Hello Debian,

I want to block all ip's ending in 224 to 255 but not 220 and others
searching the net I found I need to add "/27" to end of the ip.
I understand /8 /16 /24 /32 somewhat but...

My question:  what makes /27 significant 
X.Y.Z.224 - X.Y.Z.255
deny from 63.148.99.224/27

Thanks
P.s. for example, how would I block only X.Y.Z.23 - X.Y.Z.55 ???


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