FastDomainCheck

A Model Context Protocol implementation for checking domain name registration status in bulk.

Related Links

• FastDomainCheck Online Service - Check domain registration status in bulk online
• MCP Server Documentation - Detailed project documentation and technical specifications

Introduction

FastDomainCheck MCP Server is a Model Context Protocol (MCP) server implementation that enables secure, two-way connections between AI tools (like Claude) and domain availability data. By following the open MCP standard, it ensures seamless compatibility with various AI-powered applications.

Features

• Bulk domain registration status checking
• Dual verification using WHOIS and DNS
• Support for IDN (Internationalized Domain Names)
• Concise output format
• Built-in input validation and error handling

Tool Documentation

check_domains

Check registration status for multiple domain names.

Input Format

{
  "domains": ["example.com", "test.com"]
}

Parameters:

• domains: Array of strings containing domain names to check
  • Maximum length of 255 characters per domain
  • Maximum 50 domains per request
  • No empty domain names allowed

Output Format

{
  "results": {
    "example.com": {
      "registered": true
    },
    "test.com": {
      "registered": false
    }
  }
}

Response Fields:

• results: Object with domain names as keys and check results as values
  • registered: Boolean
    • true: Domain is registered
    • false: Domain is available

Error Handling

The tool will return an error in the following cases:

1. Empty domains list
2. More than 50 domains in request
3. Empty domain name
4. Domain name exceeding 255 characters
5. Result serialization failure

Error Response Format:

{
  "error": "Error: domains list cannot be empty"
}

Usage Examples

Check multiple domains:

Request

{
  "domains": ["example.com", "test123456.com"]
}

Response

{
  "results": {
    "example.com": {
      "registered": true
    },
    "test123456.com": {
      "registered": false
    }
  }
}

Performance Considerations

1. Domain checks are executed sequentially, taking approximately 0.3-1 second per domain
2. Maximum 50 domains per request to prevent resource exhaustion
3. WHOIS query timeout set to 10 seconds
4. DNS query fallback when WHOIS query fails

Error Handling Strategy

1. Input Validation: Comprehensive validation before processing
2. Dual Verification: WHOIS primary, DNS fallback
3. Timeout Management: Reasonable timeouts for all network operations
4. Detailed Error Messages: Clear error descriptions for troubleshooting

Usage

Download Binary

Download the binary file from the release page. https://github.com/bingal/FastDomainCheck-MCP-Server/releases

For Mac/Linux

chmod +x FastDomainCheck-MCP-Server

MCP Server Settings

Configuring FastDomainCheck MCP in Claude Deskto

Modify your claude-desktop-config.json file as shown below

Mac/Linux

{
  "mcpServers": {
    "fastdomaincheck": {
      "command": "/path/to/FastDomainCheck-MCP-Server",
      "args": []
    }
  }
}

Windows

{
  "mcpServers": {
    "fastdomaincheck": {
      "command": "path/to/FastDomainCheck-MCP-Server.exe",
      "args": []
    }
  }
}

Python version

The Python version of this project is available at fastdomaincheck-mcp-server.

MCP Server Settings

{
  "mcpServers": {
    "fastdomaincheck": {
      "command": "uvx",
      "args": [
        "fastdomaincheck-mcp-server"
      ]
    }
  }
}

Development Guide

Requirements

• Go 1.16 or higher
• Network connectivity (for WHOIS and DNS queries)
• Dependencies:
  • github.com/metoro-io/mcp-golang
  • Other project-specific dependencies

Build

# Linux
go build -o FastDomainCheck-MCP-Server

# Windows
go build -o FastDomainCheck-MCP-Server.exe