Who owns MAC prefix 000199?

000199 is registered to HeiSei Electronics in the IEEE MA-L registry.

What devices use 000199?

Any network device with a MAC address starting 00:01:99 was manufactured by or for HeiSei Electronics.

MA-L · OUI prefix

HeiSei Electronics

Any MAC address starting 00:01:99 is registered to HeiSei Electronics in TW.

OUI prefix	000199
Vendor	HeiSei Electronics
Registry	MA-L (24-bit, large block)
Country	TW
Example MAC	00:01:99:00:00:00

What this means

The IEEE assigned the MA-L block 000199 to HeiSei Electronics. 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 00:01:99, it is HeiSei Electronics hardware.

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