Hello I'm planning to create a java application which calculates ip address just like this http://jodies.de/ipcalc?host=172.168.0.2&mask1=23&mask2=

can you suggest an existing library, or tutorials so I could begin developing this?

"calculate" an ip address? why would you want to calculate one?
you mean you're trying something like this?

You should start with reading IP Forwarding first. If you don't understand how it forwards, you can't do the computation.

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