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Find available IP addresses given a subnet mask?

Can someone help me learn what I formulas/conversion to figure out, if given the subnetmask of 255.255.255.224, what IP address would be available and on the same subnet?

This is an example question and I have been given the following 4 answers to choose 2 from:

10.4.4.125
10.4.4.158
10.4.4.165
10.4.4.189
10.4.4.199

It's a practice not a homework assignment or a test heh :)

Thanks

Chris Millard

There is an online subnet calculator that you can use at http://www.subnet-calculator.com

Garry Shape

ASKER

Thanks do you know one where it could show me how to break down the logical process instead of just giving answer?

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Pete Long

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hypercube

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Garry Shape

ASKER

Thanks for the advice here, it really helps.

And this practice question actually popped up for a Comptia Security + one, which I found interesting.
It seems every IT exam these days that has to do with Windows is including Subnetting questions. I failed the MCSA Server 2012 because half the questions were on subnetting and IPv6 which 2 months of reading a study book (that had great reviews) provided me no information on.
So then I try to go back to something more basic like Security+ and it appears there's going to be subnetting here as well. Not sure on IPv6 stuff though (yet).