WhoisJSON

Connects Claude to the WhoisJSON API for domain intelligence lookups. You get four tools: whois_lookup pulls registration data like registrar info and nameservers, dns_lookup fetches all DNS records including A, MX, TXT, and DMARC, ssl_check validates certificates, and domain_availability tells you if a domain is up for grabs. Requires a WhoisJSON API key from their dashboard. Useful when you need to audit domain configurations, investigate ownership chains, or check SSL expiry dates without leaving your conversation. Runs via npx with stdio transport, so setup is just dropping your API key into Claude's config.