Home/ Free tools/ Domain availability checker

Free Domain Name Availability Checker

See if a domain name is available in seconds. Type just a name to scan the popular extensions, or a full domain to check one. It runs a live RDAP lookup (the modern WHOIS) right in your browser — no login, no limits, nothing stored.

Domain or name to check

Type just a name to check popular extensions, or a full domain (name.tld) to check one.

Results

Results will appear here — enter a name above and hit Check.

Checked live via RDAP (rdap.org), with a DNS fallback for extensions that publish no RDAP (like .io, .co, .me). Availability shown here is a strong signal, not a reservation — only registering the domain secures it. A registered-but-undelegated name can occasionally read as free, so confirm at a registrar before you rely on it.

Got your domain? Give it a contact page with live chat — free. Set up in your console →

◈ GOT THE NAME? NOW GET THE LINK

Registering a domain can take a day to point somewhere. While the DNS settles — or if you don't want to build a full site yet — a free Knocket contact page gives your brand a live link today: chat, WhatsApp, email, and booking behind one URL you can share immediately. Grab your free page →

Why check a domain before you commit

The name you pick shows up in your email, your social handles, your logo, and every ad you ever run. Checking availability first saves you from falling in love with a name that's already taken — or from picking a brand where the matching .com is gone and you'd be fighting an established site for the top search result.

Catch clashes early — before you print cards, buy ads, or register a handle you can't match.
Compare extensions side by side: the .com may be gone but .io, .co, or .app could be wide open.
A quick RDAP lookup is the real registry answer — not a guess or a cached list.
Scan a shortlist of names in a couple of minutes instead of one-by-one at a registrar.

How to check domain availability

Type a name — just the brand (e.g. acme) to scan popular extensions, or a full domain (acme.io) for one.
Hit Check — each extension is looked up live against the registry.
Read the results — green means it looks unregistered, red means it's taken.
Register the winner at any registrar before someone else does.

◈ HOW IT WORKS

This tool asks the authoritative registry directly using RDAP (Registration Data Access Protocol) — the modern, structured replacement for WHOIS. A registration record (HTTP 200) means taken; a registry "not found" means available. For extensions that publish no RDAP service (like .io, .co, .me), it falls back to a live DNS lookup — a name that doesn't resolve is almost certainly free. Everything runs from your browser, so there's nothing to log in to and nothing stored.

Who uses a domain checker

What this checker can and can't tell you

RDAP gives you the registry's own answer, which is about as authoritative as it gets. But a couple of honest caveats:

For extensions with no public RDAP (like .io, .co, .me) it uses a DNS lookup instead — reliable, but slightly less authoritative than RDAP.
A domain that's technically registered may still be parked, expiring, or for sale — "taken" doesn't always mean "in use".
Availability can change minute to minute. This is a strong signal, not a hold — only registering the domain reserves it.
A free domain isn't the same as a free trademark. Check that the name isn't already a brand in your space.

Once the name is yours, you still need somewhere to point it. A free Knocket page is the fastest way to put a real, contactable presence behind a fresh domain — no build required.

Frequently asked questions

Is this domain checker free?

Yes — completely free, no login, no limits. Each lookup runs live from your browser against the registry via RDAP. Nothing you type is stored or sent to us.

How accurate is it?

Very. RDAP is the registry's own registration record, so it's the authoritative answer for extensions that support it. For the few that don't publish RDAP (like .io), the tool falls back to a live DNS lookup — a name that doesn't resolve at all is almost certainly unregistered. Either way, treat the result as a strong signal and confirm at a registrar before you commit.

What's the difference between WHOIS and RDAP?

RDAP is the modern replacement for WHOIS: same purpose (who holds a domain), but structured JSON with proper access control and internationalization. Registries are standardizing on RDAP, so this tool uses it directly and falls back to DNS where RDAP isn't offered.

Does "available" mean I own it?

No. Available means no one has registered it yet. To actually secure a domain you have to register it at a registrar — until you do, anyone else can take it.

Which extensions do you check?

When you type just a name, it scans a popular set — .com, .io, .co, .net, .org, .ai, .app, and .dev. Type a full domain like name.xyz to check any single extension.

Where do I register the domain?

At any accredited registrar — Namecheap, Cloudflare, Porkbun, GoDaddy, and many others. Prices vary by extension, so it's worth comparing. This tool doesn't sell domains; it just tells you what's free.