What this means
The IEEE assigned the MA-L block D4B43E to Messcomp Datentechnik 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 D4:B4:3E, it is Messcomp Datentechnik GmbH hardware.
Frequently Asked Questions
Who owns MAC prefix D4B43E?
D4B43E is registered to Messcomp Datentechnik 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. Messcomp Datentechnik GmbH's block covers 16,777,216 addresses.
What devices use D4B43E?
Any network device with a MAC address starting D4:B4:3E was manufactured by or for Messcomp Datentechnik GmbH.