Domain Checker MCP

An MCP (Model Context Protocol) server that checks domain availability using RDAP (Registration Data Access Protocol) with WHOIS fallback.

Features

• Check single domain availability
• Batch check multiple domains in parallel
• Prioritizes RDAP for domain lookups
• Falls back to WHOIS when RDAP is unavailable
• Configurable parallel workers (default: 4)
• Retry mechanism with exponential backoff for rate-limited responses
• Enhanced domain status detection (available, taken, unknown, rate_limited)
• Extract domain information (registrar, expiration date, days until expiration)
• Null registrationData detection for better availability accuracy
• Efficient response mode - raw RDAP/WHOIS data excluded by default for faster responses

MCP Configuration

Using npm package

Add this server to your MCP client configuration:

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

Using local installation

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

Installation

From npm

npm install -g domain-checker-mcp

From source

git clone https://github.com/yourusername/domain-checker-mcp.git
cd domain-checker-mcp
pnpm install
pnpm build

Usage

Running the MCP server

pnpm start

Available Tools

All tools support an optional includeRawResponse parameter (boolean, default: false) to control whether raw RDAP/WHOIS data is included in responses. Raw responses are automatically included for suspicious cases (unknown status, rate limits, errors).

1. check_domain - Check if a single domain is available

   • Input:
     • domain (string) - The domain name to check
     • includeRawResponse (boolean, optional) - Include raw response data (default: false)

2. check_domains_batch - Check multiple domains in parallel

   • Input:
     • domains (string[]) - Array of domain names to check
     • concurrency (number, optional) - Number of parallel workers (1-10, default: 4)
     • includeRawResponse (boolean, optional) - Include raw response data (default: false)

3. check_name_extensions - Check a single name with multiple extensions

   • Input:
     • name (string) - The domain name without extension (e.g., "example")
     • extensions (string[]) - Array of extensions to check (e.g., ["com", "net", "org"])
     • concurrency (number, optional) - Number of parallel workers (1-10, default: 4)
     • includeRawResponse (boolean, optional) - Include raw response data (default: false)

4. check_names_extensions - Check multiple names with multiple extensions

   • Input:
     • names (string[]) - Array of domain names without extensions
     • extensions (string[]) - Array of extensions to check for each name
     • concurrency (number, optional) - Number of parallel workers (1-10, default: 4)
     • includeRawResponse (boolean, optional) - Include raw response data (default: false)

Response Format

Single domain check returns:

{
  "domain": "example.com",
  "available": false,
  "status": "taken",
  "method": "rdap",
  "registrationData": { ... },
  "domainInfo": {
    "registrar": "Example Registrar Inc.",
    "expirationDate": "2025-12-31T23:59:59Z",
    "daysUntilExpiration": 365,
    "creationDate": "2020-01-01T00:00:00Z",
    "lastUpdated": "2024-01-15T12:00:00Z"
  }
}

Batch check returns:

{
  "total": 5,
  "available": 2,
  "taken": 2,
  "errors": 0,
  "rateLimited": 1,
  "unknown": 0,
  "results": [...]
}

Name with extensions check returns:

{
  "name": "example",
  "total": 3,
  "available": 1,
  "taken": 2,
  "errors": 0,
  "rateLimited": 0,
  "unknown": 0,
  "results": [...]
}

Multiple names with extensions returns:

{
  "totalNames": 2,
  "totalExtensions": 3,
  "totalChecks": 6,
  "availableTotal": 2,
  "takenTotal": 3,
  "errorsTotal": 0,
  "rateLimitedTotal": 1,
  "unknownTotal": 0,
  "resultsByName": {
    "example": {
      "total": 3,
      "available": 1,
      "taken": 2,
      "errors": 0,
      "rateLimited": 0,
      "unknown": 0,
      "domains": [...]
    },
    ...
  }
}

Publishing

To publish a new version:

1. Update the version in package.json
2. Commit your changes
3. Create and push a new tag:

   git tag v0.1.0
   git push origin v0.1.0

4. GitHub Actions will automatically publish to npm

Requirements

• Set NPM_TOKEN secret in your GitHub repository settings
• Tag must start with 'v' (e.g., v0.1.0, v1.0.0)

License

MIT