What this means
The IEEE assigned the MA-L block 04C09C to Tellabs 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 04:C0:9C, it is Tellabs Inc. hardware.
Frequently Asked Questions
Who owns MAC prefix 04C09C?
04C09C is registered to Tellabs 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. Tellabs Inc.'s block covers 16,777,216 addresses.
What devices use 04C09C?
Any network device with a MAC address starting 04:C0:9C was manufactured by or for Tellabs Inc..