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Subdomain API

by subdomain.app in Other

MCP serverPassing, checked 7 h ago

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

https://api.subdomain.app/mcp
Tools
2
open to any client
Uptime
100%
last 30 days
Response time
332 ms
624 ms slowest 5%
Last check
Passed
7 h ago, next any minute now

Scan it nowHow to connect

Reliability

All checks passedSome failedAll failedNot checked

Status and outage history · Atom feed · Watch with other listings

How to connect

Add it to any MCP client that supports remote servers.

{
  "mcpServers": {
    "subdomain-api": {
      "type": "http",
      "url": "https://api.subdomain.app/mcp"
    }
  }
}

2 tools

  • 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…

Security scan

No findings

We scan names, descriptions and tool definitions for hidden instructions and other prompt-injection patterns.

Recent checks

WhenResultHTTPTime
7 h agoPassed200486 ms
17 h agoPassed200250 ms
26 h agoPassed200247 ms
36 h agoPassed200742 ms
44 h agoPassed200428 ms
Show 10 older checks
2 days agoPassed200318 ms
3 days agoPassed200239 ms
3 days agoPassed200226 ms
4 days agoPassed200396 ms
4 days agoPassed200170 ms
4 days agoPassed200338 ms
5 days agoPassed200318 ms
5 days agoPassed200624 ms
6 days agoPassed200425 ms
6 days agoPassed200315 ms