What this means
The IEEE assigned the MA-L block 203389 to Google, 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 20:33:89, it is Google, Inc. hardware.
Frequently Asked Questions
Who owns MAC prefix 203389?
203389 is registered to Google, 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. Google, Inc.'s block covers 16,777,216 addresses.
What devices use 203389?
Any network device with a MAC address starting 20:33:89 was manufactured by or for Google, Inc..