# Find the subdomains of a sample domain

**Use case:** 

Finds the subdomains of apify.com in certificate transparency logs (crt.sh) and returns each with its first and last certificate dates, issuers, wildcard flag and current DNS addresses. There is no start fee; you pay per subdomain returned. Swap in your own domains.

## Input

```json
{
  "domains": [
    "apify.com"
  ],
  "includeExpired": true,
  "resolveDns": true,
  "onlyResolving": false,
  "maxSubdomainsPerDomain": 1000
}
```

## Output

```json
{
  "domain": {
    "label": "Domain",
    "format": "text"
  },
  "ok": {
    "label": "Found",
    "format": "boolean"
  },
  "subdomain": {
    "label": "Subdomain",
    "format": "text"
  },
  "resolves": {
    "label": "Resolves",
    "format": "boolean"
  },
  "ipAddresses": {
    "label": "IP addresses",
    "format": "array"
  },
  "hasValidCertificate": {
    "label": "Valid certificate",
    "format": "boolean"
  },
  "firstSeen": {
    "label": "First seen",
    "format": "text"
  },
  "lastSeen": {
    "label": "Last seen",
    "format": "text"
  },
  "lastCertificateExpiry": {
    "label": "Expires",
    "format": "text"
  },
  "logEntries": {
    "label": "Certificates",
    "format": "number"
  },
  "wildcardCertificate": {
    "label": "Wildcard",
    "format": "boolean"
  },
  "issuers": {
    "label": "Issuers",
    "format": "array"
  },
  "error": {
    "label": "Error",
    "format": "text"
  }
}
```

## How it works

### 1. Sign up on Apify or log in

The Subdomain Finder: certificate transparency logs Actor is ready to run with the inputs already set for "Find the subdomains of a sample domain". [Sign up or log in](https://console.apify.com/create-task-from-example/5U4sIRGPDA51WmHZa) and you'll land in Apify Console with a copy of this exact task.

### 2. Start the "Find the subdomains of a sample domain" task

The Subdomain Finder: certificate transparency logs Actor will start running based on the input automatically. You can also change all the input fields, like domains, include names from expired certificates, and more, to match your specific use case.

### 3. Receive the "Find the subdomains of a sample domain" output

Monitor the progress in real time. You will be notified as soon as your dataset is complete and ready for review. Each result includes data such as domain, found, subdomain, and more.

### 4. Integrate into your workflow

The final output is delivered in JSON, CSV, or Excel format, ready to be plugged into your workflow. You can also [run the "Find the subdomains of a sample domain" task via API](https://apify.com/examsens.ai/subdomain-finder.md).

## About this Actor

This example demonstrates how to use [Subdomain Finder: certificate transparency logs](https://apify.com/examsens.ai/subdomain-finder.md) with a specific input configuration. Visit the [Actor detail page](https://apify.com/examsens.ai/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/examsens.ai/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`).