Change your Mac Address without rebooting your system. MAC Change is a network utility for Windows that allows you to spoofing Mac Address of your network card. A Mac (Media Access Control) is an unique identifier for any network card assigned by the IEEE (Institute of Electrical and Electronics Engineers). MAC Change also include a very useful database that contains all manufacturer of the card known as the Organisational Unique Identifier (OUI). The search functions allows you to find out related information through a pleasant graphical user interface.