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Yet Another IPv4 Subnet Calculator

Subnet calculators seem to breed like rabbits on the internet. Not that I cannot access them or do not find them useful.
This was an excercise in learning to do VLSM calculations in VB.NET on an ASP.NET web site.
It is not pretty...it will change as I learn ASP.NET.
This does not support IPv6 because VB.NET does not support 128 bit numbers (yet).
I guess I will be learning C# next.

IP Address/Mask                                Mask Bits
    



IP Valid?     
IP Address      xxx.xxx.xxx.xxx
Subnet Mask      xxx.xxx.xxx.xxx
Mask Bits      xx
Network Bits      xx
Total Host      xxx
First IP      xxx.xxx.xxx.xxx
Last IP      xxx.xxx.xxx.xxx