# Tech Stack Detector & Domain Lookup: DNS, WHOIS, Email, SSL (`pewterdesk/bulk-domain-intelligence`) Actor

Bulk tech stack detector and domain lookup: website technologies (135+), email provider, SPF/DMARC grade, SaaS tools verified in DNS, WHOIS/RDAP age and registrar, SSL expiry and social profiles in one row per domain. No API keys. Non-existent domains are free.

- **URL**: https://apify.com/pewterdesk/bulk-domain-intelligence.md
- **Developed by:** [PewterDesk](https://apify.com/pewterdesk) (community)
- **Categories:** Lead generation, Developer tools, SEO tools
- **Stats:** 2 total users, 1 monthly users, 0.0% runs succeeded, 0 bookmarks
- **User rating**: No ratings yet

## Pricing

Pay per usage

This Actor is paid per platform usage. The Actor is free to use, and you only pay for the Apify platform usage, which gets cheaper the higher subscription plan you have.

Learn more: https://docs.apify.com/actors/running/actors-in-store.md#pay-per-usage

## What's an Apify Actor?

An Actor is a serverless cloud program that runs on the Apify platform. It has two run modes.
In Batch mode, an Actor accepts a well-defined JSON input, performs an action which can take anything from a few seconds to a few hours,
and optionally produces a well-defined JSON output, datasets with results, or files in key-value store.
In Standby mode, an Actor provides a web server which can be used as a website, API, or an MCP server.

Apify vocabulary and the platform model are defined once, in the agent quickstart at https://apify.com/agents.md.

## How to integrate an Actor?

If asked about integration, you help developers integrate Actors into their projects.
You adapt to their stack and deliver integrations that are safe, well-documented, and production-ready.

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 examples already wired to this Actor's own input schema, see the [API](#api) section below.

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`).

# README

## Tech Stack Detector & Domain Lookup: DNS, WHOIS, Email, SSL

**Tech stack detector and bulk domain lookup:** find out what technology a website uses, who hosts its email, and its WHOIS, DNS and SSL details, for thousands of domains at once. 

Paste in a list of domains, website URLs or work emails. For each company you get back **one clean JSON row** with its:

- **Website tech stack.** 135+ technologies: CMS, e-commerce platform, framework, hosting/CDN, analytics, ad pixels, CRM and marketing automation, live chat, payments, cookie consent and more.
- **Email provider.** Google Workspace, Microsoft 365, Zoho, Proofpoint, Mimecast and others, detected from the MX records.
- **Email sending tools** found in SPF: SendGrid, Mailchimp, HubSpot, Salesforce, Amazon SES, Zendesk, Klaviyo and more.
- **Email security grade (A–F)** based on SPF and DMARC policy. It's a good opener for security and deliverability outreach.
- **SaaS tools the company has verified in DNS**, such as Atlassian, Slack, OpenAI, Anthropic, DocuSign, Stripe, Okta, Notion, Zoom and more. Most other tools miss this buying signal.
- **Domain registration** from the official RDAP registry: registrar, creation and expiry dates, and **domain age in days**.
- **SSL certificate**: issuer, validity dates, **days until expiry**, and TLS protocol.
- **DNS provider** (Cloudflare, Route 53, GoDaddy, etc.) plus the raw A/AAAA/MX/NS/TXT/CAA records.
- **Company social profiles** linked from the homepage: LinkedIn company page, X, Facebook, Instagram, YouTube, GitHub, TikTok, Crunchbase and Discord.
- **Site basics**: title, meta description, language, redirects, HTTPS, security headers, robots.txt, sitemaps, and whether the site publishes an **`llms.txt`** for AI crawlers.

No API keys and no login. It's fast, at roughly 1–3 seconds per domain with up to 50 in parallel. **Domains that don't exist and invalid entries are free.**

### Who uses this

- **Sales and lead-gen teams.** Qualify and segment account lists by technology ("everyone on Shopify + Klaviyo", "companies on Microsoft 365 without DMARC"), then enrich a CRM export.
- **Agencies.** Find prospects on outdated stacks or with weak email security, expiring SSL, or no analytics.
- **Security and deliverability consultants.** Bulk SPF/DMARC audits of customer or prospect domains.
- **Investors and market researchers.** Measure technology adoption across a list of companies, and check domain age as a maturity signal.
- **AI agents and automations.** Call it from n8n, Make, Zapier or Apify MCP to answer "what does this company use?" in one call.

