What this means
The IEEE assigned the MA-L block FC58DF to Interphone Service. 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 FC:58:DF, it is Interphone Service hardware.
Frequently Asked Questions
Who owns MAC prefix FC58DF?
FC58DF is registered to Interphone Service 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. Interphone Service's block covers 16,777,216 addresses.
What devices use FC58DF?
Any network device with a MAC address starting FC:58:DF was manufactured by or for Interphone Service.