What this means
The IEEE assigned the MA-L block B4B15A to Siemens AG Energy Management Division. 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:B1:5A, it is Siemens AG Energy Management Division hardware.
Frequently Asked Questions
Who owns MAC prefix B4B15A?
B4B15A is registered to Siemens AG Energy Management Division 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. Siemens AG Energy Management Division's block covers 16,777,216 addresses.
What devices use B4B15A?
Any network device with a MAC address starting B4:B1:5A was manufactured by or for Siemens AG Energy Management Division.