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Domain Check

Official registry Other

Check domain availability across 500+ TLDs. Single and bulk checks with UI.

Source code Documentation

What can you do with Domain Check?

  • check_domain — Check if a domain name is available for registration

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

PYPI package domain-check-mcp
Claude Code 
claude mcp add domain-check -- uvx domain-check-mcp==1.1.1
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "domain-check": {
            "command": "uvx",
            "args": [
                "domain-check-mcp==1.1.1"
            ]
        }
    }
}

Documentation

From the project's README on GitHub, refreshed weekly. Links open on GitHub.

Contents
  1. domain-check-mcp
  2. Installation
  3. Usage in .mcp.json
  4. Tools
  5. Supported TLDs
  6. How it works
  7. Development
  8. License

domain-check-mcp

MCP server for checking domain name availability. Supports 500+ TLDs via RDAP, with WHOIS fallback for .de and .cn.

Installation

uvx domain-check-mcp

Usage in .mcp.json

{
  "mcpServers": {
    "domain-check": {
      "command": "uvx",
      "args": ["domain-check-mcp"]
    }
  }
}

Tools

  • check_domain — Check if a domain name is available for registration
Example
check_domain("example.com")

Returns:

{
  "domain": "example.com",
  "available": false,
  "status": "registered"
}

Supported TLDs

Via RDAP (500+)

All major gTLDs and many ccTLDs with RDAP support, sourced from the IANA RDAP Bootstrap:

.com, .net, .org, .info, .app, .dev, .io, .xyz, .site, .shop, .uk, .fr, .nl, .pl, .consulting, .cloud, .tech, .blog, .store, .online, and many more.

Via WHOIS
TLDWHOIS Server
.dewhois.denic.de
.cnwhois.cnnic.cn
.fjwww.whois.fj
.gswhois.nic.gs
.bayernwhois.nic.bayern
.catwhois.nic.cat
.euswhois.nic.eus
.radiowhois.nic.radio
.scotwhois.nic.scot
.sportwhois.nic.sport

How it works

  1. Extracts the TLD from the domain name
  2. Routes to the appropriate adapter (RDAP or WHOIS)
  3. RDAP: HTTP lookup — 404 means available, 200 means registered
  4. WHOIS: TCP port 43 lookup — pattern matching on the response
  5. Returns a structured result with availability status

Development

git clone https://github.com/stucchi/domain-check-mcp.git
cd domain-check-mcp
python -m venv .venv
source .venv/bin/activate
pip install -e ".[dev]"
pytest

License

MIT

Frequently asked questions

What is Domain Check?

Check domain availability across 500+ TLDs. Single and bulk checks with UI.

How do I install Domain Check?

It runs on your machine. In Claude Code: claude mcp add domain-check -- uvx domain-check-mcp==1.1.1. For other clients, paste the JSON configuration from this page into their MCP settings.

Does Domain Check need an API key?

Its registry entry lists no required key or secret. Some features may still need an account with the service it connects to.

Is Domain Check open source?

Its code is public on GitHub, but the repository does not declare a standard license.

Who maintains Domain Check?

It is published by stucchi. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.