What this means
The IEEE assigned the MA-L block 00905B to Parameter LLC. 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 00:90:5B, it is Parameter LLC hardware.
Frequently Asked Questions
Who owns MAC prefix 00905B?
00905B is registered to Parameter LLC 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. Parameter LLC's block covers 16,777,216 addresses.
What devices use 00905B?
Any network device with a MAC address starting 00:90:5B was manufactured by or for Parameter LLC.