How to Detect the Technology Stack of Any Website
Knowing what technologies a website runs on is valuable for competitive analysis, security auditing, and vendor evaluation. From the CMS and JavaScript framework to the hosting provider and email service, most of this information is publicly visible if you know where to look. This guide covers manual and automated approaches to technology detection.
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Step 1: Inspect HTTP Response Headers
HTTP headers reveal a surprising amount. Run a quick check with curl:
curl -I https://example.comLook for headers like Server (e.g., nginx, Apache, cloudflare), X-Powered-By (e.g., Express, PHP, ASP.NET), and X-Generator (e.g., WordPress, Drupal). CDN providers often add their own headers like CF-Ray for Cloudflare or X-Vercel-Id for Vercel.
Step 2: Examine the HTML Source
View the page source and search for telltale patterns. WordPress sites include wp-content in asset paths. Shopify embeds cdn.shopify.com references. React and Next.js leave __next or __NEXT_DATA__ in the DOM. Meta tags like <meta name="generator"> often name the CMS and version directly.
Step 3: Check DNS Records
DNS records reveal hosting and email infrastructure. MX records show the email provider (Google Workspace, Microsoft 365, Zoho). CNAME records may point to a CDN or hosting platform. TXT records contain verification tokens for services like Google, Facebook, and Salesforce. Use the MX Lookup and CNAME Lookup tools to query these records.
Step 4: Analyze JavaScript and Cookie Fingerprints
Open your browser's developer tools and check the Network tab for script URLs. Analytics platforms (Google Analytics, Hotjar, Mixpanel), tag managers, A/B testing tools, and chat widgets all load identifiable scripts. Cookies also carry signatures: _ga for Google Analytics, __cf_bm for Cloudflare, and _shopify_s for Shopify.
Step 5: Check the SSL Certificate
The SSL certificate issuer can hint at the hosting setup. Let's Encrypt certificates are common on self-hosted or small-provider sites. Cloudflare, AWS, and Vercel issue their own certificates. Use the SSL Checker to inspect the certificate chain, issuer, and expiry date.
Frequently Asked Questions
Can I detect what CMS a website is using?
Yes. Most CMS platforms leave identifiable fingerprints in HTML meta tags, HTTP headers, cookie names, and file paths. WordPress, Shopify, Squarespace, and Wix are among the easiest to detect.
Is it legal to scan a website's technology stack?
Yes. Detecting publicly exposed technology information from HTTP headers, HTML source, and DNS records is legal. You are only reading information the server voluntarily sends to every visitor. No authentication or intrusion is involved.
How can I hide my own technology stack from detection?
Remove version numbers from HTTP headers like X-Powered-By and Server. Strip CMS-specific meta tags from your HTML. Use a CDN or reverse proxy to mask your origin server. While complete concealment is difficult, reducing fingerprints significantly raises the bar.