Who owns MAC prefix 7491BD?

7491BD is registered to Four systems Co.,Ltd. in the IEEE MA-L registry.

What devices use 7491BD?

Any network device with a MAC address starting 74:91:BD was manufactured by or for Four systems Co.,Ltd..

MA-L · OUI prefix

Four systems Co.,Ltd.

Any MAC address starting 74:91:BD is registered to Four systems Co.,Ltd. in TH.

OUI prefix	7491BD
Vendor	Four systems Co.,Ltd.
Registry	MA-L (24-bit, large block)
Country	TH
Example MAC	74:91:BD:00:00:00

What this means

The IEEE assigned the MA-L block 7491BD to Four systems 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 74:91:BD, it is Four systems Co.,Ltd. hardware.

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