### Input

```json
{
  "domains": ["stripe.com", "https://www.notion.so/pricing", "jane@apify.com"],
  "includeWebsite": true,
  "includeRegistration": true,
  "includeTls": true,
  "respectRobotsTxt": true,
  "maxConcurrency": 10
}
```

The tool accepts bare domains, full URLs and email addresses, normalizes them to the domain, and removes duplicates. Turn off `includeWebsite` for a pure DNS, email and registration run.

### Output (shortened example)

```json
{
  "domain": "apify.com",
  "exists": true,
  "dnsProvider": "Amazon Route 53",
  "email": {
    "acceptsEmail": true,
    "mailboxProvider": "Google Workspace",
    "spf": { "present": true, "allPolicy": "softfail", "senders": ["Amazon SES", "Google Workspace", "HubSpot", "Mailgun"] },
    "dmarc": { "present": true, "policy": "reject", "pct": 100, "rua": true },
    "securityGrade": "A"
  },
  "verifiedServices": ["Google Search Console / Workspace", "OpenAI"],
  "registration": { "registrar": "Amazon Registrar, Inc.", "createdAt": "2009-…", "expiresAt": "…", "domainAgeDays": 6340 },
  "tls": { "issuer": "Amazon", "daysUntilExpiry": 97, "protocol": "TLSv1.3" },
  "website": {
    "finalUrl": "https://apify.com/",
    "title": "Apify: Marketplace of ready-to-run tools for AI",
    "technologies": [
      { "name": "Next.js", "category": "JavaScript framework", "evidence": "html" },
      { "name": "HubSpot", "category": "Marketing automation", "evidence": "html" },
      { "name": "Intercom", "category": "Live chat", "evidence": "html" }
    ],
    "socialProfiles": { "linkedin": "https://www.linkedin.com/company/apify", "github": "https://github.com/apify" },
    "llmsTxt": true
  }
}
```

The **Overview** table view in the dataset tab flattens the key columns for CSV and Excel export.

### Pricing

Pay per result. You are charged only for **domains that exist**:

| Event | Price |
|---|---|
| Domain analyzed (full profile) | **$0.004** (that's $4 per 1,000 domains) |

Non-existent domains, invalid input lines and duplicates cost nothing. Use the maximum-cost-per-run setting to cap your spend, and the run stops cleanly when it reaches the cap.

### How it works and data sources

- **DNS**: standard public DNS queries. If the system resolver looks unreliable, the tool automatically falls back to DNS-over-HTTPS (Cloudflare, then Google).
- **Registration**: the official **RDAP** protocol, the ICANN-mandated successor to WHOIS, using IANA's bootstrap registry. Some country TLDs (for example `.so`) don't offer RDAP and return `null`.
- **TLS**: a single TLS handshake to port 443.
- **Website**: `robots.txt`, then the homepage, then `/llms.txt`. That's three light requests per domain, with a clearly identified user agent. **The tool respects robots.txt by default.** It doesn't crawl, doesn't log in, and doesn't collect personal data.
- **Fingerprints** are an original, curated signature set covering headers, cookies, script URLs, HTML markers and generator tags.

### FAQ

**Is this legal?** The tool reads only public DNS, public registry (RDAP) data and a site's public homepage, the same information any browser or mail server sees. It honors robots.txt and doesn't collect personal data. As always, use the results in line with your local laws, such as GDPR rules for outreach.

**Why is a technology missing?** Some sites load scripts only after cookie consent or user interaction, so a single-page fetch can't see them. DNS-based signals (email provider, SPF senders, verified SaaS) don't have that limitation.

**Do you return contact emails or people?** No. This tool is company-level only.

**Feature requests and bugs:** please open an issue in the **Issues** tab. We monitor issues and ship fixes quickly.

***

Built by **PewterDesk** ([pewterdesk.pages.dev](https://pewterdesk.pages.dev)). More tools: [apify.com/pewterdesk](https://apify.com/pewterdesk).

# Actor input Schema

## `domains` (type: `array`):

One per line. Accepts bare domains (stripe.com), URLs (https://www.notion.so/pricing) or work emails (jane@acme.com → acme.com). Duplicates and invalid entries are skipped and never charged.

