Subdomain API

app.subdomain/subdomains · v1.0.1 · other

Subdomain API is healthy: it completed an MCP handshake in 3489 ms and exposes 2 tools. It scores 55/100.

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

Endpoint: https://api.subdomain.app/mcp (streamable-http)

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Score 55/100

health17 / 25
authEase15 / 15
toolQuality15 / 15
maintenance3 / 15
adoption0 / 10
usage0 / 10
security5 / 10

Scoring v0.3, computed 2026-10-15T08:34:18.291Z.

Health history

Checked (UTC)StatusLatencyError
2026-10-14T16:50:46.868ZHealthy3489

Tools (2)

find_subdomainsList 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_subdomainsReturn 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