What this means
The IEEE assigned the MA-L block 00053D to Agere Systems. 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 00:05:3D, it is Agere Systems hardware.
Frequently Asked Questions
Who owns MAC prefix 00053D?
00053D is registered to Agere Systems 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. Agere Systems's block covers 16,777,216 addresses.
What devices use 00053D?
Any network device with a MAC address starting 00:05:3D was manufactured by or for Agere Systems.