Domain Availability Checker

Enter a name and see, per TLD, whether it can be registered. The verdict is honest by design: AVAILABLE appears only when the registry’s RDAP answered 404 and the TLD metadata confirms RDAP operates — a WHOIS-only “not found” stays “likely available”, never dressed up as a certainty.

Optional: pick TLDs to check alongside the name (up to 10).

What this checks

For each TLD you pick (or the domain’s own), the checker queries the registry’s RDAP service via rdap.org and reads the answer through an embedded TLD metadata snapshot. A name is AVAILABLE only on a definitive RDAP 404 from a registry that operates RDAP; a registration record means REGISTERED (with registrar and expiry when published); closed or restricted TLDs (like .gov) are marked RESTRICTED without a lookup.

Why the states are cautious

  • A WHOIS-only “not found” is shown as UNKNOWN (“likely available”) — WHOIS false negatives are a known registry reality, so we never turn one into AVAILABLE.
  • TLDs whose availability mechanism is unknown are answered with UNKNOWN — an honest “we don’t know” instead of a guess.
  • Premium pricing is a separate subsystem: results never claim a domain is premium or free-to-buy, and “premium” is always unknown in this version.
  • IDN domains are first-class: Unicode input is canonicalized to punycode, and the Unicode display form is kept alongside.

Privacy and limits

No account needed; anonymous checks are not stored. Lookups are cached briefly (60 seconds) to protect the registries, and registration facts for 6 hours. Up to 10 TLDs per request, a few lookups in flight, one overall time budget — the UI never hangs.

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