Who owns MAC prefix 001D99?

001D99 is registered to Cyan Optic, Inc. in the IEEE MA-L registry.

What devices use 001D99?

Any network device with a MAC address starting 00:1D:99 was manufactured by or for Cyan Optic, Inc..

MA-L · OUI prefix

Cyan Optic, Inc.

Any MAC address starting 00:1D:99 is registered to Cyan Optic, Inc. in US.

OUI prefix	001D99
Vendor	Cyan Optic, Inc.
Registry	MA-L (24-bit, large block)
Country	US
Example MAC	00:1D:99:00:00:00

What this means

The IEEE assigned the MA-L block 001D99 to Cyan Optic, 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 00:1D:99, it is Cyan Optic, Inc. hardware.

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