domain-mcp

An MCP (Model Context Protocol) server for domain name availability checking, WHOIS lookups, and domain suggestions — no API key required.

Uses RDAP for availability checks, real WHOIS servers via TCP port 43 for registration records, and domainr.com for domain suggestions.

Features

Search Domains — Get domain suggestions across 25+ popular TLDs (.com, .io, .dev, .ai, etc.) with availability
Check Domain — Detailed availability status via RDAP — registrar, creation/expiry dates, nameservers
Bulk Check — Check up to 20 domains at once in a comparison table
WHOIS Lookup — Full WHOIS records via TCP port 43 — registrar, registrant, dates, status, nameservers, abuse contacts
Zero Config — No API key, no sign-up, works out of the box

cd domain-mcp
npm install
npm run build

Add to your VS Code settings.json or Claude Desktop config:

{
  "mcpServers": {
    "domain-mcp": {
      "command": "node",
      "args": ["path/to/domain-mcp/dist/index.js"]
    }
  }
}

No environment variables or API keys needed.

Search for domain name suggestions with availability status.

Parameter	Type	Required	Description
query	string	✅	Brand name, keyword, or domain to search
tlds	string[]	—	Optional TLDs to check (e.g. `["com", "io"]`)

Check availability and registration details of a specific domain via RDAP.

Parameter	Type	Required	Description
domain	string	✅	Full domain name (e.g. `example.io`)

Bulk check multiple domains at once.

Parameter	Type	Required	Description
domains	string[]	✅	Array of domains to check (max 20)

Perform a WHOIS lookup via TCP port 43. Returns registrar, registrant, dates, nameservers, status flags, and abuse contacts.

Parameter	Type	Required	Description
domain	string	✅	Full domain name (e.g. `google.com`)
raw	boolean	—	If `true`, returns the full raw WHOIS text dump

Domain suggestions are fetched from domainr.com (the same free web UI). Falls back to generating popular TLD combinations.
Availability checks use RDAP — the official, free, open replacement for WHOIS. If RDAP has no record, a DNS lookup confirms the domain doesn't exist.
Registration details (registrar, dates, nameservers) come from the RDAP response for registered domains.
WHOIS records are fetched via direct TCP connections to WHOIS servers on port 43 — the same protocol used by the whois CLI tool. Supports 45+ TLDs out of the box and auto-discovers others via IANA. Automatically follows referral servers (e.g. Verisign → registrar-specific WHOIS).

MIT