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Domain Checker

by nach-dakwale
OverviewSchemaSourceRelated ServersDiscussionsAdmin
Python
Remote

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"
    }
  }
}

Related MCP server: DomainFinder MCP Server

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

This server cannot be deployed

One endpoint for every MCP toolRayrun runs every MCP server behind one URL and holds the credentials. Each call is decided per client, tool, and argument, then recorded.ray.runAd

Maintenance

ActivityInactive
ResponsivenessNo issues

Resources

Related MCP Connectors

Related MCP Servers

  • Domain Search MCP

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  • DomainFinder MCP Server

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