What this means
The IEEE assigned the MA-L block 001C5B to Chubb Electronic Security Systems Ltd. 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 00:1C:5B, it is Chubb Electronic Security Systems Ltd hardware.
Frequently Asked Questions
Who owns MAC prefix 001C5B?
001C5B is registered to Chubb Electronic Security Systems Ltd 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. Chubb Electronic Security Systems Ltd's block covers 16,777,216 addresses.
What devices use 001C5B?
Any network device with a MAC address starting 00:1C:5B was manufactured by or for Chubb Electronic Security Systems Ltd.