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    <p>@steve0, to retrieve the mac address of an <strong>Network Adapter</strong> you can use the <code>WMI</code> and the <a href="http://msdn.microsoft.com/en-us/library/aa394217%28VS.85%29.aspx" rel="nofollow noreferrer"><code>Win32_NetworkAdapterConfiguration</code></a> Class and check the <code>MACAddress</code> property.</p> <p>Check this code:</p> <pre><code>program WMI_MAC; {$APPTYPE CONSOLE} uses SysUtils ,ActiveX ,ComObj ,Variants; function VarToStrNil(Value:Variant):string; //Dummy function to onvert an variant value to string begin if VarIsNull(Value) then Result:='' else Result:=VarToStr(Value); end; Procedure GetMacAddress; var objWMIService : OLEVariant; colItems : OLEVariant; colItem : OLEVariant; oEnum : IEnumvariant; iValue : LongWord; wmiHost, root, wmiClass: string; function GetWMIObject(const objectName: String): IDispatch; var chEaten: Integer; BindCtx: IBindCtx;//for access to a bind context Moniker: IMoniker;//Enables you to use a moniker object begin OleCheck(CreateBindCtx(0, bindCtx)); OleCheck(MkParseDisplayName(BindCtx, StringToOleStr(objectName), chEaten, Moniker));//Converts a string into a moniker that identifies the object named by the string OleCheck(Moniker.BindToObject(BindCtx, nil, IDispatch, Result));//Binds to the specified object end; begin wmiHost := '.'; root := 'root\CIMV2'; wmiClass := 'Win32_NetworkAdapterConfiguration'; objWMIService := GetWMIObject(Format('winmgmts:\\%s\%s',[wmiHost,root])); colItems := objWMIService.ExecQuery(Format('SELECT * FROM %s',[wmiClass]),'WQL',0); oEnum := IUnknown(colItems._NewEnum) as IEnumVariant; while oEnum.Next(1, colItem, iValue) = 0 do //if VarToStrNil(colItem.MACAddress)&lt;&gt;'' then //uncomment if you only want list the interfaces with mac adress //if colItem.IPEnabled then // uncomment if you only want list the active interfaces begin WriteLn('Card Description '+VarToStrNil(colItem.Caption)); WriteLn('MACAddress '+VarToStrNil(colItem.MACAddress)); end; end; begin try CoInitialize(nil); try GetMacAddress; Readln; finally CoUninitialize; end; except on E:Exception do Begin Writeln(E.Classname, ': ', E.Message); Readln; End; end; end. </code></pre>
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