What this means
The IEEE assigned the MA-M block 38F7CD3 to VANGUARD. 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 38:F7:CD:3, it is VANGUARD hardware.
Frequently Asked Questions
Who owns MAC prefix 38F7CD3?
38F7CD3 is registered to VANGUARD in the IEEE MA-M registry.
What does the MA-M registry type mean?
An MA-M assignment covers 28 bits of the address, giving the vendor 1,048,576 device addresses, a quarter of a full MA-L block. VANGUARD's block covers 1,048,576 addresses.
What devices use 38F7CD3?
Any network device with a MAC address starting 38:F7:CD:3 was manufactured by or for VANGUARD.