To expand on Johns suggestion, you might also try visiting www.learntosubnet.com
and/or downloading Chuck Sumeria's White Paper, "Understanding IP Addressing:
Everything You Ever Wanted To Know", at http://www.3com.com/nsc/501302s.html
Tom Lisa, Instructor, CCNA, CCAI
Community College of Southern Nevada
Cisco Regional Networking Academy
John Neiberger wrote:
> > I have a class assigned for example: 198.144.163.1
> > mask 255.255.255.128 how do I subnet that to 2 >networks.
>
> First, let's look at what you have, 198.144.163.1/25.
> That gives you 126 usable addresses, 198.144.163.1-126.
>
> Now, you want to further divide that into two subnets of 62 usable addresses each.
>To do this, simply add another bit to the subnet mask. This will give you the
>following:
>
> 198.144.163.0/26 and 198.144.163.64/26
>
> Your usable address range is 1-62 and 65-126. This is because you can't use the .0,
>.63, .64, and .127 addresses.
>
> There are a LOT of threads in the archives about subnetting. You should read
>through those to get some really good insight into this process.
>
> HTH,
> John
>
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