What this means
The IEEE assigned the MA-L block 0C3956 to Observator instruments. 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 0C:39:56, it is Observator instruments hardware.
Frequently Asked Questions
Who owns MAC prefix 0C3956?
0C3956 is registered to Observator instruments 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. Observator instruments's block covers 16,777,216 addresses.
What devices use 0C3956?
Any network device with a MAC address starting 0C:39:56 was manufactured by or for Observator instruments.