How to whitelist or block IP range

I am trying to whitelist one IP range and block another. Can I do this using the Firewall rules? When I select the IP Source Address dropdown/option and enter: 173.0.80.0/20 I get the following message: CIDR ranges can only be used with ‘in’ operators

Can someone PLEASE provide the exact string that I should use so that it accepted and I can save the range?

Thank you

Take a guess :wink:

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Hidden in plain sight…
Thank you!

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Occasionally it is :slight_smile:

No worries, just note that this will be mostly for blocking, because “Allow” only applies to firewall rules but not other parts of the firewall. For that IP access rules will be better but they only support /16 and /24 CIDRs.

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