Whois, Dns, Ssl, And Domain Availability Lookups For Ai Assistants
WhoisJSON MCP Server exposes four domain intelligence tools directly inside Claude, Cursor, and Windsurf — no code required.
whois_lookup: Full WHOIS registration record for any domain — registrar, creation and expiry dates, nameservers, registrant contacts, and DNSSEC status.
dns_lookup: All DNS records in a single call — A, AAAA, MX, TXT, CNAME, NS, SOA, CAA, DMARC, and more. Useful for mail server audits, SPF/DKIM verification, and infrastructure mapping.
ssl_check: TLS certificate details including issuer, expiry date, Subject Alternative Names, and full chain validity. Detect expired or misconfigured certificates instantly.
domain_availability: Instant registration availability check for any TLD. Returns a clear registered/available status.
Your WhoisJSON API key works identically for the REST API and the MCP server. 1,000 free requests/month, no credit card required. Get your API key at whoisjson.com.
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
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):
{
"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
Server Config
{
"mcpServers": {
"whoisjson": {
"command": "npx",
"args": [
"-y",
"@whoisjson/mcp-server"
],
"env": {
"WHOISJSON_API_KEY": "YOUR_API_KEY"
}
}
}
}Project Info
Created At
2 months agoUpdated At
2 months agoAuthor Name
WhoisjsonStar
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