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Another distinction is the subnet mask:

Class A --- 255.0.0.0
Class B --- 255.255.0.0
Class C --- 255.255.255.0

And the leftmost numbers are set to specific ranges for each class --

Class A --- 1-127 (127 never used, except loopback at 127.0.0.1)
Class B --- 128-191
Class C --- 192.223

Interesting "bit" I just found is that the leftmost numbers are actually defined by their leftmost (high-order) bits

Class A --- 0
Class B --- 10
Class C --- 110

So the first high-order bit that is OFF defines the class---bit 1 is A, bit 2 is B, bit 3 is C. Cool!!!

Found this at <http://www.cramsession.com/articles/files/ip-address-classes-9162003-1514.asp>, just another of tons of IP traingin stuff on the net. Used google on "class a IP address" to find it.

Vern

At 09:02 AM 9/21/2004, you wrote:
I think it works like this (I am no expert!)

Class A has fewer networks (126) and more hosts (16,777,214) available
Class B has more networks (16,384) but fewer hosts (65,534) than a Class A
Class C has the most networks (2,097,152) but fewer hosts (254) than Class B

Check out http://www.learntosubnet.com/
Then go to the IP Addressing Section Helper

-Bryon



-----Original Message-----
From: pctech-bounces@xxxxxxxxxxxx [mailto:pctech-bounces@xxxxxxxxxxxx] On
Behalf Of Dan Bale
Sent: Tuesday, September 21, 2004 9:50 AM
To: pctech@xxxxxxxxxxxx
Subject: [PCTECH] Private IP addresses

On AS400pro.com, I found the following reference:

Private IP addresses
10.x.x.x  Full Class A
172.16.x.x - 172.31.x.x  Multiple Class B addresses
192.168.x.x  Multiple Class C addresses

Can someone point me to an "easy" reference to the meanings of the
"classes", or describe them here?  I have some familiarity with the last one
as my PC at home uses a "C" address sitting behind a router/firewall, which
itself uses the IP address assigned by the ISP.  My PC at work is assigned a
class "B" address.

But what are the differences between them?

tia,
db

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