Who owns MAC prefix ACE9AA?

ACE9AA is registered to Hay Systems Ltd in the IEEE MA-L registry.

What devices use ACE9AA?

Any network device with a MAC address starting AC:E9:AA was manufactured by or for Hay Systems Ltd.

MA-L · OUI prefix

Hay Systems Ltd

Any MAC address starting AC:E9:AA is registered to Hay Systems Ltd.

OUI prefix	ACE9AA
Vendor	Hay Systems Ltd
Registry	MA-L (24-bit, large block)
Example MAC	AC:E9:AA:00:00:00

What this means

The IEEE assigned the MA-L block ACE9AA to Hay Systems 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 AC:E9:AA, it is Hay Systems Ltd hardware.

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