Who owns MAC prefix 644FB0?

644FB0 is registered to Hyunjin.com in the IEEE MA-L registry.

What devices use 644FB0?

Any network device with a MAC address starting 64:4F:B0 was manufactured by or for Hyunjin.com.

MA-L · OUI prefix

Hyunjin.com

Any MAC address starting 64:4F:B0 is registered to Hyunjin.com in KR.

OUI prefix	644FB0
Vendor	Hyunjin.com
Registry	MA-L (24-bit, large block)
Country	KR
Example MAC	64:4F:B0:00:00:00

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.

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