What this means
The IEEE assigned the MA-L block A4F522 to CHOFU SEISAKUSHO 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 A4:F5:22, it is CHOFU SEISAKUSHO CO.,LTD hardware.
Frequently Asked Questions
Who owns MAC prefix A4F522?
A4F522 is registered to CHOFU SEISAKUSHO 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. CHOFU SEISAKUSHO CO.,LTD's block covers 16,777,216 addresses.
What devices use A4F522?
Any network device with a MAC address starting A4:F5:22 was manufactured by or for CHOFU SEISAKUSHO CO.,LTD.