Subdomain API

Connect Remote server

claude mcp add --transport http subdomains https://api.subdomain.app/mcp

{
  "mcpServers": {
    "subdomains": {
      "url": "https://api.subdomain.app/mcp"
    }
  }
}

{
  "servers": {
    "subdomains": {
      "type": "http",
      "url": "https://api.subdomain.app/mcp"
    }
  }
}

Settings > Connectors > Add custom connector
URL: https://api.subdomain.app/mcp

Tools 2 found in our last check

• find_subdomains

  List known subdomains (hostnames) of a root domain. Data is passive (not active scanning): results are historic observations and may include subdomains that no longer resolve or are no longer live. Results are a point-in-time snapshot that changes over time as new subdomains are…

• count_subdomains

  Return only the total number of distinct subdomains known for a domain — no list. Cheap and low-token. Use when the user asks "how many subdomains" or you only need the size of the attack surface. Count includes historic subdomains that may no longer be live. It is a point-in-ti…

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