How many domains can I check in one bulk WHOIS lookup?

You can submit up to 10 non-empty lines, one hostname per line. Duplicate hostnames are removed after validation. Larger lists should be split into smaller batches within the service’s request limits.

Can I download registration and expiry dates as CSV?

Yes. After the lookup, download the report from this page. The CSV includes each domain, check time, source, returned fields and status, including errors for unavailable results.

Can the bulk WHOIS checker identify expired domains to buy?

It reports registration expiry dates when a registry publishes them. It does not verify purchase availability, auction status, ownership rights or the date a registrar might release a domain.

Is this tool free and do I need an account?

It is free to use without an account. Domain checks have request limits to protect public services. Results can be downloaded from this page.

Where is my input processed?

Checks run on our server and contact public DNS, registry, website or Ahrefs services as needed. Results can be cached; inputs are not added to your URL or account. Do not submit private addresses or secrets.

Bulk WHOIS lookup

Run a free bulk WHOIS lookup for up to 10 domains. Compare registrar, expiry dates and nameservers using RDAP, and download a timestamped CSV.

A report you can act on

Enter your domains to see measured values, sources and check times. Missing records, unsupported services and temporary failures are shown separately.

From input to output

How to use it

Look up public registration details for up to 10 domains at once. This free bulk WHOIS tool uses RDAP to compare registrar names, registration and expiry dates, nameservers and status, with a timestamped CSV export and no account required.

Paste up to 10 domains, one per line.
Each domain is checked independently with bounded concurrency.
Review the table or export CSV; failures and unsupported registries have their own rows.

Review several domain registrations in one report

Paste one public domain per line, with no more than 10 non-empty lines. Duplicate hostnames are removed. Each submitted hostname is resolved to its registered domain for the registry lookup, so subdomains do not receive separate ownership records.

Each result identifies the registry source and check time. Use the report to compare published renewal dates and registrar details across a small domain portfolio. The CSV retains each domain’s fields and status for your own records.

Keep incomplete lookup results visible

Domains are checked independently with a bounded batch time. Unsupported registries and service failures remain visible instead of disappearing from the comparison. Retry an unavailable domain separately if the batch could not finish its lookup.

A missing field or failed response is not proof that a domain is unregistered. Results contain public registry metadata, not private owner contacts, and successful readings can be reused for one hour. Confirm renewal actions with the relevant registrar.

Measurement and usage limits

Uses HTTPS RDAP, not legacy port-43 WHOIS. Results include public registration metadata, not owner contacts. Registry rate limits or missing coverage can leave rows unavailable. No availability-to-register claim is made.

Frequently asked questions

How many domains can I check in one bulk WHOIS lookup?: You can submit up to 10 non-empty lines, one hostname per line. Duplicate hostnames are removed after validation. Larger lists should be split into smaller batches within the service’s request limits.
Can I download registration and expiry dates as CSV?: Yes. After the lookup, download the report from this page. The CSV includes each domain, check time, source, returned fields and status, including errors for unavailable results.
Can the bulk WHOIS checker identify expired domains to buy?: It reports registration expiry dates when a registry publishes them. It does not verify purchase availability, auction status, ownership rights or the date a registrar might release a domain.
Is this tool free and do I need an account?: It is free to use without an account. Domain checks have request limits to protect public services. Results can be downloaded from this page.
Where is my input processed?: Checks run on our server and contact public DNS, registry, website or Ahrefs services as needed. Results can be cached; inputs are not added to your URL or account. Do not submit private addresses or secrets.