How can I find out which CDN a website uses?

Enter the site's URL in the CDN Detector to identify its content delivery network from response headers, IP data, and DNS fingerprints.

How does CDN detection work?

The detector fetches the site's HTTP response headers, resolves its DNS and IP addresses, and matches them against known fingerprints of major CDN providers, such as provider-specific headers, ASNs, and CNAME patterns.

Which CDNs can it detect?

It recognizes major providers including Cloudflare, Akamai, Fastly, Amazon CloudFront, Google Cloud CDN, Azure Front Door, and others with distinctive network fingerprints.

Why does a site show no CDN?

Some sites serve directly from origin servers with no CDN in front, or they strip identifying headers. In those cases the detector reports the hosting evidence it could observe rather than guessing.

TECHNOLOGY DETECTION TOOLS · FREE ONLINE TOOL

CDN Detector

Find out which CDN a website usesThat product page loading in under a second did not get fast by accident. Paste a URL and this checker inspects response headers and delivery fingerprints to name the content delivery network in front of the site.

✓ Free to use✓ No sign-up✓ Ready in your browser

// CDN DETECTOR · GET STARTED

Use CDN Detector

Find out which CDN a website uses

// CDN DETECTOR · AT A GLANCE

CDN Detector: what to know first.

Find out which CDN a website uses

01
A content delivery network sits between visitors and the origin server, speeding up delivery and absorbing traffic spikes. Because CDNs identify themselves in response headers and DNS records, you can usually tell which one a site uses without any special access. This detector fetches the page, collects every response header, follows the DNS CNAME chain, and matches the results against fingerprints for the major CDNs.
02
It is useful for competitive research and performance audits: knowing a competitor uses Cloudflare, Fastly, Akamai or CloudFront tells you something about their infrastructure choices. Each finding comes with the exact evidence, so the result is transparent and verifiable rather than a black-box guess.

// CDN DETECTOR · HOW IT WORKS

How to use the CDN Detector

Enter URL

Enter the website URL (e.g. example.com).

Analyze

Click "Detect CDN" to analyze headers and DNS.

See the CDN

See the detected CDN with the evidence behind each finding.

// CDN DETECTOR · ABOUT THIS TOOL

About the CDN Detector

A content delivery network sits between visitors and the origin server, speeding up delivery and absorbing traffic spikes. Because CDNs identify themselves in response headers and DNS records, this detector can usually tell which one a site uses.

Useful for competitive research and performance audits: each finding comes with the exact evidence, so the result is transparent and verifiable rather than a black-box guess.

Where it helps most

Diagnostics where naming the CDN points at the right fix.

Verify your own CDN

Site owners verify their own CDN is actually active after switching providers, since misconfigured DNS can leave the origin taking all traffic.

Research the fast sites

Developers choosing a CDN look at the fast sites in their niche and check what those sites run for useful market data.

Audit page speed

Performance auditors use it during speed audits to separate origin-server slowness from CDN caching problems, since each points to a different fix.

Diagnose sudden slowness

When a site suddenly loads slowly, checking whether its CDN layer changed is a fast and revealing first diagnostic step.

Reading the evidence

What the headers say, and when they stay silent.

Headers name names

Cloudflare leaves cf-ray headers, CloudFront uses its own domain patterns, and Fastly, Akamai and BunnyCDN each leave their own distinctive markers.

Multi-CDN shows

Multi-CDN setups show mixed fingerprints, for example images from one provider and scripts from another, with each CDN found listed.

Silence is an answer

Headers sometimes stay silent when a site proxies everything through its own stack; the result says so instead of inventing an answer.

CDN Detector: built for trust

Shows the actual header values as evidence, so you judge the result yourself instead of taking a guess on trust.

// CDN DETECTOR · COMMON QUESTIONS

CDN Detector FAQs

How does it tell which CDN a site uses?

By reading response headers and asset URLs. Cloudflare leaves cf-ray headers, Amazon CloudFront uses its own domain patterns, and Fastly, Akamai and BunnyCDN each leave distinctive markers.

Can it detect a site using more than one CDN?

Does a CDN hide the real hosting provider?

Why would my own site show no CDN?

tools-guide

Technology Stack Detector: Reveal Any Website's Tech Stack

Discover the technology stack behind any website in seconds. Our free Technology Stack Detector uncovers CMS, frameworks, hosting, and analytics instantly.

Read article →