What this means
The IEEE assigned the MA-L block 00809B to JUSTSYSTEM CORPORATION. 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 00:80:9B, it is JUSTSYSTEM CORPORATION hardware.
Frequently Asked Questions
Who owns MAC prefix 00809B?
00809B is registered to JUSTSYSTEM CORPORATION 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. JUSTSYSTEM CORPORATION's block covers 16,777,216 addresses.
What devices use 00809B?
Any network device with a MAC address starting 00:80:9B was manufactured by or for JUSTSYSTEM CORPORATION.