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WhoisJSON MCP server

by Whoisjson·io.github.Whoisjson/mcp-server·v1.0.3
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WHOIS, DNS, SSL, and domain availability lookups for AI assistants

B72/100grade B
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Safety scan
B72/100

full report

Adoption
New

0 stars42 downloads/wk

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If you have run it, two minutes of your experience saves the next person an afternoon.

WhoisJSON tools (4)

write = sends, deletes, buys or posts

Read from the package source without running it. The installed server may list more.

  • dns_lookup

    Query DNS records for a domain name. Returns all available record types including

  • domain_availability

    Check whether a domain name is available for registration. Returns a boolean

  • ssl_check

    Retrieve and validate the SSL/TLS certificate details for a domain. Returns the issuer,

  • whois_lookup

    Retrieve WHOIS registration data for a domain name. Returns registrar details,

Public scan report

scanner v0.1.9 · 2026-09-27 · same rubric, same numbers if you re-run it

no findings
  • Code scan13 source files scanned25/25
  • –Live reliabilityno gateway calls yet and no remote to proben/a
  • –Tool poisoningtools not inspected (local package is not executed); not countedn/a
  • Auth qualitystatic API keys via environment variables6/15
  • Maintenancelast push 172 days ago8/15
  • Maintainer identityregistry namespace matches repository owner; GitHub account older than a year8/10
Overall 72/100. Components that don't apply are left out of the denominator. Any critical finding is an F.RubricAppeal a findingJSON

How WhoisJSON compares

Against every graded MCP server, from our own scans and uptime checks. Updated after each scan run.

Safety score
72/100
higher than 38% of 48,255 servers
Tools
4
the typical server has 7
Tools that change things
0%
typical: 0%. Fewer write tools means less an agent can break
Downloads a week
42
more than 34% of 12,191 servers with a package

What its tools let an agent do: 4 read

Install WhoisJSON in Claude Code, Cursor or VS Code

Runs npx -y @whoisjson/mcp-server on your machine. Read the scan report first; the gateway never runs local packages.

claude mcp add mcp-server -- npx -y @whoisjson/mcp-server
Add to Cursor

What the publisher says

From the WhoisJSON repository's README, as published. We do not edit it. Read it on GitHub

@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

Prerequisites

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

Installation

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/claudedesktopconfig.json (macOS) or %APPDATA%\Claude\claudedesktopconfig.json (Windows):

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

Cursor

Edit ~/.cursor/mcp.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:

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

Running locally (development)

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

Publishing

npm run build
npm publish --access public

API reference

Full API documentation: whoisjson.com/documentation

Nothing above is checked by us. What we check is on the safety report.

WhoisJSON: common questions

Is WhoisJSON MCP server safe?
Mostly: it is graded B (72/100). Read the WhoisJSON safety report
How do I install WhoisJSON?
It runs on your machine. Copy the Claude Code, Cursor, VS Code or Claude Desktop config from the install section.
Does WhoisJSON need an API key?
Yes. The registry entry asks for WHOISJSON_API_KEY.
Is WhoisJSON maintained?
The last commit was 209 days ago (2026-04-09). The latest release is v1.0.3.
What can I use instead of WhoisJSON?
Servers from other publishers that do the same job: Domain Liveness MCP server.
How does WhoisJSON compare with other MCP servers?
safety score 72/100 (higher than 38% of 48,255 servers); tools 4 (the typical server has 7); tools that change things 0% (typical: 0%. Fewer write tools means less an agent can break). Full comparison.

Alternatives to WhoisJSON

Same job from other publishers: the closest match first, then the best rated.

  • Domain Liveness
    Is this business's website still there? Checks apex and www, and DNS separately from HTTP.
    A