What this means
The IEEE assigned the MA-L block 644FB0 to Hyunjin.com. 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 64:4F:B0, it is Hyunjin.com hardware.
Frequently Asked Questions
Who owns MAC prefix 644FB0?
644FB0 is registered to Hyunjin.com 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. Hyunjin.com's block covers 16,777,216 addresses.
What devices use 644FB0?
Any network device with a MAC address starting 64:4F:B0 was manufactured by or for Hyunjin.com.