What this means
The IEEE assigned the MA-L block EC74D7 to Grandstream Networks 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 EC:74:D7, it is Grandstream Networks Inc hardware.
Frequently Asked Questions
Who owns MAC prefix EC74D7?
EC74D7 is registered to Grandstream Networks 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. Grandstream Networks Inc's block covers 16,777,216 addresses.
What devices use EC74D7?
Any network device with a MAC address starting EC:74:D7 was manufactured by or for Grandstream Networks Inc.