Speed · SSL · SEO · Security · Performance
DNS & CDN
This check lists nameservers, CNAME targets and cache headers. Cloudflare and other CDNs often show up as NS, CNAME or headers such as cf-ray.
Frequently asked questions
- Does Cloudflare always mean a CDN?
- Cloudflare can be DNS-only (grey cloud) or proxy (orange cloud). A cf-ray header means the HTTP hop went through their proxy.
- What is a good Cache-Control?
- HTML is often private or short-lived. Static files should have a long max-age plus a fingerprint in the URL.