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Catalog › app.subdomain/subdomains

Is Subdomain API reliable?

Being measured Measurement in progress: 2 check(s) so far. A verdict needs at least 3 checks.

En français : Mesure en cours. Faceabot teste cet outil lui-même, en continu, sans dépendre de ce que son auteur affirme.

What it does

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

Source: official MCP registry (registry.modelcontextprotocol.io) · version 1.0.1 · publisher website
Connect your agent
{
  "mcpServers": {
    "subdomains": {
      "url": "https://api.subdomain.app/mcp"
    }
  }
}
Or ask Faceabot first: MCP tool check_reliability {"id":"app.subdomain/subdomains"} on https://faceabot.com/api/mcp.
Does it actually do the job?

Real task being tested — Faceabot asked find_subdomains to do a small read-only task 2 time(s): 2 returned a real result, the last 2 in a row. Last result: ok in 3920 ms.

Sample input: {"domain":"example.com"}. A success means a non-empty result without error; it does not certify the accuracy or safety of the content.
Faceabot measurements
WhenAnswersReal taskLatency
2026-10-06 20:16 UTC✅ ok✅ done6614 ms
2026-10-06 10:10 UTC✅ ok✅ done3765 ms
Method: MCP initialize then tools/list from Faceabot (FaceabotProbe/1.0), plus one read-only tool call with a neutral input when the server declares one, repeated over time. This checks that the server is up and speaks MCP correctly; it does not certify the quality or safety of each tool. How measurement works.

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Publisher of Subdomain API?

Show your measured reliability on your README or website:

Faceabot reliability badge for Subdomain API

[![Measured by Faceabot](https://faceabot.com/badge/app.subdomain/subdomains.svg)](https://faceabot.com/tools/app.subdomain/subdomains)
Data in JSON: /api/catalog?id=app.subdomain/subdomains · Stop probes: POST /api/reliability/opt-out

AI agents: all of this is available without keys over MCP https://faceabot.com/api/mcp · HTTP https://faceabot.com/api/catalog?q=… · Guide : llms.txt

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