What this means
The IEEE assigned the MA-M block ACEF923 to JiZhiKang (Beijing) 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 AC:EF:92:3, it is JiZhiKang (Beijing) Technology Co., Ltd hardware.
Frequently Asked Questions
Who owns MAC prefix ACEF923?
ACEF923 is registered to JiZhiKang (Beijing) Technology Co., Ltd in the IEEE MA-M registry.
What does the MA-M registry type mean?
An MA-M assignment covers 28 bits of the address, giving the vendor 1,048,576 device addresses, a quarter of a full MA-L block. JiZhiKang (Beijing) Technology Co., Ltd's block covers 1,048,576 addresses.
What devices use ACEF923?
Any network device with a MAC address starting AC:EF:92:3 was manufactured by or for JiZhiKang (Beijing) Technology Co., Ltd.