What this means
The IEEE assigned the MA-L block 1CD21E 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 1C:D2:1E, it is Juniper Networks hardware.
Frequently Asked Questions
Who owns MAC prefix 1CD21E?
1CD21E 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 1CD21E?
Any network device with a MAC address starting 1C:D2:1E was manufactured by or for Juniper Networks.