What this means
The IEEE assigned the MA-L block D45251 to IBT Ingenieurbureau Broennimann Thun. 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 D4:52:51, it is IBT Ingenieurbureau Broennimann Thun hardware.
Frequently Asked Questions
Who owns MAC prefix D45251?
D45251 is registered to IBT Ingenieurbureau Broennimann Thun 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. IBT Ingenieurbureau Broennimann Thun's block covers 16,777,216 addresses.
What devices use D45251?
Any network device with a MAC address starting D4:52:51 was manufactured by or for IBT Ingenieurbureau Broennimann Thun.