What this means
The IEEE assigned the MA-L block D4F0B4 to Napco Security Technologies. 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:F0:B4, it is Napco Security Technologies hardware.
Frequently Asked Questions
Who owns MAC prefix D4F0B4?
D4F0B4 is registered to Napco Security Technologies 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. Napco Security Technologies's block covers 16,777,216 addresses.
What devices use D4F0B4?
Any network device with a MAC address starting D4:F0:B4 was manufactured by or for Napco Security Technologies.