http://www.subnet-calculator.com/cidr.php

Online CIDR Calculator, even gives the range that it covers so you can 
play with it, see which one gives you the results you need.

Thanks,
Michael

Brian K. Andersen wrote:
> Hi,
>
> If I want to block this ip range: 195.229.240.0 - 195.229.255.255 How do
> I do that, in one single rule?
>
> Best regards,
> Brian
>
>
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