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Determining Number of Subnets and Hosts

...the magic formula for determining how many subnets and hosts you can have is 2^n -2. N equals the number of available bits, and the two subtracted IPs are for the broadcast and network IPs.

 

This image is a screenshot from a training video. It probably looks like a bunch of noise, but it actually really helped me understand subnetting!

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Uploaded on December 6, 2010