How to Tell if a Website Uses Cloudflare CDN
Identifying whether a website was built with Cloudflare CDN used to require technical expertise — inspecting source code, tracing network requests in DevTools, and knowing which patterns to look for. Our free scanner automates all of that: it fetches the page, analyzes 2 Cloudflare CDN-specific signals, and returns a verdict with a confidence score.
You might want to detect Cloudflare CDN for competitive research, due diligence before acquiring a site, or simple curiosity. Whatever the reason, this page covers every method — automated and manual.
What is Cloudflare CDN?
Cloudflare CDN is a cdn used to build websites and web applications.
It is primarily used for business websites, portfolios, landing pages, and personal sites without coding knowledge.
Visit Cloudflare CDN official websiteSigns a Website Is Built With Cloudflare CDN
Our detection engine checks 2 unique Cloudflare CDN fingerprints. Here are the most reliable signals:
HTTP Response Headers
Cloudflare CDN-hosted sites respond with specific HTTP headers that identify the platform or infrastructure. These are visible in DevTools → Network tab.
cf-rayserverHow to Manually Detect Cloudflare CDN Websites
Method 1 — View Page Source
- Open the website in your browser
- Press
Ctrl+U(Windows) orCmd+Option+U(Mac) - Search (
Ctrl+F) forcloudflare-cdnorcloudflarecdn - If found in script src, class names, or meta tags — it's likely Cloudflare CDN
Method 2 — Browser DevTools Network Tab
- Press
F12to open DevTools - Click the Network tab and reload the page
- Filter by
cloudflarein the search box - If you see requests to Cloudflare CDN-specific domains, it's confirmed
How Our Cloudflare CDN Detector Works
When you submit a URL, our engine fetches the page from its server — just like a browser would — then analyzes the response across 2 Cloudflare CDN-specific fingerprints:
Script analysis
We scan all loaded JavaScript files for known CDN paths and runtime names
CDN domain matching
We cross-reference every asset request against known platform CDNs
HTML pattern scanning
We search the DOM for platform-specific class names and data attributes
Header inspection
We read HTTP response headers that identify the server or platform
Meta tag extraction
We check generator and other meta tags in the document head
Confidence scoring
We weight each matched signal and normalize to a 0–99% score
How to Build a Similar Website With Cloudflare CDN
Sign up at https://www.cloudflare.com/cdn, pick a template, customize it with the drag-and-drop editor, add your content, and publish. Most website builders offer free plans to get started.
Other popular website builders include Wix, Squarespace, Webflow, Carrd, and Showit.
Get started with Cloudflare CDNFrequently Asked Questions
How can I tell if a website was built with Cloudflare CDN?
The most reliable ways to detect Cloudflare CDN are: (1) open DevTools → Network tab and look for requests to Cloudflare CDN-specific CDN domains, (2) view page source and search for Cloudflare CDN-specific class names or data attributes, (3) use our free scanner — we check 2 detection signals automatically and return a confidence score.
Is your Cloudflare CDN detector free?
Yes, completely free. Paste any URL into our scanner and we'll analyze it for Cloudflare CDN fingerprints immediately. No account required, no limits on scans.
How accurate is the Cloudflare CDN detection?
We check 2 unique Cloudflare CDN fingerprint signals across HTML, JavaScript, CDN domains, meta tags, and HTTP headers. Our confidence score reflects how many signals matched — a score above 70% is a strong indicator. We cap accuracy at 99% to reflect that all fingerprint-based detection is probabilistic.
Can Cloudflare CDN sites be detected if they use a custom domain?
Yes. Custom domains don't hide the underlying platform. The JavaScript files, CDN requests, HTML attributes, and server headers all remain identifiable regardless of the domain name used. Our scanner fetches the page directly and analyzes its technical composition.
What should I do after detecting a Cloudflare CDN website?
If you want to build something similar, visit https://www.cloudflare.com/cdn to learn more or sign up. If you're doing competitive research, our scan result also shows the full technology stack — including hosting platform, domain age, and other detected technologies. You can share the result link with your team.