Domain Lookup MCP

Domain Lookup MCP is a lightweight server that exposes the ability to resolve domain names through RDAP (RFC 7480) and, if necessary, fall back to traditional WHOIS lookups. By providing a unified, machine‑readable interface for domain metadata, it allows AI assistants to query ownership, registration dates, status flags, and other registry information without the need for custom parsing logic.

What Problem Does It Solve?

Many AI assistants require contextual knowledge about a domain—such as who owns it, when it was registered, or whether it is currently active—to answer questions about web services, cybersecurity threats, or compliance. Traditional WHOIS queries are often slow, inconsistent across registrars, and require handling various output formats. RDAP offers a modern, standardized JSON response, but not all registries support it or provide complete data. This MCP server abstracts those complexities: a single call returns consistent, structured information regardless of the underlying protocol.

How It Works and Why It Matters

The server accepts a domain name as input, performs an RDAP query first, and if the response is incomplete or unavailable, initiates a WHOIS lookup. The resulting data—such as registrant details, expiration dates, and status codes—is returned in a clean JSON format. Developers can therefore integrate domain intelligence into their AI workflows with minimal code, focusing on higher‑level logic rather than low‑level network interactions.

Key benefits include:

• Protocol Agnostic: Handles RDAP and WHOIS transparently, ensuring coverage across all registries.
• Consistent Output: Normalizes disparate data into a single JSON schema, simplifying downstream processing.
• Performance Optimized: Caches RDAP responses where possible and streams WHOIS data efficiently.

Use Cases

• Cybersecurity Investigations: Quickly retrieve registration history and owner information when analyzing suspicious domains.
• Compliance Audits: Verify domain ownership and expiration dates for regulatory reporting or trademark checks.
• AI‑Powered Web Analysis: Enable assistants to answer questions like “Who owns example.com?” or “When did example.org expire?”
• Threat Intelligence Feeds: Enrich threat data with domain metadata to correlate indicators of compromise.

Integration in AI Workflows

An MCP client can declare the as a resource and invoke it with a simple prompt. The assistant can then parse the JSON response, extract relevant fields, and embed them into natural language replies. Because the server exposes a standard MCP interface, it can be composed with other tools—such as DNS record lookups or certificate transparency scanners—to build comprehensive domain‑analysis pipelines.

Unique Advantages

• Simplicity: No need to manage separate RDAP and WHOIS clients; the MCP server consolidates them.
• Extensibility: Developers can add custom parsing or enrichment logic inside the server without changing client code.
• Open Source: Written in Go, the binary is small and can be deployed on a variety of platforms, from local machines to cloud functions.

By delivering reliable, structured domain data in a single, AI‑friendly call, the Domain Lookup MCP empowers developers to enrich conversational agents with authoritative internet registry information and streamline security or compliance workflows.