Domain Check

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

Quick Install

Automated & IDE Setup

Copy the AI prompt to install this server into Claude Code, Cursor, or another agent — or use 1-click editor setup below.

Add to Cursor Add to VS Code

Manual Client & Custom JSON ConfigExpand JSON ▾

Client Config & Setup

Choose your client or environment

Target File:~/Library/Application Support/Claude/claude_desktop_config.json

claude_desktop_config.json

{
  "mcpServers": {
    "domain-check-3": {
      "command": "npx",
      "args": [
        "-y",
        "domain-check-3"
      ]
    }
  }
}

💡 Paste the JSON block into your client's configuration file under mcpServers, then restart the application.

Documentation Overview

domain-check-mcp

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

Installation

bash

uvx domain-check-mcp

Usage in .mcp.json

config.json

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

Tools

check_domain — Check if a domain name is available for registration

Example

Code

check_domain("example.com")

Returns:

config.json

{
  "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

bash

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

Read the full README →View source on GitHub →

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Frequently Asked Questions about Domain Check

Add the following block to your claude_desktop_config.json under mcpServers: "mcpServers": { "domain-check": { "command": "npx", "args": ["-y", "Domain Check"] } }

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Technical Specs & Signals

CategoryDeveloper Tools

27Quality signal: Emerging · 27/100How this signal is calculated ▾

Server availabilityNot measured

Not scored for repo-hosted servers — we can't reach the running server, only its GitHub page. Hosted MCP endpoints are health-checked live.

Verified ownership8/20

Documentation & tools11/30

Adoption & activity1/15

Community engagement0/10

A guidance signal from public completeness & health data — not a user rating. New listings start lower and rise as they add docs, get verified, and grow adoption. Signals we can't observe for a listing are skipped, not counted against it.

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More in 💻 Developer Tools →Best MCP servers for Developers →Alternatives to Domain Check →Install in Claude Desktop Install in Cursor Install in VS Code

Documentation Overview

domain-check-mcp

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

Installation

bash

uvx domain-check-mcp

Usage in .mcp.json

config.json

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

Tools

check_domain — Check if a domain name is available for registration

Example

Code

check_domain("example.com")

Returns:

config.json

{
  "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

bash

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