A good site to learn subnetting is www.learntosubnet.com
The quick answer to your math question is:
Calculate Subnets
2^N, where N = Number of borrowed bits for subnetting*
Calculate Host Addresses
2^H - 2, where H = Number of host bits remaining
HTH,
Tom Lisa, Instructor, CCNA, CCAI
Community College of Southern Nevada
Cisco Regional Networking Academy
Studying_to_BE_CCIE wrote:
> Does anyone have a good site, or can show me the math, to quickly figure
> out subnetting and determining a address when asked for X amount of
> host.
>
> A person had showed me the math using 256 base and subtracting bits or
> mask or something. I did not take notes and can't remember the math.
>
> As you can tell I am not a mathematician.
>
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