What this means
The IEEE assigned the MA-L block C43875 to Sonos, 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 C4:38:75, it is Sonos, Inc. hardware.
Frequently Asked Questions
Who owns MAC prefix C43875?
C43875 is registered to Sonos, 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. Sonos, Inc.'s block covers 16,777,216 addresses.
What devices use C43875?
Any network device with a MAC address starting C4:38:75 was manufactured by or for Sonos, Inc..