What this means
The IEEE assigned the MA-S block 8C1F643F9 to YU YAN SYSTEM 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 8C:1F:64:3F:9, it is YU YAN SYSTEM TECHNOLOGY CO., LTD. hardware.
Frequently Asked Questions
Who owns MAC prefix 8C1F643F9?
8C1F643F9 is registered to YU YAN SYSTEM TECHNOLOGY CO., LTD. in the IEEE MA-S registry.
What does the MA-S registry type mean?
An MA-S assignment, formerly called OUI-36, covers 36 bits, giving the vendor 4,096 device addresses, the smallest block the IEEE issues. YU YAN SYSTEM TECHNOLOGY CO., LTD.'s block covers 4,096 addresses.
What devices use 8C1F643F9?
Any network device with a MAC address starting 8C:1F:64:3F:9 was manufactured by or for YU YAN SYSTEM TECHNOLOGY CO., LTD..