Who made Check for Cloudflare and why?

Updated

Check for Cloudflare is a free web tool made by Selesti Ltd, a UK digital agency. Its purpose is narrow and practical: enter any domain and quickly see whether that site is using Cloudflare — specifically Cloudflare DNS, the Cloudflare CDN/proxy, and Cloudflare SSL. The tool is described as a "quick and easy" checking project, and nothing in its interface suggests you need an account, an API key, or any setup to use it.

What the tool actually checks

The scan reports three separate layers, and it's worth understanding that they are independent — a site can use one without the others:

Layer What a positive result means
Cloudflare DNS The domain's nameservers or DNS entries point to Cloudflare
Cloudflare CDN/Proxy Traffic is routed through Cloudflare's proxy (the orange-cloud setup)
Cloudflare SSL Cloudflare is issuing or terminating the TLS certificate

A domain can show Cloudflare DNS without the CDN/proxy being active, and the tool explicitly notes that a negative CDN result "could be using a CNAME configuration" — meaning a CNAME-based setup may not register the same way a full nameserver delegation does.

Why Selesti built it

The stated purpose is detection on any domain, not just your own. That makes it useful for:

  • Checking your own site after a DNS or hosting migration, to confirm Cloudflare is actually active.
  • Checking a third-party site out of curiosity or for competitive/technical research.
  • Verifying a partial setup — for example, confirming DNS is on Cloudflare while the proxy is still bypassed.

Because it runs from global locations, results can differ depending on where the check originates — DNS propagation and anycast routing mean a change you just made may appear in some regions before others.

How to use it

  1. Open the tool at checkforcloudflare.selesti.com.
  2. Enter the domain you want to check.
  3. Run the scan and read the three results — DNS, CDN/Proxy, and SSL — separately rather than as a single yes/no.
  4. If a result looks wrong right after a change, wait and re-check; propagation is the most common cause of a mismatch.

What it is not

It's a diagnostic checker, not a security scanner or a Cloudflare account tool. It won't tell you your Cloudflare plan, your firewall rules, or whether your configuration is correct — only whether Cloudflare is detectable at each of the three layers. For anything beyond that, you'd need access to the Cloudflare dashboard itself.