What this means
The IEEE assigned the MA-L block EC9B75 to Roku, 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 EC:9B:75, it is Roku, Inc hardware.
Frequently Asked Questions
Who owns MAC prefix EC9B75?
EC9B75 is registered to Roku, 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. Roku, Inc's block covers 16,777,216 addresses.
What devices use EC9B75?
Any network device with a MAC address starting EC:9B:75 was manufactured by or for Roku, Inc.