After dealing with several options, most of them involving a call to a command line tool and parsing the output, which is not really elegant. Other solutions were based on obsolete VBScript client code and ActiveX, even worse.
Finally I found in the excellent
pinvoke.net site a very nice and simple example using a simple call to
iphlpapi.dll’s SendARP method. The trick was to use
ARP to get the MAC from the IP.
Note that this has it’s limitations, as I will only work if the remote machine is in the same network and the packet does not need to go through a router. I was enough for our needs.
Here’s the code I adapted from the example:
public static string GetMAC ( IPAddress ipAddr )
var mac = new byte [ 6 ];
var len = ( uint ) mac . Length ;
var result = SendARP (( int ) ipAddr . Address , 0 , mac , ref len );
if ( result != 0 )
return "MAC not found!" ;
var str = new string [( int ) len ];
for ( var i = 0 ; i & lt ; len ; i ++)
str [ i ] = mac [ i ]. ToString ( "x2" );
return string . Join ( ":" , str );
[ DllImport ( "iphlpapi.dll" , ExactSpelling = true )]
private static extern int SendARP ( int destIP , int srcIP , byte  pMacAddr , ref uint phyAddrLen );