What this means
The IEEE assigned the MA-L block 000391 to Advanced Digital Broadcast, 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 00:03:91, it is Advanced Digital Broadcast, Ltd. hardware.
Frequently Asked Questions
Who owns MAC prefix 000391?
000391 is registered to Advanced Digital Broadcast, 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. Advanced Digital Broadcast, Ltd.'s block covers 16,777,216 addresses.
What devices use 000391?
Any network device with a MAC address starting 00:03:91 was manufactured by or for Advanced Digital Broadcast, Ltd..