Re: Blocking sub-range of IP addresses
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" <bill07@shaw.ca>
To: <debian-security@lists.debian.org>
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 ???
>
>
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