What this means
The IEEE assigned the MA-S block 8C1F64905 to Qualitrol LLC. 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:64:90:5, it is Qualitrol LLC hardware.
Frequently Asked Questions
Who owns MAC prefix 8C1F64905?
8C1F64905 is registered to Qualitrol LLC 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. Qualitrol LLC's block covers 4,096 addresses.
What devices use 8C1F64905?
Any network device with a MAC address starting 8C:1F:64:90:5 was manufactured by or for Qualitrol LLC.