What this means
The IEEE assigned the MA-L block 78E7D1 to Hewlett Packard. 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 78:E7:D1, it is Hewlett Packard hardware.
Frequently Asked Questions
Who owns MAC prefix 78E7D1?
78E7D1 is registered to Hewlett Packard 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. Hewlett Packard's block covers 16,777,216 addresses.
What devices use 78E7D1?
Any network device with a MAC address starting 78:E7:D1 was manufactured by or for Hewlett Packard.