Who owns MAC prefix 000591?

000591 is registered to Active Silicon Ltd in the IEEE MA-L registry.

What devices use 000591?

Any network device with a MAC address starting 00:05:91 was manufactured by or for Active Silicon Ltd.

MA-L · OUI prefix

Active Silicon Ltd

Any MAC address starting 00:05:91 is registered to Active Silicon Ltd.

OUI prefix	000591
Vendor	Active Silicon Ltd
Registry	MA-L (24-bit, large block)
Example MAC	00:05:91:00:00:00

What this means

The IEEE assigned the MA-L block 000591 to Active Silicon 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 00:05:91, it is Active Silicon Ltd hardware.

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