What this means
The IEEE assigned the MA-L block 3877CD to KOKUSAI ELECTRIC CORPORATION. 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 38:77:CD, it is KOKUSAI ELECTRIC CORPORATION hardware.
Frequently Asked Questions
Who owns MAC prefix 3877CD?
3877CD is registered to KOKUSAI ELECTRIC CORPORATION 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. KOKUSAI ELECTRIC CORPORATION's block covers 16,777,216 addresses.
What devices use 3877CD?
Any network device with a MAC address starting 38:77:CD was manufactured by or for KOKUSAI ELECTRIC CORPORATION.