What this means
The IEEE assigned the MA-L block A444D1 to Wingtech Group (HongKong）Limited. 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 A4:44:D1, it is Wingtech Group (HongKong）Limited hardware.
Frequently Asked Questions
Who owns MAC prefix A444D1?
A444D1 is registered to Wingtech Group (HongKong）Limited 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. Wingtech Group (HongKong）Limited's block covers 16,777,216 addresses.
What devices use A444D1?
Any network device with a MAC address starting A4:44:D1 was manufactured by or for Wingtech Group (HongKong）Limited.