WHOIS / RDAP Lookup Tool
This tool first attempts RDAP (no key required). If RDAP is restricted or you selected a paid provider, you may supply an API key. For production, put server-side proxy to avoid CORS issues or protect API keys.
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Notes
If you get a CORS error, the browser blocked the direct request. Use a server-side proxy or a paid API that supports CORS, or host server code to perform lookup.