What this means
The IEEE assigned the MA-L block 08004B to Planning Research Corp.. 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 08:00:4B, it is Planning Research Corp. hardware.
Frequently Asked Questions
Who owns MAC prefix 08004B?
08004B is registered to Planning Research Corp. 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. Planning Research Corp.'s block covers 16,777,216 addresses.
What devices use 08004B?
Any network device with a MAC address starting 08:00:4B was manufactured by or for Planning Research Corp..