Block IP range not working

I want to block ip range 188.11.0.0/16 (so all ip between 188.114.1.1 and 188.114.255.255).
i created a rule:
IP address is in 188.114.0.0//16
but analyzing netstat output there are always request from that range

How can i block this range?

That means these addresses connect directly to your server and do not go via the proxies, hence any Cloudflare configuration won’t apply either.

You need to make sure that your server only accepts connections from Cloudflare and rejects everything else. That will be something you need to do on your server and you can take the IP addresses from cloudflare.com/ips.

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