What this means
The IEEE assigned the MA-L block 04C5A4 to Cisco Systems, 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:C5:A4, it is Cisco Systems, Inc hardware.
Frequently Asked Questions
Who owns MAC prefix 04C5A4?
04C5A4 is registered to Cisco Systems, 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. Cisco Systems, Inc's block covers 16,777,216 addresses.
What devices use 04C5A4?
Any network device with a MAC address starting 04:C5:A4 was manufactured by or for Cisco Systems, Inc.