Look the name up in the registry for each ending you want. A domain availability checker does this in one go: it asks the registries through RDAP, the service that replaced WHOIS, and uses DNS for endings like .io and .co whose registries do not offer RDAP. "Registered" means someone owns it; "available" means the registry has no record of it, which is worth confirming at a registrar before you buy.
Free domain name availability checker. Type a name and see at once whether it is registered on .com, .io, .ai, .app, .dev, .co and more, straight from the official registries.
Open Domain Name Availability Checker → Free toolFree business name generator. Enter a keyword and instantly get brandable company and product name ideas using prefixes, suffixes and blends. Copy any idea.
Open Business and Brand Name Generator →Every domain ending is run by a registry. If the registry has a record for your name, it is registered, even if no website is live on it. If there is no record, it can normally be registered, although some names are reserved or sold at premium prices by the registry itself.
Startups often settle on .com, .io, .ai, .app or .dev. Checking all of them together shows quickly whether a name is usable at all, so you do not fall in love with a name that is taken everywhere.
No. Many registered domains have no site. Only the registry knows whether it is registered.
The name has no DNS records, which usually means it is unregistered, but the registry could not confirm it directly.
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