Domain registrar lookup: where is my domain registered, and where do I edit its DNS?
In short: Enter a domain or a list and get each one's registrar and expiry from the registry, the company that runs its DNS (where records are edited) and its email provider. Limit: Registries that publish no RDAP, including .io, .co and .de, return no registrar, so those rows show the DNS host and email provider only.
A domain registrar lookup tells you which company a domain is registered with. This one also answers the question that usually follows: where to edit its DNS. The registrar and expiry come from the registry's RDAP record, the DNS host from the domain's nameservers, and the email provider from its MX records, for one domain or a list.
By SimpleVerifier Team · Last updated
How do I find a domain's registrar and DNS host?
- Enter a domain, or paste a list, one per line. Emails, URLs and subdomains are reduced to the registered name, so
mail.acme.co.ukis looked up asacme.co.uk. - Press Find registrar and DNS host. Each domain's registry is asked for its RDAP record, and its NS and MX records are read from public DNS.
- Read where it's registered, where to edit its DNS records (with that company's own guide where we have checked it) and who runs its email.
- Go on to the email setup check for the domain, or download everything as CSV.
Example
- You enter
- The domain
yournewbusiness.example, registered at one registrar with its nameservers pointed at Cloudflare and MX records on Google Workspace. - You get
- Registered with the registrar named in the registry's RDAP record, with its expiry date. The tool says to edit DNS records at Cloudflare, not at the registrar, links to Cloudflare's guide to DNS records, and says email runs on Google Workspace, with a link to the email setup check.
- Limits
- Up to 100 domains a run without an account and 500 when signed in with Google, 25 per request. One RDAP lookup and NS, MX and TXT queries per domain; .io, .co, .de and other registries without RDAP return no registrar.
How do I find out where my domain is registered?
Ask the registry. Every generic top-level domain's registry runs RDAP, the structured successor to WHOIS, and its record names the registrar the domain is held with (ICANN). This tool finds the right registry from IANA's RDAP bootstrap file and reads the registrar, registration date and expiry from it, the same lookup as the WHOIS lookup.
Some country-code registries, including those for .io, .co and .de, publish no RDAP, so their registrar shows as unknown here. Their own registry website or a registrar's WHOIS page is the place to look for those.
Where do I edit my domain's DNS records?
At whoever runs the domain's nameservers, which is often not the company you bought it from. If you registered at Namecheap but pointed the nameservers at Cloudflare, records added at Namecheap do nothing: Cloudflare answers for the domain now. The tool reads the NS records, names the company behind them (Cloudflare, GoDaddy, Namecheap, Route 53, Vercel, Squarespace and about 40 others) and links to that company's own guide to adding records where we have checked it.
That is where the email records go too. MX, SPF, DKIM and DMARC are DNS records, so once you know where to edit them, the domain email setup checker gives the exact values for Google Workspace, Microsoft 365 or Zoho.
What's the difference between a registrar, a DNS host and a web host?
The registrar holds the registration: you renew there and can transfer away from it. The DNS host runs the nameservers that answer for the domain, so records are edited there. The web host serves the website the A or CNAME record points to, and the mail provider receives the email the MX records point to. One company can do all four, but they are often split, which is why this tool shows them side by side. To see the web host, use the website host checker.
Why not just run a WHOIS lookup?
| This tool | WHOIS / RDAP only | |
|---|---|---|
| Registrar and expiry | Yes | Yes |
| Where DNS records are edited | Named from the NS records | Raw nameserver hostnames |
| Email provider | From MX | Not included |
| Many domains at once | Up to 100, or 500 signed in | One at a time |
Who uses this tool, and for what?
- Founders
- Bought a domain for a new business and need to add Google Workspace or Microsoft 365 records? Find where its DNS is edited first, then run the email setup check.
- Agencies
- Taking over a client's domains: one CSV with each registrar, expiry date and DNS host tells you which logins to ask for.
- Cold emailers
- Keep track of where each sending domain is registered and whose DNS it uses, so SPF, DKIM and DMARC changes go to the right account.
- IT and ops
- Audit a company's domains for renewals spread across registrars and DNS hosts nobody remembers setting up.
What can’t this tool tell you?
- Registries that publish no RDAP, including .io, .co and .de, return no registrar, so those rows show the DNS host and email provider only.
- The DNS host is named from its nameserver hostnames; nameservers we don't recognise are listed as they are.
- A guide link appears only for DNS hosts whose official help page we have checked; for others, look in that company's dashboard.
- Owner and contact details are not shown, and the registrar's account login can't be found from public data.
Common questions
- How do I find out who my domain registrar is?
- Enter the domain above. The registrar is read from the registry's RDAP record, the official registration data, along with the registration and expiry dates. For TLDs without RDAP, such as .io, .co and .de, it shows as unknown.
- Why don't my DNS changes at my registrar work?
- Usually because the nameservers point somewhere else, such as Cloudflare or a web host. Records only take effect at whoever runs the nameservers. The lookup names that company so you can make the change there.
- Can I look up the registrar of many domains at once?
- Yes. Paste up to 100 domains a run without an account, or 500 after a free Google sign-in. Each row has the registrar, expiry, DNS host and email provider, and the list downloads as CSV.
- Is the registrar the same as the web host?
- Not necessarily. The registrar holds the registration, the DNS host answers for the domain, and the web host serves the site. They are often three different companies.
- Does it show who owns the domain?
- No. Owner details are usually redacted in the public record, and this tool doesn't show contact data. The WHOIS lookup shows what the registry publishes, contacts included, when you ask for them.
Sources
A tidy list can still be full of dead addresses.
Extracting, deduplicating and syntax checks all work on the text of an address. None of them can tell whether the mailbox exists. Only the server that hosts it can answer that, through an SMTP check, and that is what the paid product does.
- Upload the cleaned file as it is: CSVs up to 100,000 rows
- A real SMTP mailbox check on every row, with catch-all detection
- Small list? Starter at $9/mo covers 2,500 emails a month, cancel anytime
One plan, cancel anytime, no contract. Sign in with Google and your first 100 email checks are free, no card. The free tools stay free either way.