What this means
The IEEE assigned the MA-L block EC42B4 to ADC Corporation. 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:42:B4, it is ADC Corporation hardware.
Frequently Asked Questions
Who owns MAC prefix EC42B4?
EC42B4 is registered to ADC Corporation 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. ADC Corporation's block covers 16,777,216 addresses.
What devices use EC42B4?
Any network device with a MAC address starting EC:42:B4 was manufactured by or for ADC Corporation.