Obtain the MAC address through the IP address, as if only applicable to LAN

Public class classnetgetmac
{
Public classnetgetmac ()
{
}

[Dllimport ("iphlpapi. dll")]
Private Static extern int sendarp (int32 DEST, int32 host, byte [] Mac, ref int32 length );
[Dllimport ("ws2_32.dll")]
Private Static extern int32 inet_addr (string IP );

/// <Summary>
/// Obtain the nic mac address based on the IP address
/// </Summary>
/// <Param name = "ip"> ip address </param>
/// <Returns> the MAC address of the NIC corresponding to the IP address </returns>
Public static string getmacbyip (string IP)
{
Try
{
Byte [] AA = new byte [6];

Int32 ldest = inet_addr (IP); // ip address of the destination

Int64 macinfo = new int64 ();
Int32 Len = 6;
Int res = sendarp (ldest, 0, AA, ref Len );

Return bitconverter. tostring (AA, 0, 6 );;
}
Catch (exception ERR)
{
Throw err;
}
}

}