fastdomaincheck -python

FastDomainCheck MCP Server is a Python-based MCP service that exposes a domain availability checker as an MCP tool. It supports checking the registration status of one or many domain names, using a dual verification approach (WHOIS and DNS) and includes support for Internationalized Domain Names (IDN). The primary tool you’ll use is check_domains, which accepts a JSON payload with a list of domain names and returns a per-domain registration status. This makes it suitable for batch processing and integration into other workflows that need to verify domain availability quickly.

To use the server, send a check_domains request via MCP to obtain results for each domain. The tool validates inputs (e.g., non-empty list, max 50 domains per request, each domain <= 255 characters) and returns a structured response indicating whether each domain is already registered. If any input validation fails, an error response with a descriptive message is returned. You can rely on this behavior to implement error handling in your automation or UI layer.

Prerequisites:

• Python 3.8+ installed
• Access to install Python packages (pip)

1. Create and activate a Python virtual environment (recommended):

python3 -m venv venv
source venv/bin/activate  # on Unix/macOS
venv\Scripts\activate     # on Windows

2. Install the MCP server package from PyPI or your repository (example uses a hypothetical package name corresponding to the server):

pip install fastdomaincheck-mcp-server

3. Verify installation by running the server entry point or module (adjust to your actual CLI entry if provided):

uvx --help

4. Run the server locally (adjust command as needed for your environment):

uvx fastdomaincheck-mcp-server

5. Optional: configure environment variables for DNS/WHOIS behavior if required by the server (see additional_notes for details).

Tips and notes:

• This is a Python MCP server exposed via the uvx command (Python/uv). Ensure uvx is installed and accessible in your PATH.
• The check_domains tool expects JSON input with a domains array. Enforce the 50-domain limit to avoid errors.
• For IDN support, ensure the server environment handles punycode/IDN encoding as needed for your deployments.
• If you integrate with downstream systems, implement robust error handling for the error responses such as empty domains or domain length violations.
• When deploying in production, consider rate limiting and caching results if you plan to run frequent domain checks to reduce latency and WHOIS lookups.