What this means
The IEEE assigned the MA-L block 184F5D to Japan Radio 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 18:4F:5D, it is Japan Radio Co., Ltd hardware.
Frequently Asked Questions
Who owns MAC prefix 184F5D?
184F5D is registered to Japan Radio 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. Japan Radio Co., Ltd's block covers 16,777,216 addresses.
What devices use 184F5D?
Any network device with a MAC address starting 18:4F:5D was manufactured by or for Japan Radio Co., Ltd.