What this means
The IEEE assigned the MA-L block D05533 to Palo Alto Networks. 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 D0:55:33, it is Palo Alto Networks hardware.
Frequently Asked Questions
Who owns MAC prefix D05533?
D05533 is registered to Palo Alto Networks 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. Palo Alto Networks's block covers 16,777,216 addresses.
What devices use D05533?
Any network device with a MAC address starting D0:55:33 was manufactured by or for Palo Alto Networks.