What this means
The IEEE assigned the MA-L block 7487BB to Ciena Corporation. 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 74:87:BB, it is Ciena Corporation hardware.
Frequently Asked Questions
Who owns MAC prefix 7487BB?
7487BB is registered to Ciena Corporation 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. Ciena Corporation's block covers 16,777,216 addresses.
What devices use 7487BB?
Any network device with a MAC address starting 74:87:BB was manufactured by or for Ciena Corporation.