What this means
The IEEE assigned the MA-L block AC3FA4 to TAIYO YUDEN 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:3F:A4, it is TAIYO YUDEN CO.,LTD hardware.
Frequently Asked Questions
Who owns MAC prefix AC3FA4?
AC3FA4 is registered to TAIYO YUDEN 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. TAIYO YUDEN CO.,LTD's block covers 16,777,216 addresses.
What devices use AC3FA4?
Any network device with a MAC address starting AC:3F:A4 was manufactured by or for TAIYO YUDEN CO.,LTD.