What this means
The IEEE assigned the MA-S block 8C1F645B9 to ViewSonic Corp. 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 8C:1F:64:5B:9, it is ViewSonic Corp hardware.
Frequently Asked Questions
Who owns MAC prefix 8C1F645B9?
8C1F645B9 is registered to ViewSonic Corp in the IEEE MA-S registry.
What does the MA-S registry type mean?
An MA-S assignment, formerly called OUI-36, covers 36 bits, giving the vendor 4,096 device addresses, the smallest block the IEEE issues. ViewSonic Corp's block covers 4,096 addresses.
What devices use 8C1F645B9?
Any network device with a MAC address starting 8C:1F:64:5B:9 was manufactured by or for ViewSonic Corp.