What is Check for Cloudflare by Selesti?

Updated

Check for Cloudflare (checkforcloudflare.selesti.com) is a free web tool from Selesti Ltd that tells you whether a domain is using Cloudflare. You enter a domain, it scans from global locations, and it reports on three separate layers: Cloudflare DNS, Cloudflare CDN/Proxy, and Cloudflare SSL. It's useful when you want a quick external view of a site's setup — for example, checking a competitor's stack, verifying your own configuration after a migration, or confirming whether a domain you're investigating sits behind Cloudflare at all.

What the tool actually checks

The scan is not a single yes/no answer. It breaks the result into three independent signals, which matters because a domain can use one without the others.

Signal What it means Possible results shown
Cloudflare DNS Whether the domain's nameservers/DNS entries point to Cloudflare "is using Cloudflare DNS" / "is NOT using Cloudflare DNS" / "could be using a CNAME configuration"
Cloudflare CDN/Proxy Whether traffic is routed through Cloudflare's proxy "is using Cloudflare CDN/Proxy" / "is NOT using Cloudflare CDN/Proxy"
Cloudflare SSL Whether Cloudflare's SSL is in play "is using Cloudflare SSL" / "is NOT using Cloudflare SSL"

The CNAME caveat is worth noting: a domain can be on Cloudflare without using Cloudflare's nameservers, which is why the tool flags that case rather than forcing a yes or no.

How to use it

  1. Open checkforcloudflare.selesti.com.
  2. Enter the domain you want to check.
  3. Start the scan and wait for it to complete.
  4. Read the three results separately — DNS, CDN/Proxy, and SSL — rather than treating them as one verdict.

The scan runs from multiple global locations, so the result reflects what the domain looks like from different points on the network, not just one vantage point.

When it's the right tool — and when it isn't

Good fit:

  • You want a fast, no-setup check on any public domain.
  • You want to see DNS, proxy, and SSL signals broken out separately.
  • You're doing light reconnaissance or verifying your own site after a DNS or hosting change.

Not a good fit:

  • You need to configure Cloudflare — this tool only observes, it doesn't manage anything.
  • You need deep security analysis, performance testing, or traffic inspection.
  • You need a guaranteed authoritative answer: DNS and proxy behavior can vary by location and over time, so treat results as a snapshot.

Practical notes

  • It's a third-party tool, not an official Cloudflare product, despite the name and the ® mark in the heading.
  • Because results depend on live DNS and network state, re-running a scan later can legitimately return a different answer if the domain's configuration changed.
  • The three-layer breakdown is the main reason to use this over a simple "is it Cloudflare?" guess — it tells you how Cloudflare is being used, not just whether the name appears somewhere.