Name checker

Is that great name already taken?

Before you commit to a name, see whether the .com site and the @handles are still free — in one pass, in a few seconds.

Your recent checks appear here — nothing saved yet.

No signupNo paywall20 checks per searchHistory stays in your browser

Everything in one place

One search runs domain and social checks together. No account, no paywall.

  • 12 domain endings: .com, .com.br, .net, .org, .io, .dev, .app, .co, .me, .ai, .tech, .online
  • 8 networks: GitHub, Bluesky, Instagram, TikTok, X, Facebook, LinkedIn, YouTube
  • Copy or open each result from the card
  • Last 10 searches saved in your browser (local only)

How domain checks work

Each ending is asked of the registry that actually runs it — Verisign for .com, Registro.br for .com.br, and so on. A registration on file means taken; no record means free. When a registry does not answer, or has no public RDAP server at all, as is the case for .co, the card says there is no reliable answer instead of showing a green check. A domain can be registered without DNS yet, so confirm on a registrar before you buy.

How social checks work

GitHub and Bluesky are checked automatically through their public APIs, so those answers are real. Instagram, TikTok, X and most other networks block datacenter bots — we do not fake a green check. Those cards say Check and open the profile URL with your name so you can verify in one click.

What we do not promise

  • No trademark or legal clearance — only public availability signals
  • No domain pricing or premium-domain detection
  • No Instagram/TikTok auto-verification — manual View is the honest path
  • Rate limits on public APIs may occasionally return “no reliable answer”
WhatsName — check if a name is already in use · CastorStack