Domain Availability Checker MCP

An MCP (Model Context Protocol) server that checks domain availability for registration using RDAP APIs.

Supported TLDs

Currently supported:

• .com - via Verisign RDAP API
• .net - via Verisign RDAP API

The architecture is extensible - see Adding a New TLD below.

Installation

Usage with Claude Desktop

Add to your Claude Desktop configuration (~/Library/Application Support/Claude/claude_desktop_config.json on macOS):

{
  "mcpServers": {
    "domain-checker": {
      "command": "npx",
      "args": ["-y", "github:gotchykid/domain-availability-checker-mcp"]
    }
  }
}

From Source

# Clone the repository
git clone https://github.com/gotchykid/domain-availability-checker-mcp.git
cd domain-availability-checker-mcp

# Install dependencies
npm install

# Build
npm run build

Then add to Claude Desktop config:

{
  "mcpServers": {
    "domain-checker": {
      "command": "node",
      "args": ["/path/to/domain-availability-checker-mcp/build/index.js"]
    }
  }
}

Tools

check_domain

Check if a domain is available for registration.

Parameters:

• domain (string): Domain name to check (e.g., "example.com" or "example.net")

Returns:

• Domain availability status
• If registered: registrar, creation date, expiration date, nameservers, and status

Development

# Watch mode for development
npm run watch

# Test with MCP Inspector
npm run inspector

Adding a New TLD

To add support for a new TLD (e.g., .org):

1. Create a new file src/checkers/org.ts
2. Implement the DomainChecker interface
3. Export the checker as default

Example:

import { DomainChecker, DomainCheckResult } from "../types.js";
import {
  RdapResponse,
  parseRdapResponse,
  createAvailableResult,
} from "./rdap-utils.js";

const RDAP_BASE_URL = "https://rdap.publicinterestregistry.org/rdap/domain/";
const TLD = "org";

const orgChecker: DomainChecker = {
  tld: TLD,

  async check(domain: string): Promise<DomainCheckResult> {
    const normalizedDomain =
      domain.toLowerCase().replace(/\.org$/, "") + ".org";

    try {
      const response = await fetch(`${RDAP_BASE_URL}${normalizedDomain}`);

      if (response.status === 404) {
        return createAvailableResult(normalizedDomain, TLD);
      }

      if (!response.ok) {
        throw new Error(`RDAP request failed with status ${response.status}`);
      }

      const data: RdapResponse = await response.json();
      return parseRdapResponse(data, normalizedDomain, TLD);
    } catch (error) {
      if (error instanceof Error && error.message.includes("404")) {
        return createAvailableResult(normalizedDomain, TLD);
      }
      throw error;
    }
  },
};

export default orgChecker;

The registry auto-discovers checker files on startup - no other changes needed.

License

MIT