What this means
The IEEE assigned the MA-L block 90842B to LEGO System A/S. 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 90:84:2B, it is LEGO System A/S hardware.
Frequently Asked Questions
Who owns MAC prefix 90842B?
90842B is registered to LEGO System A/S 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. LEGO System A/S's block covers 16,777,216 addresses.
What devices use 90842B?
Any network device with a MAC address starting 90:84:2B was manufactured by or for LEGO System A/S.