reserved ip ranges

Darrell Shandrow nu7i at
Sun Nov 9 14:00:56 EST 2003

Hi Gregory,

The IP address classifications are growing more and more obsolete as we're
pretty much exclusively on classless IP routing now.  Still, the classes
indicate the subnet mask, which indicates how much of an IP address is used
for the network and how much is used for the hosts.  If you need a *huge*
number of addresses, then use the class A network.  If you need a
fairly large amount of space, use the - class B
networks.  If you need a reasonable amount of addresses, use the class C
networks at  You really may use any of the three ranges; you
may use the subnet mask to shrink the address space to your needs.  For
example, a very common network is one with a gateway at and a
subnet mask of  This is the class A private address range
subnetted as though it were a class C.  Private IP address ranges are
defined in RFC 1918.

Darrell Shandrow - Shandrow Communications!
Technology consultant/instructor, network/systems administrator!
A+, CCNA, Network+!
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All the best to coalition forces carrying out Operation Iraqi Freedom!
----- Original Message ----- 
From: "Gregory Nowak" <greg at>
To: <speakup at>
Sent: Sunday, November 09, 2003 11:12 AM
Subject: reserved ip ranges

> Hi all.
> I know that -, -,
> and - are reserved for class a, b, and c
> networks respectively. However, I was wondering why there are 3
> different classes of networks (and reserved ip ranges), and how one
> decides which class to use?
> Thanks.
> Greg
> -- 
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