Enter a site address to see whether it sits behind Cloudflare or another CDN. Free, instant, no signup.
A free checker for whether a website uses Cloudflare. Enter a URL and it reads the response headers for Cloudflare's own markers, such as cf-ray, and for other CDN and hosting platforms including CloudFront, Fastly, Akamai, Vercel and Netlify. No signup, no email.
CDNs add headers to the responses they serve. Cloudflare adds cf-ray on proxied traffic, CloudFront adds x-amz-cf-id, and Vercel adds x-vercel-id. The tool uses only headers that a single provider sets, and shows the exact header so you can check it.
To see all response headers for a page, use the HTTP Header Checker.
Enter its address above. The tool requests the page and looks for Cloudflare's headers, such as cf-ray and server: cloudflare, and shows the one it found.
Yes. If Cloudflare handles only DNS and does not proxy traffic, or the site strips these headers, nothing identifies it. The tool reports not detected in that case.
A CDN serves copies of your pages from servers near the visitor, which lowers load time. Faster pages help Core Web Vitals, and a CDN can also absorb traffic spikes and some attacks.
