Domain Lookup MCP server

A free remote Model Context Protocol server that gives AI assistants live domain data: availability confirmed by the registry itself, RDAP/WHOIS registration data, DNS records and SSL certificates.

Endpoint (Streamable HTTP): https://domainlookup.dev/mcp · Get a free API key

Connect

Claude Code

claude mcp add --transport http domainlookup https://domainlookup.dev/mcp \
  --header "Authorization: Bearer dlk_your_key"

Codex

export DOMAINLOOKUP_API_KEY="dlk_your_key"
codex mcp add domainlookup --url https://domainlookup.dev/mcp --bearer-token-env-var DOMAINLOOKUP_API_KEY

Cursor (~/.cursor/mcp.json)

{
  "mcpServers": {
    "domainlookup": {
      "url": "https://domainlookup.dev/mcp",
      "headers": {
        "Authorization": "Bearer dlk_your_key"
      }
    }
  }
}

VS Code (.vscode/mcp.json)

{
  "servers": {
    "domainlookup": {
      "type": "http",
      "url": "https://domainlookup.dev/mcp",
      "headers": {
        "Authorization": "Bearer dlk_your_key"
      }
    }
  }
}

claude.ai, Claude Desktop and ChatGPT connectors

Add a custom connector with this URL:
https://domainlookup.dev/mcp?key=dlk_your_key

Tool calls need a free API key: create one here in a few seconds, no account or password. Replace dlk_your_key above with it. Each key allows 300 requests per minute.

Tools

check_domain_availability: Check whether a domain is available to register. Asks the registry over RDAP (authoritative); falls back to DNS when the TLD has no RDAP server. Premium/reserved names may still be unavailable at registrars.
bulk_check_availability: Check availability of up to 10 domains at once.
suggest_domains: Check one name across many TLDs (acme → acme.com, acme.io, acme.ai, …) and report which are available. Pass tlds to choose the list.
whois_lookup: Registration data from the registry over RDAP (modern WHOIS): registrar, abuse contact, creation/expiry/update dates, EPP status codes, nameservers, DNSSEC, domain age. Registrant details are usually redacted by the registry.
domain_age: How old a domain is (registration date, age in days/years) and how many days until it expires.
dns_lookup: DNS records of a name via Cloudflare DNS-over-HTTPS. Omit record_type to get all of A, AAAA, CNAME, MX, NS, TXT, SOA, CAA.
ssl_certificates: SSL/TLS certificates issued for a domain, from Certificate Transparency logs (crt.sh): issuer, validity, names, plus every hostname seen on them (a quick subdomain inventory). crt.sh can be slow.

Web app · llms.txt · Full API and MCP reference

Domain Lookup MCP server

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