What this means
The IEEE assigned the MA-L block D4F527 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 D4:F5:27, it is SIEMENS AG hardware.
Frequently Asked Questions
Who owns MAC prefix D4F527?
D4F527 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 D4F527?
Any network device with a MAC address starting D4:F5:27 was manufactured by or for SIEMENS AG.