domain-check-mcp 1.0.1

RDAP-first domain availability checking MCP server

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

TLD	WHOIS Server
.de	whois.denic.de
.cn	whois.cnnic.cn
.fj	www.whois.fj
.gs	whois.nic.gs
.bayern	whois.nic.bayern
.cat	whois.nic.cat
.eus	whois.nic.eus
.radio	whois.nic.radio
.scot	whois.nic.scot
.sport	whois.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