How to use the Prime Number Theorem in order to prove Selberg's Formula? Now locate the field "HWaddr". Does every open orientable even-dimensional smooth manifold admit an almost complex structure? A computer's hardware configuration determines its MAC address, while the configuration of the network it is connected to determines its IP address. We had to do this a while back, but I don't think we got it working properly. Each network interface has a unique MAC address. There are several reasons you might want to know the MAC address of a remote computer, and it's easy to do by using a command line utility such as Command Prompt in Windows.