Free CDN checker
Find the CDN in front of any website
Enter a domain to see whether Cloudflare, Fastly, Akamai, Amazon CloudFront or another CDN answers for it. We read the response headers, follow the CNAME chain and look up who owns the IP address.
Try: discord.com · www.bbc.co.uk · shopify.com
How it works
How CDN detection works
A content delivery network (CDN) caches a site on servers around the world and answers visitors from the closest one. To do that, the CDN has to sit in the request path: DNS points the domain at the CDN, and the CDN adds its own headers to every response. Both leave signals that anyone can read.
When a CDN proxies the traffic, the origin server stays behind it. The IP address you resolve belongs to the CDN, so a plain IP lookup names Cloudflare or Fastly, not the company that runs the site. A full hosting check reads the platform signals too, and names the host when the site runs on a known platform such as Shopify or Vercel.
- cf-ray
- Cloudflare request ID, sent on every proxied response
- x-amz-cf-id
- Amazon CloudFront request ID
- x-served-by
- Fastly cache node that served the response
- x-akamai-transformed
- Akamai changed the response on the way
- CNAME
- Alias to a CDN host, such as edgekey.net for Akamai
- ASN
- Network that owns the IP address, such as AS13335
FAQ
CDN checker FAQ
Common questions about CDNs and how we detect them.
Related guides
Learn more from the blog
Step-by-step guides on reading and using these results.
How to Find What CDN a Website Uses (5 Methods)
Find what CDN a website uses from its HTTP headers, CNAME records and IP owner. Real output for Cloudflare, CloudFront, Fastly and Akamai sites, plus a header and DNS reference for 10 CDNs.
How to Check If a Domain Uses Cloudflare (4 Methods)
Check if a domain uses Cloudflare in under a minute: look for ns.cloudflare.com nameservers, the cf-ray header or a Cloudflare IP address. Real dig and curl output, plus the setups each check misses.
Related tools
More free tools
Explore our other free lookup and analysis tools.
Free lookup tool
Find the CDN in front of any website
Check if a website uses Cloudflare or another CDN. We read its response headers, CNAME records and IP network, and show the signals behind the answer.