Summary
Routes domain availability checks through RDAP for 500+ TLDs, with WHOIS fallback for extensions like .de and .cn. Exposes a single check_domain tool that returns structured availability status. RDAP queries use HTTP lookups (404 for available, 200 for registered), while WHOIS hits port 43 and pattern matches responses. The RDAP registry pulls from IANA's bootstrap data, covering major gTLDs and ccTLDs. Reach for this when you need Claude to validate domain names during brainstorming sessions, batch check availability for project names, or verify domains without switching contexts to a registrar UI.
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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
Featured
Fastest browser for AI agents to run web automation tasks, always free.
Download Free life-time →Notes, actions and memory. Without a meeting bot. First month 100% off.
Download for free →belt cli automatically finds the best tools and skills for your agent. image, video, music, tts...
one prompt install →Connect your Claude agent to live crypto prices and trading routes via 1inch
Get the MCP →Block distracting apps from your iPhone permanently without a 3rd party app. Free and open source.
Block now (100% free) →