What this means
The IEEE assigned the MA-L block 140C5B to PLNetworks. 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 14:0C:5B, it is PLNetworks hardware.
Frequently Asked Questions
Who owns MAC prefix 140C5B?
140C5B is registered to PLNetworks 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. PLNetworks's block covers 16,777,216 addresses.
What devices use 140C5B?
Any network device with a MAC address starting 14:0C:5B was manufactured by or for PLNetworks.