Who owns MAC prefix D45556?

D45556 is registered to Fiber Mountain Inc. in the IEEE MA-L registry.

What devices use D45556?

Any network device with a MAC address starting D4:55:56 was manufactured by or for Fiber Mountain Inc..

MA-L · OUI prefix

Fiber Mountain Inc.

Any MAC address starting D4:55:56 is registered to Fiber Mountain Inc. in US.

OUI prefix	D45556
Vendor	Fiber Mountain Inc.
Registry	MA-L (24-bit, large block)
Country	US
Example MAC	D4:55:56:00:00:00

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.

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