WHOIS/RDAP LookupMCP Server

This project is a self-hosted registration-data lookup service that speaks both plain REST and MCP. It normalizes WHOIS and RDAP responses across public TLDs, IP address ranges, and autonomous system numbers into consistent JSON, while stripping personal contact fields to stay privacy-friendly. Over MCP it exposes two tools: whois_lookup for a single domain, IP, or ASN query, and whois_batch_lookup for querying many identifiers in one call, served over Streamable HTTP so agents can be pointed at your own deployment rather than a rate-limited public API.

The underlying service also ships REST routes, Prometheus metrics, health checks, and an OpenAPI 3.1 spec, which makes it easy to reuse the same backend for dashboards or scripts outside the agent context. It is aimed at developers, security researchers, and infrastructure teams who need programmatic domain and IP intelligence, whether that means investigating a suspicious domain, checking who owns an IP block, or building automation around expiring registrations, without hammering a shared public WHOIS API and hitting its rate limits. Deployment is Docker-first, with an optional Redis cache, or a downloadable Go binary configured via a YAML file with environment-variable overrides for caching, rate limiting, and API keys.