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RDAP Lookup

queries the official RDAP registry for your input via the rdap.org bootstrap, directly from your browser.

RDAP (Registration Data Access Protocol) is the structured, JSON-over-HTTPS successor to WHOIS. Classic WHOIS runs on TCP port 43, which a browser can't open. RDAP is plain HTTPS and ICANN's gTLD profile mandates Access-Control-Allow-Origin: *, so this works fully client-side.

Works best for gTLDs (.com, .org, .dev, .io …) and IP allocations (ARIN/RIPE/APNIC). Some ccTLD registries don't expose CORS-enabled RDAP. Those fail honestly rather than guess.