I just want to understand how this software works: http://www.subnet-calculator.com/
I just want to understand how this software works: http://www.subnet-calculator.com/
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I just want to understand how this software works: http://www.subnet-calculator.com/
It’s not really calculating the address mask from the address. Rather it’s calculating the network mask, address, number of sub-nets and size of each subnet from the class of network you supply (A, B or C). Most of this is defined in RFC 1918 (see §3 in particular).
Edit: I should probably add that class A, B, and C have been obsolete since CIDR (Classless InterDomain Routing) was introduced in 1993. The current definition is in RFC 4632, in case you happen to really care (but for the most part, you probably don’t).