RDAP-first domain availability checking MCP server
Project description
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
- Extracts the TLD from the domain name
- Routes to the appropriate adapter (RDAP or WHOIS)
- RDAP: HTTP lookup — 404 means available, 200 means registered
- WHOIS: TCP port 43 lookup — pattern matching on the response
- 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
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