What this means
The IEEE assigned the MA-L block 681DEF to Shenzhen CYX 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 68:1D:EF, it is Shenzhen CYX Technology Co., Ltd. hardware.
Frequently Asked Questions
Who owns MAC prefix 681DEF?
681DEF is registered to Shenzhen CYX 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 CYX Technology Co., Ltd.'s block covers 16,777,216 addresses.
What devices use 681DEF?
Any network device with a MAC address starting 68:1D:EF was manufactured by or for Shenzhen CYX Technology Co., Ltd..