What this means
The IEEE assigned the MA-L block 04C991 to Phistek INC.. 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 04:C9:91, it is Phistek INC. hardware.
Frequently Asked Questions
Who owns MAC prefix 04C991?
04C991 is registered to Phistek INC. 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. Phistek INC.'s block covers 16,777,216 addresses.
What devices use 04C991?
Any network device with a MAC address starting 04:C9:91 was manufactured by or for Phistek INC..