About DomainCheckr
DomainCheckr is an MCP server in the Browser category: check domain name availability via RDAP. Single, bulk, and smart suggestions. No API key needed.
Install
git clone https://github.com/nach-dakwale/domaincheckr-mcpThis server has no ConduID identity, so agent calls to it are not receipted. Pin the version you install and review the source before granting it credentials.
Tools (3)
check_domainCheck if a single domain name is available for registration. Returns registrar, creation date, expiry, and nameservers for taken domains.
Parameters not published.
check_domains_bulkCheck up to 50 domain names at once. Returns per-domain results with summary counts.
Parameters not published.
suggest_domainsGenerate and check domain name ideas for a keyword or business description. Creates 15 variations across .com, .io, .ai, .dev, .co and common prefixes/suffixes.
Parameters not published.
Ask AI
Ask AI about DomainCheckr
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README
DomainCheckr MCP Server
Check domain name availability instantly using RDAP. No API key or installation required. Works as a remote MCP server.
Quick Start
This is a remote MCP server -- no local installation needed. Just add the URL to your MCP client.
Claude Desktop
Add to your claude_desktop_config.json:
{
"mcpServers": {
"domaincheckr": {
"url": "https://domaincheckr.fly.dev/mcp"
}
}
}
Config file location:
- macOS:
~/Library/Application Support/Claude/claude_desktop_config.json - Windows:
%APPDATA%\Claude\claude_desktop_config.json
Claude Code
claude mcp add domaincheckr --transport http https://domaincheckr.fly.dev/mcp
Cursor
Add to ~/.cursor/mcp.json:
{
"mcpServers": {
"domaincheckr": {
"url": "https://domaincheckr.fly.dev/mcp"
}
}
}
Windsurf
Add to ~/.codeium/windsurf/mcp_config.json:
{
"mcpServers": {
"domaincheckr": {
"url": "https://domaincheckr.fly.dev/mcp"
}
}
}
Tools
| Tool | Description |
|---|---|
check_domain |
Check if a single domain name is available for registration. Returns registrar, creation date, expiry, and nameservers for taken domains. |
check_domains_bulk |
Check up to 50 domain names at once. Returns per-domain results with summary counts. |
suggest_domains |
Generate and check domain name ideas for a keyword or business description. Creates 15 variations across .com, .io, .ai, .dev, .co and common prefixes/suffixes. |
Example Prompts
Try asking your AI assistant:
- "Is coolstartup.com available?"
- "Check if these domains are available: acmecorp.com, acmehq.com, getacme.com"
- "Find me a domain for a pet grooming business"
- "I'm building a fintech app called PayFlow, find me a domain"
How It Works
DomainCheckr uses the RDAP protocol (Registration Data Access Protocol) to check domain availability in real time. RDAP is the modern replacement for WHOIS, standardized by the IETF.
- Queries Verisign RDAP for .com/.net domains
- Queries PIR RDAP for .org domains
- Falls back to rdap.org for all other TLDs
- HTTP 404 = available, HTTP 200 = taken
No scraping, no third-party APIs, no rate-limited services. Direct registry queries.
REST API
The same service is available as a REST API for building your own integrations or ChatGPT Actions.
| Endpoint | Description |
|---|---|
GET /check/{domain} |
Check a single domain |
POST /check |
Bulk check (body: {"domains": ["a.com", "b.com"]}, max 50) |
GET /suggest?keyword=fintech |
Generate and check domain ideas |
GET /health |
Health check |
GET /docs |
Interactive API documentation |
GET /openapi.json |
OpenAPI spec (for ChatGPT Actions) |
Base URL: https://domaincheckr.fly.dev
License
MIT
README copy captured when this server was indexed; it may lag the repository. The original is authoritative.