RE: [PCTECH] Private IP addresses

[Vern Hamberg <vhamberg@xxxxxxxxxxxxxxxxxxxxxxxxx>]

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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