What this means
The IEEE assigned the MA-L block 1C7B21 to Sony 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 1C:7B:21, it is Sony Corporation hardware.
Frequently Asked Questions
Who owns MAC prefix 1C7B21?
1C7B21 is registered to Sony 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. Sony Corporation's block covers 16,777,216 addresses.
What devices use 1C7B21?
Any network device with a MAC address starting 1C:7B:21 was manufactured by or for Sony Corporation.