What this means
The IEEE assigned the MA-L block E481B3 to Shenzhen ACT Industrial Co.,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 E4:81:B3, it is Shenzhen ACT Industrial Co.,Ltd. hardware.
Frequently Asked Questions
Who owns MAC prefix E481B3?
E481B3 is registered to Shenzhen ACT Industrial Co.,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. Shenzhen ACT Industrial Co.,Ltd.'s block covers 16,777,216 addresses.
What devices use E481B3?
Any network device with a MAC address starting E4:81:B3 was manufactured by or for Shenzhen ACT Industrial Co.,Ltd..