What this means
The IEEE assigned the MA-L block 18EFC0 to Sercomm Japan 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 18:EF:C0, it is Sercomm Japan Corporation hardware.
Frequently Asked Questions
Who owns MAC prefix 18EFC0?
18EFC0 is registered to Sercomm Japan 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. Sercomm Japan Corporation's block covers 16,777,216 addresses.
What devices use 18EFC0?
Any network device with a MAC address starting 18:EF:C0 was manufactured by or for Sercomm Japan Corporation.