What this means
The IEEE assigned the MA-L block D4F5EF to Hewlett Packard Enterprise. 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:F5:EF, it is Hewlett Packard Enterprise hardware.
Frequently Asked Questions
Who owns MAC prefix D4F5EF?
D4F5EF is registered to Hewlett Packard Enterprise 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 Enterprise's block covers 16,777,216 addresses.
What devices use D4F5EF?
Any network device with a MAC address starting D4:F5:EF was manufactured by or for Hewlett Packard Enterprise.