http://www.ralphb.net/IPSubnet/class_a.html That is a page I use whenever I need to do anything with subnets. It explains that the /27 subnet has 30 hosts.
So if you only wanted to block hosts X.Y.Z.23 - X.Y.Z.55 I would do everything under 64.. otherwise you get into defining multiple subnets so you would block X.Y.Z.64/27 ----- Original Message ----- From: "Bill" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Tuesday, March 11, 2003 1:12 PM Subject: Blocking sub-range of IP addresses > 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 ??? > > > -- > To UNSUBSCRIBE, email to [EMAIL PROTECTED] > with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED] > -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
