Marcel Vogt wrote: How must i change this, to show the IP-Adressses of the Computer? Only with Changing to "Win32_NetworkAdapterConfiguration" and "IPAddress" instead of "SerialNumber" doesn't works. I believe that using WMI is the easier but not the best option to work with IP addresses.You have entire IP helper API right here http://msdn.microsoft.com/en-us/library/aa366071(VS.85).aspx[^] which contains set of functions for IP management.For example GetIpAddrTable function will help you to examine IP-v4 mapping table. Life is a stage and we are all actors!