What devices use 0021BF?

Any network device with a MAC address starting 00:21:BF was manufactured by or for Hitachi High-Tech Control Systems Corporation.

MA-L · OUI prefix

Hitachi High-Tech Control Systems Corporation

Q: Who owns MAC prefix 0021BF?

0021BF is registered to Hitachi High-Tech Control Systems Corporation in the IEEE MA-L registry.

Any MAC address starting 00:21:BF is registered to Hitachi High-Tech Control Systems Corporation in JP.

OUI prefix	0021BF
Vendor	Hitachi High-Tech Control Systems Corporation
Registry	MA-L (24-bit, large block)
Country	JP
Example MAC	00:21:BF:00:00:00

What this means

The IEEE assigned the MA-L block 0021BF to Hitachi High-Tech Control Systems Corporation. 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:BF, it is Hitachi High-Tech Control Systems Corporation hardware.

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