What this means
The IEEE assigned the MA-L block 000B39 to Keisoku Giken 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 00:0B:39, it is Keisoku Giken Co.,Ltd. hardware.
Frequently Asked Questions
Who owns MAC prefix 000B39?
000B39 is registered to Keisoku Giken 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. Keisoku Giken Co.,Ltd.'s block covers 16,777,216 addresses.
What devices use 000B39?
Any network device with a MAC address starting 00:0B:39 was manufactured by or for Keisoku Giken Co.,Ltd..