What this means
The IEEE assigned the MA-L block B838EF to ADVA Optical Networking 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 B8:38:EF, it is ADVA Optical Networking Ltd. hardware.
Frequently Asked Questions
Who owns MAC prefix B838EF?
B838EF is registered to ADVA Optical Networking 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. ADVA Optical Networking Ltd.'s block covers 16,777,216 addresses.
What devices use B838EF?
Any network device with a MAC address starting B8:38:EF was manufactured by or for ADVA Optical Networking Ltd..