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Re: Discovering network subnets
From: Craig Holmes <leusent () link-net org>
Date: Sun, 21 Aug 2005 02:10:23 -0400

On Saturday 20 August 2005 07:07, hannibal blog wrote:
I'm not sure the network is a C class one, but I'm surprised that such
an ip adress is an host IP.
AFAIK, in the most strict and archaic IP address scheme (depending on the 
first octet) this could NOT be a usable host. This is because in a /24 
x.x.x.0 is considered a wire address and/or broadcast address for the subnet.

In reality today, some administrators use the first and last IP address 
anyway. In rarely breaks any network functionality and it's use is actually 
specified in an RFC #(I don't know off the top of my head). Blame it on the 
(so-called) shortage of IPv4 addresses.

So long story short, just because that IP is in use doesn't mean that subnet 
ISN'T a /24.

Craig
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