What this means
The IEEE assigned the MA-L block 40B4CD to Amazon Technologies 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 40:B4:CD, it is Amazon Technologies Inc. hardware.
Frequently Asked Questions
Who owns MAC prefix 40B4CD?
40B4CD is registered to Amazon Technologies 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. Amazon Technologies Inc.'s block covers 16,777,216 addresses.
What devices use 40B4CD?
Any network device with a MAC address starting 40:B4:CD was manufactured by or for Amazon Technologies Inc..