What this means
The IEEE assigned the MA-L block BC903A to Robert Bosch GmbH. Every network interface they manufacture under this block has a MAC address beginning with these digits, followed by a unique per-device identifier. If a device on your network shows a MAC starting BC:90:3A, it is Robert Bosch GmbH hardware.
Frequently Asked Questions
Who owns MAC prefix BC903A?
BC903A is registered to Robert Bosch GmbH in the IEEE MA-L registry.
What does the MA-L registry type mean?
An MA-L assignment, the IEEE's original OUI format, gives the vendor the first three octets and 16,777,216 device addresses under them. Robert Bosch GmbH's block covers 16,777,216 addresses.
What devices use BC903A?
Any network device with a MAC address starting BC:90:3A was manufactured by or for Robert Bosch GmbH.