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.
Frequently Asked Questions
Who owns MAC prefix ACE9AA?
ACE9AA is registered to Hay Systems Ltd in the IEEE MA-L registry.
What does the MA-L registry type mean?
An MA-L assignment, the IEEE's original OUI format, gives the vendor the first three octets and 16,777,216 device addresses under them. Hay Systems Ltd's block covers 16,777,216 addresses.
What devices use ACE9AA?
Any network device with a MAC address starting AC:E9:AA was manufactured by or for Hay Systems Ltd.