# Subdomain Finder From Certificate Logs

**Use case:** 

Enumerate the subdomains of a domain from public certificate transparency logs. No port scanning and no traffic to the target - the answer comes from certificates that were already published. Give it one or more domains and export the list.

## Input

```json
{
  "domains": [
    "apify.com"
  ],
  "output": "subdomains",
  "filter": "all",
  "includeSummary": true,
  "expiringWithinDays": 30,
  "replaceDefaultKeywords": false,
  "monitorMode": false,
  "monitorName": "default",
  "emitSeenInMonitor": false,
  "fetchFingerprints": false,
  "maxFingerprintsPerDomain": 25,
  "includeSubdomains": true,
  "includeExpired": true,
  "sliceLargeDomains": true,
  "maxQueriesPerDomain": 40,
  "maxMinutesPerDomain": 15,
  "maxRowsPerDomain": 0,
  "compactOutput": false,
  "requestTimeoutSecs": 70
}
```

## Output

```json
{
  "domain": {
    "label": "Domain",
    "format": "string"
  },
  "hostname": {
    "label": "Host name",
    "format": "string"
  },
  "status": {
    "label": "Status",
    "format": "string"
  },
  "days_to_expiry": {
    "label": "Days left",
    "format": "integer"
  },
  "latest_not_after": {
    "label": "Expires",
    "format": "string"
  },
  "first_seen": {
    "label": "First seen",
    "format": "string"
  },
  "last_seen": {
    "label": "Last seen",
    "format": "string"
  },
  "certificate_count": {
    "label": "Certificates",
    "format": "integer"
  },
  "latest_issuer": {
    "label": "Issuer",
    "format": "string"
  },
  "is_wildcard": {
    "label": "Wildcard",
    "format": "boolean"
  },
  "is_suspicious": {
    "label": "Suspicious",
    "format": "boolean"
  },
  "suspicious_keywords": {
    "label": "Keywords",
    "format": "array"
  },
  "change_type": {
    "label": "Change",
    "format": "string"
  },
  "latest_crtsh_url": {
    "label": "crt.sh",
    "format": "string"
  }
}
```

## About this Actor

This example demonstrates how to use [Subdomain Finder, crt.sh Certificate Transparency Logs Search](https://apify.com/snow_leo_data/crtsh-subdomain-finder.md) with a specific input configuration. Visit the [Actor detail page](https://apify.com/snow_leo_data/crtsh-subdomain-finder.md) to learn more, explore other use cases, and run it yourself.


## How to integrate an Actor?

This Task's input is already configured above. Use it as-is rather than inventing a new one.

Do not guess an integration path. Every one of them is in the agent quickstart at https://apify.com/agents.md: the Apify MCP server, Agent Skills with the Apify CLI, the JavaScript and Python clients, the REST API, and the account-free path for an agent with no human to sign in. It also carries the rule on stating cost before the first paid run.

For full API examples (JavaScript, Python, CLI, MCP, OpenAPI), see this Task's Actor page: https://apify.com/snow_leo_data/crtsh-subdomain-finder.md

Each client library has reference documentation the quickstart does not restate: [JavaScript/TypeScript](https://docs.apify.com/api/client/js/docs.md) (`npm install apify-client`) and [Python](https://docs.apify.com/api/client/python/docs.md) (`pip install apify-client`).