What this means
The IEEE assigned the MA-L block D45556 to Fiber Mountain 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 D4:55:56, it is Fiber Mountain Inc. hardware.
Frequently Asked Questions
Who owns MAC prefix D45556?
D45556 is registered to Fiber Mountain 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. Fiber Mountain Inc.'s block covers 16,777,216 addresses.
What devices use D45556?
Any network device with a MAC address starting D4:55:56 was manufactured by or for Fiber Mountain Inc..