What this means
The IEEE assigned the MA-L block A8B1D4 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 A8:B1:D4, it is Cisco Systems, Inc hardware.
Frequently Asked Questions
Who owns MAC prefix A8B1D4?
A8B1D4 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 A8B1D4?
Any network device with a MAC address starting A8:B1:D4 was manufactured by or for Cisco Systems, Inc.