What this means
The IEEE assigned the MA-M block EC5BCD9 to C&D Technologies. 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 EC:5B:CD:9, it is C&D Technologies hardware.
Frequently Asked Questions
Who owns MAC prefix EC5BCD9?
EC5BCD9 is registered to C&D Technologies 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. C&D Technologies's block covers 1,048,576 addresses.
What devices use EC5BCD9?
Any network device with a MAC address starting EC:5B:CD:9 was manufactured by or for C&D Technologies.