Whatmask GUI is a A.S.S. wrapper to the cli subnet mask calculator whatmask.
To use whatmask you need Mac OS X 10.1.2 or the December 2001 Developer Tools installed.
1.0 is initial release. It includes the whatmask source code and the A.S.S. source code.
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Find any bugs or want to make a feature request email me at them@mac.com