What this means
The IEEE assigned the MA-M block AC64DDB to Groupe Citypassenger 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:64:DD:B, it is Groupe Citypassenger Inc hardware.
Frequently Asked Questions
Who owns MAC prefix AC64DDB?
AC64DDB is registered to Groupe Citypassenger Inc in the IEEE MA-M registry.
What does the MA-M registry type mean?
An MA-M assignment covers 28 bits of the address, giving the vendor 1,048,576 device addresses, a quarter of a full MA-L block. Groupe Citypassenger Inc's block covers 1,048,576 addresses.
What devices use AC64DDB?
Any network device with a MAC address starting AC:64:DD:B was manufactured by or for Groupe Citypassenger Inc.