What this means
The IEEE assigned the MA-L block B4E9A3 to port industrial automation 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 B4:E9:A3, it is port industrial automation GmbH hardware.
Frequently Asked Questions
Who owns MAC prefix B4E9A3?
B4E9A3 is registered to port industrial automation 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. port industrial automation GmbH's block covers 16,777,216 addresses.
What devices use B4E9A3?
Any network device with a MAC address starting B4:E9:A3 was manufactured by or for port industrial automation GmbH.