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.
Frequently Asked Questions
Who owns MAC prefix 000591?
000591 is registered to Active Silicon 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. Active Silicon Ltd's block covers 16,777,216 addresses.
What devices use 000591?
Any network device with a MAC address starting 00:05:91 was manufactured by or for Active Silicon Ltd.