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getiftable (iphlpapi)
 
.
Summary
P/ invoque for GetIfTable iphlpapi function. Only C# example. You need also a MIB_IFROW structure

C# Signature:

    /// <summary>
    /// Get the information about the current Network adapter in the system
    /// </summary>
    /// <param name="pIfTable">A pointer to a buffer that receives the interface table as a MIB_IFTABLE structure</param>
    /// <param name="pdwSize">
    /// size of buffer
    /// On input, specifies the size in bytes of the buffer pointed to by the pIfTable parameter.
    /// On output, if the buffer is not large enough to hold the returned interface table,
    ///  the function sets this parameter equal to the required buffer size in bytes
    /// </param>
    /// <param name="bOrder">
    /// sort the table by index
    /// A Boolean value that specifies whether the returned interface table should be sorted
    /// in ascending order by interface index. If this parameter is TRUE, the table is sorted.
    /// </param>
    /// <returns>
    /// If the function succeeds, the return value is
    /// NO_ERROR = 0
    /// ERROR_INSUFFICIENT_BUFFER = 122
    /// </returns>
    [DllImport("Iphlpapi.dll", SetLastError=true)]
    public static extern uint GetIfTable(IntPtr pIfTable, ref uint pdwSize, bool bOrder);

VB Signature:

Declare Function GetIfTable Lib "iphlpapi.dll" (TODO) As TODO

User-Defined Types:

None.

Alternative Managed API:

System.Net.NetworkInformation.NetworkInterface.GetAllNetworkInterfaces()

Notes:

None.

Tips & Tricks:

Get if Table Wrapper Class

/// <summary>
    /// Wrapper to unmanaged code. to use all in C# declarations
    /// </summary>
    public class IPHelperWrapper
    {
    #region  fields
    /// <summary>
    /// MIB_IFROW Declaration
    /// </summary>
    protected static IPHelperTraslation.MIB_IFROW netWorkInfoBlock;

    /// <summary>
    /// MIB_IFROW structure array. Content the active networks connection
    /// </summary>
    public static IPHelperTraslation.MIB_IFROW[] mRows;
    #endregion

    #region Wrapper Method
    /// <summary>
    /// Get the Active Interface networks in an array of MIB_IFROW.
    /// each network comes in a row. See MIB_IFROW in IPHelper Traslation for more
    /// information about MIB_IFROW
    /// </summary>
    /// <returns>
    /// A array of MIB_IFROW structure
    /// </returns>
    public static IPHelperTraslation.MIB_IFROW[] GetNetworkInterfaceBlock()
    {

        uint size = 0;
        IPHelperTraslation.GetIfTable(IntPtr.Zero, ref size, false);
        IntPtr buf = Marshal.AllocHGlobal((int)size);
        IPHelperTraslation.GetIfTable(buf, ref size, false);
        int numEntries = Marshal.ReadInt32(buf);
        int pRows = 4 + (int)buf;
        mRows = new IPHelperTraslation.MIB_IFROW[numEntries];
        for (int i = 0; i < numEntries; i++)
        {
        mRows[i] = (IPHelperTraslation.MIB_IFROW)Marshal.PtrToStructure((IntPtr)pRows, typeof(IPHelperTraslation.MIB_IFROW));
        pRows += Marshal.SizeOf(typeof(IPHelperTraslation.MIB_IFROW));
        }
        Marshal.FreeHGlobal(buf);
        return mRows;

    }
    #endregion
    }

Documentation
GetIfTable on MSDN

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