Query WHOIS/RDAP information for domains, IP addresses, CIDR prefixes and ASNs. Results are normalized to RDAP-style (RFC 9083) JSON. Public instance of the open-source KincaidYang/whois server, which can also be self-hosted.
Check domain name availability via RDAP. Single lookups, bulk checks (up to 50), and smart name suggestions with registration links. No API key needed.
The official WhoisXML API MCP server providing 32 first-party tools for WHOIS, DNS, IP geolocation, threat intelligence, typosquatting, email verification, and native bulk lookups.