What this means
The IEEE assigned the MA-L block 00253B to din Dietmar Nocker Facilitymanagement 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 00:25:3B, it is din Dietmar Nocker Facilitymanagement GmbH hardware.
Frequently Asked Questions
Who owns MAC prefix 00253B?
00253B is registered to din Dietmar Nocker Facilitymanagement 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. din Dietmar Nocker Facilitymanagement GmbH's block covers 16,777,216 addresses.
What devices use 00253B?
Any network device with a MAC address starting 00:25:3B was manufactured by or for din Dietmar Nocker Facilitymanagement GmbH.