Performance Tools
CDN Detection
Detect whether a website uses a common CDN provider.
Enter a domain to detect whether it uses a common CDN provider (Cloudflare, CloudFront, Fastly, Akamai, and more).
JustChecker tracks your website's performance signals continuously.
Frequently Asked Questions
It looks for recognizable signatures in HTTP response headers, IP address ranges, and other technical fingerprints that major CDN providers characteristically leave, rather than requiring any special access or configuration on your part.
Some CDN configurations deliberately strip or obscure identifying headers for security-through-obscurity reasons, or use a less common provider whose fingerprint this tool doesn't yet specifically recognize.
A CDN serves content from servers geographically closer to each visitor (reducing latency), absorbs traffic spikes and some attack traffic, and often provides built-in compression, caching, and TLS termination - a broad performance and reliability improvement.
Smaller sites with a geographically concentrated audience benefit less dramatically, but for any site with a global or geographically dispersed audience, a CDN is generally considered a meaningful, low-effort performance improvement.
Yes - a CDN typically means the public-facing IP address resolves to the CDN's edge infrastructure rather than your actual origin server's IP, which is expected and intentional.