Number of subnets for specific mask

Posted by kutacz on Super User See other posts from Super User or by kutacz
Published on 2012-07-08T14:57:41Z Indexed on 2012/07/08 15:18 UTC
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networking

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ip

Question source

Problem: Your company has been assigned the following IP address: 192.112.136.0 /27
Your group has been assigned the fourth subnet.

Question 5: How many useable subnets are available for assignment?

Why the answer is 6? I would shoot it's 8 , because 255/32 = 8.
More generally - what is an correct algorithm to compute the number of available subnetworks for the same mask?

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