Functions like GetIpNetTable
are not currently exposed within the Windows Runtime. In fact, most of the deep IP Helper Functions are not exposed, and cannot be accessed. As such, writing the equivalent style application will be extremely difficult without an external application hosted elsewhere that did the work. You might be able to do some general network scans, but that won't be as effective.
(I'm not sure that there were equivalent classes in .NET either. The native Win32 API calls were available from managed code.)