What this means
The IEEE assigned the MA-M block 58FCDB3 to Custom Biogenic Systems. 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 58:FC:DB:3, it is Custom Biogenic Systems hardware.
Frequently Asked Questions
Who owns MAC prefix 58FCDB3?
58FCDB3 is registered to Custom Biogenic Systems in the IEEE MA-M registry.
What does the MA-M registry type mean?
An MA-M assignment covers 28 bits of the address, giving the vendor 1,048,576 device addresses, a quarter of a full MA-L block. Custom Biogenic Systems's block covers 1,048,576 addresses.
What devices use 58FCDB3?
Any network device with a MAC address starting 58:FC:DB:3 was manufactured by or for Custom Biogenic Systems.