What this means
The IEEE assigned the MA-L block B891C9 to Handreamnet. 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 B8:91:C9, it is Handreamnet hardware.
Frequently Asked Questions
Who owns MAC prefix B891C9?
B891C9 is registered to Handreamnet 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. Handreamnet's block covers 16,777,216 addresses.
What devices use B891C9?
Any network device with a MAC address starting B8:91:C9 was manufactured by or for Handreamnet.