All servers · Cloud & networking

Subdomain API

app.subdomain/subdomains · v1.0.1

No registry update 90+ days

Measured by MCP Station

Last check	Reachable
Checked at	—
Check success 7 / 30 days	—
First-try success 30 days	—
Median response	—
Lookups 30 days	—
Authentication	No auth
MCP version	2025-06-18
Rank score	—
Declared risk	Read-only (all tools declare readOnlyHint)
Capabilities declared	tools
Tool definitions	2 tools · with description 100% · input schema is an object 100% · read/destructive hints 100%

Find known subdomains of a domain. Passive data; may include historic entries. List or count.

streamable-http · https://api.subdomain.app/mcp

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

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

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 observed — re-query
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-time figure that change

Website · JSON · Text for agents · Registry updated 2026-06-26