What this means
The IEEE assigned the MA-L block 142103 to Calix 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 14:21:03, it is Calix Inc. hardware.
Frequently Asked Questions
Who owns MAC prefix 142103?
142103 is registered to Calix 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. Calix Inc.'s block covers 16,777,216 addresses.
What devices use 142103?
Any network device with a MAC address starting 14:21:03 was manufactured by or for Calix Inc..