You could try the folowing code:

code:
Break On
? 'MAC for NIC 1 = ' + GetMac(@IPAddress0)
? 'MAC for NIC 2 = ' + GetMac(@IPAddress1)
? 'MAC for NIC 3 = ' + GetMac(@IPAddress2)
? 'MAC for NIC 4 = ' + GetMac(@IPAddress3)
Get $x
 
Function GetMac($IpAdr)
	Dim $oWMI,$NICs,$NIC,$ChkIP
	$IpAdr = Join(Split($IpAdr),'')
	$oWMI = GetObject("winmgmts:\\.\root\cimv2")
	$NICs = $oWMI.ExecQuery("Select * from Win32_NetworkAdapterConfiguration where IPEnabled=TRUE")
	For Each $NIC In $NICs
		For Each $ChkIP In $NIC.IPAddress
			If $ChkIP = $IpAdr
				$GetMac = Join(Split($NIC.MACAddress,':'),'')
			EndIf
		Next
	Next
EndFunction
-Erik