Who owns MAC prefix B4EF04?

B4EF04 is registered to DAIHAN Scientific Co., Ltd. in the IEEE MA-L registry.

What devices use B4EF04?

Any network device with a MAC address starting B4:EF:04 was manufactured by or for DAIHAN Scientific Co., Ltd..

MA-L · OUI prefix

DAIHAN Scientific Co., Ltd.

Any MAC address starting B4:EF:04 is registered to DAIHAN Scientific Co., Ltd. in KR.

OUI prefix	B4EF04
Vendor	DAIHAN Scientific Co., Ltd.
Registry	MA-L (24-bit, large block)
Country	KR
Example MAC	B4:EF:04:00:00:00

What this means

The IEEE assigned the MA-L block B4EF04 to DAIHAN Scientific Co., Ltd.. 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 B4:EF:04, it is DAIHAN Scientific Co., Ltd. hardware.

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