What this means
The IEEE assigned the MA-L block 201D03 to Elatec 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 20:1D:03, it is Elatec GmbH hardware.
Frequently Asked Questions
Who owns MAC prefix 201D03?
201D03 is registered to Elatec 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. Elatec GmbH's block covers 16,777,216 addresses.
What devices use 201D03?
Any network device with a MAC address starting 20:1D:03 was manufactured by or for Elatec GmbH.