Amazon Technologies Inc. - MAC Prefix 4CEFC0 (MA-L)

What this means

The IEEE assigned the MA-L block 4CEFC0 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 4C:EF:C0, it is Amazon Technologies Inc. hardware.

Frequently Asked Questions

Who owns MAC prefix 4CEFC0?

4CEFC0 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 4CEFC0?

Any network device with a MAC address starting 4C:EF:C0 was manufactured by or for Amazon Technologies Inc..

Other Amazon Technologies Inc. prefixes

Amazon Technologies Inc. holds 206 registered blocks in total.

OUI prefix	4CEFC0
Vendor	Amazon Technologies Inc.
Registry	MA-L (24-bit, large block)
Block size	16,777,216 addresses
Country	US
Other blocks by this vendor	206 total
Example MAC	4C:EF:C0:00:00:00