What this means
The IEEE assigned the MA-L block 40A5EF to Shenzhen Four Seas Global Link Network Technology 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 40:A5:EF, it is Shenzhen Four Seas Global Link Network Technology Co., Ltd. hardware.
Frequently Asked Questions
Who owns MAC prefix 40A5EF?
40A5EF is registered to Shenzhen Four Seas Global Link Network Technology 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 Four Seas Global Link Network Technology Co., Ltd.'s block covers 16,777,216 addresses.
What devices use 40A5EF?
Any network device with a MAC address starting 40:A5:EF was manufactured by or for Shenzhen Four Seas Global Link Network Technology Co., Ltd..