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 ???