I think the formulas are not being applied correctly:
There will be to 2 kind of requests to make subnetting:
- We need X number of hosts per subnet (in few words, the priority are the hosts not the subnets)
- We need X number of subnets (in few words, the priority are the subnets only)
Formulas
If you want to make subnetting per "X" amount of host you need to use:
(2^n) - 2 >= required hosts
If you want to make subnetting per "X" amount of subnets:
(2^n) >= required subnets
The block of the new networks:
256 - modified octets (basically using the new subnet mask)
To see how many available bits there are to subnetting
32 - CIDR (Example: 32 - 25)
Where 'n' will represent the number of bits subtracted from the available bits.
n used for (2^n) - 2 >= required hosts will be seen as zeros (0's) the remaining will be seen as 1's and sum to the old subnet mask in order to create the new subnet mask.
n used for (2^n) >= required networks will be seen as one's (1's) and sum to the old subnet mask in order to create the new subnet mask.
Hope it is useful.
:-)
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