What this means
The IEEE assigned the MA-L block EC21E5 to Toshiba. 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 EC:21:E5, it is Toshiba hardware.
Frequently Asked Questions
Who owns MAC prefix EC21E5?
EC21E5 is registered to Toshiba 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. Toshiba's block covers 16,777,216 addresses.
What devices use EC21E5?
Any network device with a MAC address starting EC:21:E5 was manufactured by or for Toshiba.