The registrar is the company a domain is registered through, and it is public. The registry that runs each extension publishes which registrar sponsors every name in it, so finding out where a domain is held takes one lookup and no login.
That matters most on the day you cannot remember. A domain bought years ago, set to renew automatically and never touched since, is easy to lose track of — and the registrar's login is the only place renewal, nameservers and transfers can be changed.
The lookup
Run the domain through the WHOIS Lookup. The Registration result names the registrar, and the transcript underneath lists its IANA ID and abuse contact where the registry provides them.
Personal contact details are redacted on most domains. The registrar is not, because it is a company and not a person, and the registry has to say who is responsible for a name.
From a terminal, the same answer:
whois example.com | grep -i registrar
Registrar, registry, host and DNS provider
Four different roles, often confused, and the confusion is why people log into the wrong account. One company can hold several of them for the same domain, which is exactly what makes them hard to tell apart.
| Role | What it does | Where to find it |
|---|---|---|
| Registry | Runs the whole extension, such as .com or .uk. You never deal with it directly. | Fixed by the extension |
| Registrar | Sells and renews the registration. Controls nameservers, the transfer lock and ownership. | WHOIS Lookup, Registration |
| DNS provider | Answers queries for the domain's records. | WHOIS Lookup, Nameservers |
| Web host | Runs the server the site is on. | The A record's address |
Then there is the registrant: you, the person or organisation the name is registered to. The registrar acts on the registrant's instructions.
The practical consequences:
- To renew a domain or stop it expiring, you need the registrar.
- To change nameservers, you need the registrar.
- To edit DNS records, you need the DNS provider — the company whose nameservers are listed, which may or may not be the registrar.
- To fix the website itself, you need the host.
Editing records at the registrar when the nameservers point somewhere else is one of the most common wasted afternoons in DNS. The DNS Checker shows which nameservers are actually answering.
When the registrar's name means nothing to you
The lookup returns a company you have never heard of and have certainly never paid. That is normal, and it has three usual explanations.
You bought through a reseller. Many hosting companies, website builders and agencies do not hold registrar accreditation themselves. They register names through a wholesale registrar, and that wholesaler is what the registry records. Your account, your invoice and your login are with the reseller.
The registrar trades under a different name. The legal entity accredited with ICANN is often not the brand on the website. Searching the registrar name shown, or its IANA ID, usually turns up the brand within the first few results.
Someone else registered it for you. A developer, an agency or a former employee registered the name in their own account. The domain works, you pay someone for it, and it is not actually under your control. This is worth discovering before the relationship ends, not after.
Finding the account
Knowing the registrar is half of it. The account is the other half.
- Search your email for the domain name. Registrars are required to send renewal and expiry notices. Search every inbox you have ever used for business, including old ones, for the domain itself and for words like "renewal" and "expiration".
- Search for the registrar's name and any brand it trades under.
- Check card and bank statements around the anniversary of the creation date, which the lookup also shows. An annual charge on roughly that date is your registrar or your reseller.
- Look at the nameservers. If they belong to a hosting company or website builder, that company is very likely where you bought the domain, whatever the registrar field says.
- Use the registrar's account recovery with each email address you might have used.
If none of that works, contact the registrar's support directly. They will not hand a domain to someone who simply asks, and they should not. Expect to prove identity against the registrant details on file: the name, organisation and email address the domain was registered with.
Is it registered at all
A related question with a different answer. If the lookup reports that the registry holds no record, the name is not registered with anyone, and there is no registrar to find.
That usually means it is available, with the caveats that apply to any apparently free name: it may be reserved, priced as premium, or sitting in a grace period after expiring. A domain you believed you owned that now shows no record has lapsed — what happens when a domain expires covers how long recovery remains possible.
Extensions that return nothing
Some registries publish no public RDAP service, including .co, .me, .us, .eu and several European country extensions. For those the lookup reports that no data is available instead of guessing.
The registry's own website nearly always has a lookup form, and that is the authoritative source in those cases. Country registries vary a good deal in what they publish; some name the registrar and nothing else, a few name nobody at all.
Once you know
Three things worth doing while the account is open in front of you.
Check who the registrant is. If the name on file is a former employee, a developer or an agency, change it to you or your organisation. Whoever is listed as registrant is, for practical purposes, the owner.
Check the contact email works. Expiry warnings and transfer confirmations go to it. A dead address means the first you hear of a problem is the site going offline.
Turn on the transfer lock and two-factor authentication. The lookup shows whether the lock is set. How to stop your domain being stolen covers the rest.
Then write down where the domain is, in the same place as the rest of the business's credentials. The registrar is public and can always be looked up again with the WHOIS Lookup. The account email and the person who holds it are not.