How to know if cloudflare is conneted?

How to know whether a certain website is using Cloudflare or not?

See if the domain/hostname uses nameservers ending ns.cloudflare.com, resolves to a Cloudflare IP address or returns “server: cloudflare” in the headers.
/shameless self-promotion, put the domain in here… cf.sjr.org.uk :: Cloudflare Things

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I don’t understand where to check nameservers. Could you please check this site and tell me if it is registered in Cloudflare? Thanks in Advance

https://poslinksolution.com/

You could also just press F12 in your Browser to open the Dev Tools and then have a look at this menu. This is not a 100% guarantee, as people could theoretically put fake Cloudflare headers on their site, but it’s probably good enough if you just want to know if a random site is using Cloudflare or not.

If it says server: Cloudflare and contains Cf-Cache-Status and Cf-Ray, the site is probably using Cloudflare.

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Thanks, it helped a lot. I got it now.

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