Cisco Systems, Inc - MAC Prefix ACD400 (MA-L)

What this means

The IEEE assigned the MA-L block ACD400 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 AC:D4:00, it is Cisco Systems, Inc hardware.

Frequently Asked Questions

Who owns MAC prefix ACD400?

ACD400 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 ACD400?

Any network device with a MAC address starting AC:D4:00 was manufactured by or for Cisco Systems, Inc.

Other Cisco Systems, Inc prefixes

Cisco Systems, Inc holds 1,258 registered blocks in total.

OUI prefix	ACD400
Vendor	Cisco Systems, Inc
Registry	MA-L (24-bit, large block)
Block size	16,777,216 addresses
Country	US
Other blocks by this vendor	1,258 total
Example MAC	AC:D4:00:00:00:00