Domain Availability Checker: Bulk DNS + RDAP

Find out which domain names are taken and which look available. Give it up to 1,000 domains, or a list of names and TLDs (acme × com, io, ai…). Only registrable names are accepted, such as acme.com or acme.co.uk. Subdomains and bare suffixes are rejected. For each domain it reports:

• registered: the domain is delegated in DNS, or the registry's RDAP record shows it is registered;
• available: not in DNS, and the registry's RDAP service has no registration record (only when RDAP confirmation is on);
• likely_available: not in DNS, and not confirmed by RDAP. This is a strong hint, not a guarantee: names registered without nameservers also look like this;
• unknown: DNS did not answer (timeout or server failure). Not billed;
• invalid_tld, not_registrable or invalid_input: not a valid registrable domain. Not billed.

Try it free first

Run it with empty input. A free demo checks 4 domains, which isn't billed, so you can see the output format.

How it works

1. DNS delegation check for every domain (and once for each TLD, so a made-up TLD is never reported as available).
2. Optional RDAP confirmation, off by default. When it's on, up to 10 "looks available" names per run are checked with the registry, so that names registered but not in DNS (for example parked without nameservers, or on hold) aren't reported as available. It sends at most one request every 2 seconds to each registry. All RDAP lookups stop for the run if any registry refuses or rate-limits them. The Google Registry RDAP service (.dev, .app and others) is never queried, because its terms have no exception for checks before registration.

What it can't tell you

• Availability is not a guarantee. Only a registrar can confirm a name at checkout. Premium, reserved and blocked names, and names released during the run, can differ.
• No price or owner data. It doesn't show registration prices or WHOIS contact details.
• Some TLDs have no public RDAP service (for example many country-code TLDs such as .io and .co). For those, results are DNS-only and are reported as likely_available.

Fair use of registry services

Registries offer RDAP to help people look up registrations, including before registering a name. Their terms prohibit high-volume automated querying. This Actor therefore uses DNS for bulk checks and keeps RDAP to a small, paced, opt-in number of confirmations per run. Please use it to check names you're considering registering. It isn't for harvesting registration data.

Acceptable use

Don't use this Actor to find look-alike or typo domains of other people's brands for typosquatting, phishing or impersonation. It has no typo or permutation generator, and none will be added.

Output

One dataset item per domain, with domain, tld, status, method (dns or dns+rdap), rdap and checkedAt. A SUMMARY record holds the counts.

Pricing

• Pay per event: each domain that gets a status (registered, available or likely_available) is one domain-checked event.
• Not billed: unknown, invalid_tld, not_registrable, invalid_input, and the demo.
• The price is shown on the Pricing tab. You can cap the maximum charge per run in Apify's run options.

Support

Open an issue on this Actor's Issues tab.

About

• Independent: made by an independent developer. Unofficial; not affiliated with or endorsed by Apify or any domain registry.
• Built with AI: built and maintained with the help of AI tools, under the developer's direction.