Whois Mcp Server

cyanheads/whois-mcp-server

A lightweight RDAP and DNS-over-HTTPS client that lets Claude look up domain registrations, check name availability, fetch DNS records, and resolve IPs and ASNs without any API keys. Built on IANA bootstrap for automatic registry selection across all TLDs and RIRs. The six tools cover individual lookups (domain WHOIS, DNS records, IP netblocks, ASN details) plus a unified dossier call that runs registration and DNS queries in parallel. Useful for security triage, domain research, or network reconnaissance workflows where you need factual signals like registrar, nameservers, age, and privacy redaction status. Runs on stdio or streamable HTTP, surfaces partial failures as data rather than errors, and handles RDAP-less TLDs explicitly instead of breaking silently.

GitHub stars

2

tools

6

transport

STDIO, HTTP

env vars

11

last updated

Nov 11, 2026

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