What this means
The IEEE assigned the MA-L block 000C21 to Faculty of Science and Technology, Keio University. 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 00:0C:21, it is Faculty of Science and Technology, Keio University hardware.
Frequently Asked Questions
Who owns MAC prefix 000C21?
000C21 is registered to Faculty of Science and Technology, Keio University 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. Faculty of Science and Technology, Keio University's block covers 16,777,216 addresses.
What devices use 000C21?
Any network device with a MAC address starting 00:0C:21 was manufactured by or for Faculty of Science and Technology, Keio University.