On Tue, 2010-07-27 at 23:26 +0100, Ralph Corderoy wrote: > Hi David, > > > On 27/07/10 17:18, Ralph Corderoy wrote: > > > I'm unclear what spamhaus mean on that above page when they state > > > "212.227.17.0/32 is listed". /32? > > > > That is odd as a /32 subnet is just the 1 IP, which means 212.227.17.8 > > shouldnt blocked if just 212.227.17.0 is, if it was 212.227.17.0/28 or > > larger subnet then I could understand that 212.227.17.8 would get > > blocked as well due to been within the subnet > > Right, I'm used to /n meaning the network part of the IP address is the > first n out of 32 bits. I haven't seen /32 before but I suppose it's > saying that 212.227.17.0 is a network of exactly one host. /31 would be > a network of two hosts. Except that .0 is the network address and .1 is the broadcast address, leaving no addresses free for 'hosts'.
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