Official Lammle User Forum
I know the fever and confusion that is always hitting us new subnetting starters. I have seen where you query is, but this is what I can offer,
PRACTICE EXAMPLE 7B
255.255.255.192 (/26) 172.16.0.0
By default a class B subnet Mask is 255.255.0.0 which is 16 bits (255.255)for the network and 16 bits (0.0) for the Hosts. The /26 means that more bits have been borrowed from the host bits
Host: 00000000 . 00000000 this means 16 bits by default plus (+) 10 bit Red will give a total of /26 bits. 26 - 16 (default) = 10 and count 10 zeros from left to right.
And the formula to find the number of networks/subnets is 2^10 (the red 0's) = 1024
The Host will be 2^6-2 (the six remaining 0') = 64-2=62
And the Increment/block size is 64. Why? This is the smallest number on the borrowed bits of the forth Octet.
128 64 32 16 8 4 2 1
0 0 0 0 0 0 0 0
Or as Lammle shows us is 256-192=64
But being a beginner 'am still finding problems with Class B and A.
Hope when you get better you will help me.
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