What this means
The IEEE assigned the MA-L block 0021AC to Infrared Integrated 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 00:21:AC, it is Infrared Integrated Systems Ltd hardware.
Frequently Asked Questions
Who owns MAC prefix 0021AC?
0021AC is registered to Infrared Integrated 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. Infrared Integrated Systems Ltd's block covers 16,777,216 addresses.
What devices use 0021AC?
Any network device with a MAC address starting 00:21:AC was manufactured by or for Infrared Integrated Systems Ltd.