Performance

CDN Checker

Enter any URL and we'll sniff its response headers to identify which CDN (Cloudflare, Fastly, CloudFront, Akamai, Vercel, Netlify, BunnyCDN, Azure, and more) is in front of the origin.

What is a CDN checker?

A CDN checkerinspects a site's response headers to detect which Content Delivery Network serves it. Use it to check if a website uses a CDN — Cloudflare, Fastly, CloudFront, Akamai, Vercel and more — instantly and free.

Cloudflare & other CDN detection

Run a cloud flare check or detect any provider: this website cdn checker reads signals like server, cf-ray, via and x-cache to identify the CDN. It works as a cloudflare cdn checker and a general cdn check online.

Why use a CDN?

A CDN serves your site from servers near each visitor, cutting latency, absorbing traffic spikes, and adding security. Faster global delivery helps Core Web Vitals and SEO — so it pays to check cdn performance and confirm yours is active.

How to use the CDN checker

  1. Paste a URL into the CDN checker above.
  2. Click “Check” — we read the response headers.
  3. See the detected CDN (or none).

More performance tools

Pair this with our HTTP Headers Checker, GZIP Compression Test, Page Speed Test and the full free SEO tools suite.

Frequently asked questions

A CDN checker inspects a website's response headers and DNS to detect which Content Delivery Network is serving it — Cloudflare, Fastly, CloudFront, Akamai, Vercel, Netlify, BunnyCDN, Azure and more. It's the quickest way to check if a website uses a CDN.
Paste the URL into the CDN checker above. We read the response headers (like server, cf-ray, via, x-cache) and report the detected CDN — so a Cloudflare check, or any other CDN, takes one click.
A CDN caches and serves your site from servers close to each visitor, reducing latency and load on your origin. CDNs speed up global load times, absorb traffic spikes, and add security (DDoS protection, WAF) — all of which help performance and SEO.
It detects the CDN in front of your origin from the response signals. For deeper performance checks, pair it with our HTTP Headers Checker (caching headers) and Page Speed Test to confirm assets are actually cached and fast.
Completely free and online, with no account required. It's part of WebsiteAuditTools' free suite of performance tools.