The Microchip AT24MAC402-SSHM-B 2Kb Serial EEPROM device is an application-specific product that contains a unique IEEE-provided 48-bit pre-programmed MAC/EUI address to enable a connected device to connect to the Internet or local network. The device also contains a unique read-only 128-bit serial number and 2Kb of user-accessible serial EEPROM non-volatile memory (NVM) storage.