Domain Availability Checker
Network & DomainsCheck whether a domain looks free using public RDAP registries.
Calculated Result
Enter a target and run
Formula: RDAP 404 ≈ available · 200 ≈ registered
About this calculator
Type a name like example.com. Calnora asks the public RDAP bootstrap. A 404 usually means the registry has no registration object. That is not a binding quote — premium and reserved names can still fail at checkout.
How It Works & Formula
FormulaRDAP registry query → 404 ≈ available
normalize host → GET rdap.org/domain/{name} → map HTTP 404 to available, 200 to registered with status/dates.
Frequently Asked Questions
Is RDAP the same as Whois?
RDAP is the modern JSON replacement for port-43 Whois. Many registries answer RDAP; a few still lag.
Can I rely on “available” to buy?
Use it as a first filter. Always re-check on a registrar cart page.