What this means
The IEEE assigned the MA-L block 44C39B to OOO RUBEZH NPO. 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 44:C3:9B, it is OOO RUBEZH NPO hardware.
Frequently Asked Questions
Who owns MAC prefix 44C39B?
44C39B is registered to OOO RUBEZH NPO 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. OOO RUBEZH NPO's block covers 16,777,216 addresses.
What devices use 44C39B?
Any network device with a MAC address starting 44:C3:9B was manufactured by or for OOO RUBEZH NPO.