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DomainCheckr

nach-dakwale/domaincheckr-mcp

Queries RDAP registries directly to check domain availability without scraping or API keys. Exposes three tools: check single domains, bulk check up to 50 at once, or generate smart suggestions from keywords that return variations across .com, .io, .ai, .dev, and .co with common prefixes. Uses Verisign RDAP for .com/.net, PIR for .org, and rdap.org for everything else. Runs as a remote server on Fly.dev so there's nothing to install locally. Useful when you're naming a project, validating user input for domain fields, or building registration flows. Also works as a standalone REST API with OpenAPI docs if you need it outside MCP contexts.

tools
3
transport
HTTP
last updated
Mar 13, 2026
View on GitHub

Install

From registry metadata
$ npx add-mcp https://domaincheckr.fly.dev/mcp --name domaincheckr

Run in your terminal. add-mcp asks which agents to add it to (Claude Code, Codex, Cursor and more). Add -g to install it for every project.

Review the command, arguments and environment values before installing. MCP servers run with your local permissions.

Other ways

Claude Code

$ claude mcp add --transport http domaincheckr https://domaincheckr.fly.dev/mcp

Run in your terminal. Add --scope user to make it available in every project.

Tools

Verified live · 3 tools

Verified live against the running server on Nov 6, 2026.

echoEchoes the provided text back to the caller.1 params

Echoes the provided text back to the caller.

Parameters* required
text*string
Text to echo back
addAdds two numbers and returns the sum.2 params

Adds two numbers and returns the sum.

Parameters* required
a*number
b*number
server_timeReturns the current server time (ISO 8601, UTC).

Returns the current server time (ISO 8601, UTC).

No parameters. Call it with no arguments.

Sponsors

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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

View the full README on GitHub

Details

Repository
github.com/nach-dakwale/domaincheckr-mcp
Transport
HTTP
Registry
MCP registry, active
Tools verified
Nov 6, 2026

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