What this means
The IEEE assigned the MA-L block 00005F to Sumitomo Electric Industries, 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 00:00:5F, it is Sumitomo Electric Industries, Ltd hardware.
Frequently Asked Questions
Who owns MAC prefix 00005F?
00005F is registered to Sumitomo Electric Industries, 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. Sumitomo Electric Industries, Ltd's block covers 16,777,216 addresses.
What devices use 00005F?
Any network device with a MAC address starting 00:00:5F was manufactured by or for Sumitomo Electric Industries, Ltd.