What this means
The IEEE assigned the MA-L block 000D78 to Engineering & Security. 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 00:0D:78, it is Engineering & Security hardware.
Frequently Asked Questions
Who owns MAC prefix 000D78?
000D78 is registered to Engineering & Security 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. Engineering & Security's block covers 16,777,216 addresses.
What devices use 000D78?
Any network device with a MAC address starting 00:0D:78 was manufactured by or for Engineering & Security.