What this means
The IEEE assigned the MA-L block D4DF57 to Alpinion Medical Systems. 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:DF:57, it is Alpinion Medical Systems hardware.
Frequently Asked Questions
Who owns MAC prefix D4DF57?
D4DF57 is registered to Alpinion Medical Systems 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. Alpinion Medical Systems's block covers 16,777,216 addresses.
What devices use D4DF57?
Any network device with a MAC address starting D4:DF:57 was manufactured by or for Alpinion Medical Systems.