What this means
The IEEE assigned the MA-L block 70A8A5 to Microsoft 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 70:A8:A5, it is Microsoft Corporation hardware.
Frequently Asked Questions
Who owns MAC prefix 70A8A5?
70A8A5 is registered to Microsoft 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. Microsoft Corporation's block covers 16,777,216 addresses.
What devices use 70A8A5?
Any network device with a MAC address starting 70:A8:A5 was manufactured by or for Microsoft Corporation.