Is the WhoisJSON MCP server free to use?

Yes. WhoisJSON is listed on AllMCPs as a free, open Model Context Protocol server you can install into Claude Desktop, Cursor, or any MCP-compatible client.

Is the WhoisJSON MCP server free to use?

Yes. WhoisJSON is listed on AllMCPs as a free, open Model Context Protocol server you can install into Claude Desktop, Cursor, or any MCP-compatible client.

WhoisJSON

WHOIS, DNS, SSL, and domain availability lookups for AI assistants

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 ▾

Install Config Generator

Choose your client

claude_desktop_config.json

{
  "mcpServers": {
    "whoisjson": {
      "command": "npx",
      "args": [
        "-y",
        "whoisjson"
      ]
    }
  }
}

💡 Paste into ~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or %APPDATA%\Claude\claude_desktop_config.json (Windows)

Documentation Overview

@whoisjson/mcp-server

MCP (Model Context Protocol) server for the WhoisJSON API. Exposes WHOIS, DNS, SSL, and domain availability lookups as tools for AI assistants.

Tools

Tool	Description
`whois_lookup`	WHOIS registration data for a domain (registrar, dates, contacts, nameservers…)
`dns_lookup`	All DNS records for a domain (A, AAAA, MX, NS, TXT, CNAME, SOA, CAA, DMARC…)
`ssl_check`	SSL/TLS certificate details and validity for a domain
`domain_availability`	Check if a domain is available for registration

Prerequisites

Sign up at whoisjson.com and copy your API key from the dashboard.
Node.js ≥ 18.

Installation

Terminal

npm install -g @whoisjson/mcp-server
# or run directly with npx (no install needed):
npx @whoisjson/mcp-server

Configuration

Claude Desktop

Edit ~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or
%APPDATA%\Claude\claude_desktop_config.json (Windows):

config.json

{
  "mcpServers": {
    "whoisjson": {
      "command": "npx",
      "args": ["-y", "@whoisjson/mcp-server"],
      "env": {
        "WHOISJSON_API_KEY": "your_api_key_here"
      }
    }
  }
}

Cursor

Edit ~/.cursor/mcp.json:

config.json

{
  "mcpServers": {
    "whoisjson": {
      "command": "npx",
      "args": ["-y", "@whoisjson/mcp-server"],
      "env": {
        "WHOISJSON_API_KEY": "your_api_key_here"
      }
    }
  }
}

Windsurf

Edit ~/.codeium/windsurf/mcp_config.json:

config.json

{
  "mcpServers": {
    "whoisjson": {
      "command": "npx",
      "args": ["-y", "@whoisjson/mcp-server"],
      "env": {
        "WHOISJSON_API_KEY": "your_api_key_here"
      }
    }
  }
}

Running locally (development)

bash

cd mcp-server
npm install
npm run build
WHOISJSON_API_KEY=your_key npm start

Publishing

Terminal

npm run build
npm publish --access public

API reference

Full API documentation: whoisjson.com/documentation

Related MCP Servers

View all in Developer Tools View all alternatives

Frequently Asked Questions about WhoisJSON

Add the following block to your claude_desktop_config.json under mcpServers: "mcpServers": { "whoisjson": { "command": "npx", "args": ["-y", "WhoisJSON"] } }

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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.

★ Featured

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

Documentation Overview

@whoisjson/mcp-server

MCP (Model Context Protocol) server for the WhoisJSON API. Exposes WHOIS, DNS, SSL, and domain availability lookups as tools for AI assistants.

Tools

Tool	Description
`whois_lookup`	WHOIS registration data for a domain (registrar, dates, contacts, nameservers…)
`dns_lookup`	All DNS records for a domain (A, AAAA, MX, NS, TXT, CNAME, SOA, CAA, DMARC…)
`ssl_check`	SSL/TLS certificate details and validity for a domain
`domain_availability`	Check if a domain is available for registration

Prerequisites

Sign up at whoisjson.com and copy your API key from the dashboard.
Node.js ≥ 18.

Installation

Terminal

npm install -g @whoisjson/mcp-server
# or run directly with npx (no install needed):
npx @whoisjson/mcp-server

Configuration

Claude Desktop

Edit ~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or
%APPDATA%\Claude\claude_desktop_config.json (Windows):

config.json

{
  "mcpServers": {
    "whoisjson": {
      "command": "npx",
      "args": ["-y", "@whoisjson/mcp-server"],
      "env": {
        "WHOISJSON_API_KEY": "your_api_key_here"
      }
    }
  }
}

Cursor

Edit ~/.cursor/mcp.json:

config.json

{
  "mcpServers": {
    "whoisjson": {
      "command": "npx",
      "args": ["-y", "@whoisjson/mcp-server"],
      "env": {
        "WHOISJSON_API_KEY": "your_api_key_here"
      }
    }
  }
}

Windsurf

Edit ~/.codeium/windsurf/mcp_config.json:

config.json

{
  "mcpServers": {
    "whoisjson": {
      "command": "npx",
      "args": ["-y", "@whoisjson/mcp-server"],
      "env": {
        "WHOISJSON_API_KEY": "your_api_key_here"
      }
    }
  }
}

Running locally (development)

bash

cd mcp-server
npm install
npm run build
WHOISJSON_API_KEY=your_key npm start

Publishing

Terminal

npm run build
npm publish --access public

API reference

Full API documentation: whoisjson.com/documentation