How to block IP range?

I keep getting DDOS’d from an iprange. Somehow neither Cloudflare nor my Nginx rules can pick it up.

Regardless, the IPs keep coming in the pattern of:
185.191.171.34
185.191.171.42
185.191.171.37
Etc.

I keep manually blocking them via Firewall → Tools, but obviously this is not a scaleable solution.

How do I block all IPs with 185.191.171.xx

I’ve tried 185.191.171/16 and 185.191.171/24 but it’s not recognized by Cloudflare.

Thanks

Try

185.191.171.0/24
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