Monday, August 29, 2011

Subnetting Made Easy - Formula

I covered subnetting in my earlier posts, Subnetting Made Easy, Part 1 and Subnetting Made Easy, Part 2.

In the latter mentioned post, I explained how you can use simple additions or subtractions to work out the First Usable Address, the Last Usable Address and the Broadcast Address of a subnet.

As the post was quite long, I thought I should re post the formulas in case they got lost in the sea of text.

Here they are:

First Address = Network Address + 1
Broadcast Address = Next Network Address - 1
Last Address = Broadcast Address - 1 

If they make no sense to you, please re-read my previous post.

As always, if you have any questions or have a topic that you would like me to discuss, please feel free to post a comment at the bottom of this blog entry, e-mail at, or drop me a message on Twitter (@OzNetNerd).

Note: This website is my personal blog. The opinions expressed in this blog are my own and not those of my employer.

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