Examples relate to operating mode configuration. An apparatus may include a memory resource storing executable instructions. Instructions may include instructions to receive a message from a host computing device coupled to the apparatus. The message may include a Host Based Media Access Control Address (HBMA). Instructions may further include instructions to configure the apparatus using the HBMAin response to a determination that the apparatus is in a particular operating mode. The apparatus may further include a processing resource to execute the instructions stored on the memory resource.