Calculate number of available subnets in given network

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Hi, I have following issue in calculating the number of available subnets (or hosts) in network.
For example the main subnet is /24 (255.255.255.0) which contains two /25 (255.255.255.128) or four /26 (255.255.255.192).

So if the one node is already being used there will be only one /25 or only 3 times /26. Then how should I calculate the number of available subnets. In other words how to get the number and type of remainders. I want to perform this algorithm in PHP.

please click the following link to image.

Kindly ask you to give me any hint.

Posted 15-Jul-14 1:41am

Member 10947632

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Mehdi Gholam · Answer 1 · 2014-07-15T04:26:00

Solution 1

Start here :
http://www.mindwerks.org/Subneting.htm[^]

https://learningnetwork.cisco.com/thread/21527[^]

a working version : http://sourceforge.net/projects/subntcalc/[^]

Posted 15-Jul-14 4:26am

Mehdi Gholam

Updated 15-Jul-14 4:27am

v2

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Member 10947632 15-Jul-14 16:18pm

@MehdiGholam thank you for you links. I checked them, the tutorials that you posted, describing how to calculate the total number of of hosts per subnet and how to split them into small groups.
I know how to calculate subnets, in my case I need to define the number of remaining nodes in a tree after a certain node has been deleted.
For example, the root is based on mask /24(255.255.255.0) which has a two nodes with mask /25(255.255.255.128) and that nodes have smaller nodes with a masks /26 (255.255.255.192) and so on.
When one of the nodes is reoved from a tree then how to calculate the number of remaining nodes?

Please check a following image.

http://screencast.com/t/qisbbKTt1xm[^]