the registrant’s contact details. You query a domain name and get back its record. Modern privacy rules now redact much of the personal data, and a successor protocol, RDAP, is steadily replacing the old WHOIS system.
Every registered domain leaves a paper trail, and WHOIS is where that trail has traditionally been read. For decades it was the go-to way to ask “who registered this, and when does it expire?” The system still works, but what it reveals — and the technology behind it — has changed significantly. Here is the current picture.
What is WHOIS, exactly?
WHOIS is both a protocol and the public record it serves. When a domain is registered, certain details are recorded and made queryable. Anyone can look up a domain and receive back its registration data — historically including the registrant’s name and contact information. The name is literally the question it answers: “who is” responsible for this domain?
The data ultimately ties back to the registry for the relevant TLD and the registrar that handled the registration. WHOIS is simply the window through which that information has been exposed to the public.
A query-and-response system and public directory for domain registration data — registration and expiry dates, registrar, name servers, and (subject to privacy rules) registrant contact details.
What information does WHOIS show?
A typical WHOIS record contains a mix of administrative and technical fields:
| Field | What it tells you |
|---|---|
| Registration date | When the domain was first registered. |
| Expiry date | When the current registration term ends. |
| Registrar | The company managing the registration. |
| Name servers | The DNS servers the domain currently uses. |
| Status codes | Locks and states (e.g. transfer-prohibited). |
| Registrant contact | Name and contact details — often redacted or privacy-protected. |
The non-personal fields — dates, registrar, name servers, status — are usually still visible and are genuinely useful for checking whether a domain is taken, when it expires, or where it is hosted.
What is WHOIS privacy protection?
Because WHOIS was public by default, registrants’ personal details were once openly harvestable — an open door to spam and unwanted contact. Two developments changed that:
- WHOIS privacy services. For a fee (now often free) a registrar replaces your name, address, email and phone with the privacy service’s details, so the public record no longer exposes you.
- Data-protection law. Modern privacy regulation pushed the industry to redact personal contact data from public records by default for many registrations, regardless of any add-on service.
Privacy doesn’t change your ownership
Turning on WHOIS privacy only changes what the public sees. You are still the registrant, you still control the domain, and your registrar still holds your real details. It simply keeps scrapers and spammers from reading them.
When you register a domain, it is worth checking whether your registrar includes privacy — see what is a domain registrar for what to look for.
What is RDAP, and why is it replacing WHOIS?
WHOIS is an old protocol with real limitations: it returns unstructured free text, has no standard for access control, and handles non-Latin scripts poorly. Its successor, RDAP (Registration Data Access Protocol), was designed to fix all three:
- Structured data — machine-readable responses instead of free-form text.
- Standardised access — a consistent way to control who can see what, supporting graduated access to redacted fields.
- Internationalisation — proper handling of non-Latin registrant data.
ICANN’s official lookup tool is now RDAP-based, and the industry is transitioning to it. In everyday speech people still say “WHOIS lookup,” but increasingly the data behind that lookup comes from RDAP.
How do you do a WHOIS lookup?
It is straightforward:
- Open a WHOIS/RDAP lookup tool — ICANN’s official lookup is a reliable, neutral choice.
- Enter the domain name you want to check.
- Read the record: registration and expiry dates, registrar, name servers, status codes, and any contact data that isn’t redacted.
This is the same lookup that confirms whether a name is available before you register it — a natural first step in how to register a domain.
★ Key takeaways
- WHOIS is the public record of a domain’s registration — dates, registrar, name servers and (if shown) contact details.
- WHOIS privacy hides your personal details from the public without affecting your ownership.
- Data-protection law has made redaction of personal contact data common by default.
- RDAP is the modern, structured successor and now powers ICANN’s official lookup.
Frequently asked questions
What is WHOIS in simple terms?
WHOIS is a public lookup system that tells you registration details about a domain — when it was registered, when it expires, which registrar manages it, and, depending on privacy settings, who registered it. You query a domain and get back its record.
Can I see who owns any domain with WHOIS?
Sometimes. WHOIS shows the registrant’s details only if they are not protected. Since modern privacy rules and data-protection law took effect, many records redact personal contact information by default or replace it with privacy-service or registrar contact details, so the real owner is often hidden.
What is WHOIS privacy protection?
WHOIS privacy (or domain privacy) replaces your personal name, address, email and phone in the public record with a privacy service’s details, so spammers and scrapers cannot harvest them. Many registrars now include it free where the TLD allows it. Your registration is unaffected — only what is shown publicly changes.
Is WHOIS being replaced?
Yes. WHOIS is gradually being replaced by RDAP (the Registration Data Access Protocol), a modern successor that returns structured data, supports secure access and standardised redaction, and handles internationalised data better. ICANN’s own lookup tool is now RDAP-based, though “WHOIS” remains the common name for the lookup.
How do I do a WHOIS lookup?
Use a WHOIS/RDAP lookup tool — for example ICANN’s official lookup — and enter the domain. You will see registration and expiry dates, the registrar, name servers and any unredacted contact data. Registrars and many third-party sites offer the same lookup.