What this means
The IEEE assigned the MA-L block EC66D1 to B&W Group LTD. 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:66:D1, it is B&W Group LTD hardware.
Frequently Asked Questions
Who owns MAC prefix EC66D1?
EC66D1 is registered to B&W Group LTD 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. B&W Group LTD's block covers 16,777,216 addresses.
What devices use EC66D1?
Any network device with a MAC address starting EC:66:D1 was manufactured by or for B&W Group LTD.