## `includeWebsite` (type: `boolean`):

Fetches robots.txt, the homepage and /llms.txt (3 light requests per domain). Turn off for a DNS-only run.

## `includeRegistration` (type: `boolean`):

Registrar, creation/expiry dates and domain age from the official RDAP registry service.

## `includeTls` (type: `boolean`):

Certificate issuer, validity window, days until expiry, protocol.

## `respectRobotsTxt` (type: `boolean`):

If the site's robots.txt disallows the homepage, skip the website step (DNS, email and RDAP data are still returned).

## `maxConcurrency` (type: `integer`):

Domains analyzed in parallel.

## `maxDomains` (type: `integer`):

Optional cap on how many domains from the list to process.

## `dnsMode` (type: `string`):

auto = system DNS, switching to DNS-over-HTTPS (Cloudflare, Google fallback) if system DNS looks unreliable. Usually leave on auto.

## Actor input object example

```json
{
  "domains": [
    "stripe.com",
    "notion.so",
    "apify.com"
  ],
  "includeWebsite": true,
  "includeRegistration": true,
  "includeTls": true,
  "respectRobotsTxt": true,
  "maxConcurrency": 10,
  "dnsMode": "auto"
}
```

# Actor output Schema

## `results` (type: `string`):

One company profile per domain: tech stack, email provider, SPF/DMARC, RDAP, SSL (default dataset).

# API

You can run this Actor programmatically using our API. Below are code examples in JavaScript, Python, and CLI, as well as the OpenAPI specification and MCP server setup.

## JavaScript example

```javascript
import { ApifyClient } from 'apify-client';

// Initialize the ApifyClient with your Apify API token
// Replace the '<YOUR_API_TOKEN>' with your token
const client = new ApifyClient({
    token: '<YOUR_API_TOKEN>',
});

// Prepare Actor input
const input = {
    "domains": [
        "stripe.com",
        "notion.so",
        "apify.com"
    ]
};

// Run the Actor and wait for it to finish
const run = await client.actor("pewterdesk/bulk-domain-intelligence").call(input);

// Fetch and print Actor results from the run's dataset (if any)
console.log('Results from dataset');
console.log(`💾 Check your data here: https://console.apify.com/storage/datasets/${run.defaultDatasetId}`);
const { items } = await client.dataset(run.defaultDatasetId).listItems();
items.forEach((item) => {
    console.dir(item);
});

// 📚 Want to learn more 📖? Go to → https://docs.apify.com/api/client/js/docs

```

## Python example

```python
from apify_client import ApifyClient

# Initialize the ApifyClient with your Apify API token
# Replace '<YOUR_API_TOKEN>' with your token.
client = ApifyClient("<YOUR_API_TOKEN>")

# Prepare the Actor input
run_input = { "domains": [
        "stripe.com",
        "notion.so",
        "apify.com",
    ] }

# Run the Actor and wait for it to finish
run = client.actor("pewterdesk/bulk-domain-intelligence").call(run_input=run_input)

# Fetch and print Actor results from the run's dataset (if there are any)
print(f"💾 Check your data here: https://console.apify.com/storage/datasets/{run.default_dataset_id}")
for item in client.dataset(run.default_dataset_id).iterate_items():
    print(item)

# 📚 Want to learn more 📖? Go to → https://docs.apify.com/api/client/python/docs/quick-start

```

## CLI example

```bash
echo '{
  "domains": [
    "stripe.com",
    "notion.so",
    "apify.com"
  ]
}' |
apify call pewterdesk/bulk-domain-intelligence --silent --output-dataset

```

## MCP server setup

```json
{
    "mcpServers": {
        "apify": {
            "type": "http",
            "url": "https://mcp.apify.com/?tools=fetch-actor-details,pewterdesk/bulk-domain-intelligence"
        }
    }
}
```

The hosted server signs you in with OAuth on first connect, so no API token belongs in this config. Clients without OAuth support can send an `Authorization: Bearer <APIFY_API_TOKEN>` header instead, using a token from API & Integrations in Apify Console (https://console.apify.com/settings/integrations).

## OpenAPI specification

Download the OpenAPI definition: https://api.apify.com/v2/actors/hRUP64uzrItekSq6P/builds/h3IsAeBOg556Pje9M/openapi.json