What this means
The IEEE assigned the MA-L block 001B5F to Alien Technology. 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 00:1B:5F, it is Alien Technology hardware.
Frequently Asked Questions
Who owns MAC prefix 001B5F?
001B5F is registered to Alien Technology 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. Alien Technology's block covers 16,777,216 addresses.
What devices use 001B5F?
Any network device with a MAC address starting 00:1B:5F was manufactured by or for Alien Technology.