About WhoisJSON
WhoisJSON is an MCP server in the Browser category: wHOIS, DNS, SSL, and domain availability lookups for AI assistants.
Install
claude mcp add whoisjson -- npx -y @whoisjson/mcp-servernpx -y @whoisjson/mcp-serverThis server has no ConduID identity, so agent calls to it are not receipted. Pin the version you install and review the source before granting it credentials.
Tools (4)
dns_lookupAll DNS records for a domain (A, AAAA, MX, NS, TXT, CNAME, SOA, CAA, DMARC…)
Parameters not published.
domain_availabilityCheck if a domain is available for registration
Parameters not published.
ssl_checkSSL/TLS certificate details and validity for a domain
Parameters not published.
whois_lookupWHOIS registration data for a domain (registrar, dates, contacts, nameservers…)
Parameters not published.
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README
@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
README copy captured when this server was indexed; it may lag the repository. The original is authoritative.