What this means
The IEEE assigned the MA-L block 6401FB to Landis+Gyr GmbH. 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 64:01:FB, it is Landis+Gyr GmbH hardware.
Frequently Asked Questions
Who owns MAC prefix 6401FB?
6401FB is registered to Landis+Gyr GmbH 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. Landis+Gyr GmbH's block covers 16,777,216 addresses.
What devices use 6401FB?
Any network device with a MAC address starting 64:01:FB was manufactured by or for Landis+Gyr GmbH.