Who owns MAC prefix 0021B4?

0021B4 is registered to APRO MEDIA CO., LTD in the IEEE MA-L registry.

What devices use 0021B4?

Any network device with a MAC address starting 00:21:B4 was manufactured by or for APRO MEDIA CO., LTD.

MA-L · OUI prefix

APRO MEDIA CO., LTD

Any MAC address starting 00:21:B4 is registered to APRO MEDIA CO., LTD in KR.

OUI prefix	0021B4
Vendor	APRO MEDIA CO., LTD
Registry	MA-L (24-bit, large block)
Country	KR
Example MAC	00:21:B4:00:00:00

What this means

The IEEE assigned the MA-L block 0021B4 to APRO MEDIA 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 00:21:B4, it is APRO MEDIA CO., LTD hardware.

Look up another MAC