Domain Lookup MCP Server

The Domain Lookup MCP is a lightweight server designed to bridge AI assistants with real‑time DNS resolution services. It exposes a minimal set of tools that let Claude, Gemini, or other MCP‑compatible agents query domain information—such as IP addresses, MX records, and WHOIS data—directly from within a conversation. This capability removes the need for developers to write custom DNS‑lookup logic or maintain external APIs, enabling instant access to authoritative domain data without leaving the assistant’s context.

Why It Matters

When building AI‑powered applications that need to verify domain ownership, validate email deliverability, or perform security checks, developers often face the pain point of integrating external DNS services. The Domain Lookup MCP solves this by offering a single, consistent interface that adheres to the Model Context Protocol. Agents can call the server’s tools as if they were native language functions, allowing developers to embed domain validation steps into prompts or workflows without handling authentication or rate limiting themselves. This reduces boilerplate code, improves reliability, and keeps the assistant’s knowledge fresh with live DNS responses.

Core Features

• Domain Resolution – Fetches A/AAAA records for any queried hostname, returning the current IP addresses.
• Mail Exchange (MX) Lookup – Provides MX records to help assess email routing and deliverability.
• WHOIS Retrieval – Supplies registrar information, creation dates, and expiry details for ownership verification.
• JSON‑Friendly Output – All responses are structured as JSON, making it straightforward for agents to parse and present data.
• Error Handling – Gracefully reports lookup failures or unsupported record types, allowing the assistant to offer fallback suggestions.

Use Cases

• Email Verification Bots – An AI assistant can confirm that a domain’s MX records point to legitimate mail servers before sending transactional emails.
• Security Audits – Developers can quickly check whether a domain is registered, its age, and if it’s associated with suspicious registrars.
• Chat‑Based Troubleshooting – Support agents can ask the assistant “What’s the IP for example.com?” and receive an instant, accurate answer within the chat.
• Compliance Checks – Legal teams can verify domain ownership and expiration dates as part of data residency or GDPR compliance workflows.

Integration with AI Workflows

The server registers its tools via MCP’s standard endpoint. An assistant can invoke them using natural language prompts such as “Look up the IP address for ” or “Show me the MX records for .” The assistant’s runtime automatically passes parameters, receives JSON responses, and can embed the results into subsequent steps—whether that’s generating a report, triggering another API call, or simply displaying the data to the user. Because MCP handles context propagation, developers can chain domain lookups with other tools (e.g., vulnerability scanners) without manual state management.

Unique Advantages

Unlike generic DNS libraries, the Domain Lookup MCP is MCP‑native, ensuring seamless compatibility across all major AI assistants that support the protocol. Its minimal footprint means it can run in constrained environments—such as edge devices or serverless functions—without sacrificing performance. Additionally, by centralizing DNS queries in a single service, teams can monitor usage, enforce rate limits, and log results for auditability, all while keeping the assistant’s logic clean and focused on higher‑level tasks.