DivIP
Tool for division IP address and subnet
...DivIP is a freeware for calculating IP address (network/broadcast/usable host range, subnet, VLSM, summary IP, wildcard mask...) released under GNU GPLv3.
-------------------------------
You can find SOURCE CODE of DivIP v2.0.0 here: https://app.box.com/s/vv94jrpa5zyzx29z25mj
Video tutorial: http://www.youtube.com/watch?v=26l7iLYR3f8
Information about DivIP v2.0.0's project:
Programming Language: C# (.NET)
Programming Environment: MS Visual Studio 2013 Ultimate
.NETFramework's version: 3.5
Operating System: Windows
Fonts: Open Sans & MS Sans Serif
P/s:
+ I'm a self-study C# language so may be some elements in project are unnomalized...