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.
Frequently Asked Questions
Who owns MAC prefix 001D99?
001D99 is registered to Cyan Optic, 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. Cyan Optic, Inc.'s block covers 16,777,216 addresses.
What devices use 001D99?
Any network device with a MAC address starting 00:1D:99 was manufactured by or for Cyan Optic, Inc..