What this means
The IEEE assigned the MA-L block 641666 to Nest Labs 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 64:16:66, it is Nest Labs Inc. hardware.
Frequently Asked Questions
Who owns MAC prefix 641666?
641666 is registered to Nest Labs 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. Nest Labs Inc.'s block covers 16,777,216 addresses.
What devices use 641666?
Any network device with a MAC address starting 64:16:66 was manufactured by or for Nest Labs Inc..