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Posted by Ira Gladnick on June 1, 2008, 11:43 pm
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Would anyone happen to have a pointer to a proof of how the "magic
number" algorithm for finding a subnet number's "interesting" octet
decimal value works? I.e., WHY does it work, mathematically speaking?
Algorithm is: subtract the mask's "interesting" (non-255) decimal
number from 256, which yields the "magic number". Then find the
largest multiple of the "magic number" that is less than the
"interesting" decimal value in question--this is the "interesting"
decimal number for the subnet address.
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