I have recently revisited the library I posted earlier in this thread and found a problem with it on newer Windows versions.
I fixed it and added a function to retrieve the currently active network adapters and their IP addresses.
It should be in LabVIEW 2009 format and should work for both 32-bit and 64-bit versions of Windows. Obviously Windows only as it uses Windows API functions.
Rolf Kalbermatter
My Blog 
DEMO, Electronic and Mechanical Support department, room 36.LB00.390