What this means
The IEEE assigned the MA-L block 0023E9 to F5 Inc.. 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 00:23:E9, it is F5 Inc. hardware.
Frequently Asked Questions
Who owns MAC prefix 0023E9?
0023E9 is registered to F5 Inc. 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. F5 Inc.'s block covers 16,777,216 addresses.
What devices use 0023E9?
Any network device with a MAC address starting 00:23:E9 was manufactured by or for F5 Inc..