What this means
The IEEE assigned the MA-L block 74FC45 to SIEMENS AG. 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 74:FC:45, it is SIEMENS AG hardware.
Frequently Asked Questions
Who owns MAC prefix 74FC45?
74FC45 is registered to SIEMENS AG 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's block covers 16,777,216 addresses.
What devices use 74FC45?
Any network device with a MAC address starting 74:FC:45 was manufactured by or for SIEMENS AG.