Subdomain Finder MCP

Connect Remote server

claude mcp add --transport http subdomain-finder-mcp https://subdomain-finder-mcp.lipmichal.workers.dev/mcp

{
  "mcpServers": {
    "subdomain-finder-mcp": {
      "url": "https://subdomain-finder-mcp.lipmichal.workers.dev/mcp"
    }
  }
}

{
  "servers": {
    "subdomain-finder-mcp": {
      "type": "http",
      "url": "https://subdomain-finder-mcp.lipmichal.workers.dev/mcp"
    }
  }
}

Settings > Connectors > Add custom connector
URL: https://subdomain-finder-mcp.lipmichal.workers.dev/mcp

Tools 4 found in our last check

• find_subdomains

  Passive subdomain enumeration for a domain from live certificate transparency logs: certspotter (unexpired certificates) with crt.sh as fallback or for expired history. Returns deduplicated hostnames with first seen and last seen issuance dates, certificate count, issuers and wh…

• resolve_subdomains

  Resolve up to 40 hostnames now through Cloudflare DNS over HTTPS (A, AAAA and the CNAME chain). Each host is marked live, nxdomain, no_records or dangling_cname (a CNAME whose target does not exist, a subdomain takeover lead), and CNAME targets on cloud platforms (S3, Azure, Her…

• get_certificate_history

  Certificates logged in certificate transparency for one hostname (or a whole domain with include_subdomains): issuer organisation and DN, not_before and not_after dates, every SAN on the certificate, revocation status and SHA-256 where certspotter has them. Summarises first and…

• summarize_attack_surface

  Reads a domain's subdomains from live certificate transparency and groups them for recon triage: development and test, staging, admin and internal tools, APIs, authentication, mail, remote access (VPN), storage and CDN, legacy and backup. Each group has a count, examples and why…

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