What this means
The IEEE assigned the MA-L block C042D0 to Juniper 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 C0:42:D0, it is Juniper Networks hardware.
Frequently Asked Questions
Who owns MAC prefix C042D0?
C042D0 is registered to Juniper 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. Juniper Networks's block covers 16,777,216 addresses.
What devices use C042D0?
Any network device with a MAC address starting C0:42:D0 was manufactured by or for Juniper Networks.