Who owns MAC prefix 640B4A?

640B4A is registered to Digital Telecom Technology Limited in the IEEE MA-L registry.

What devices use 640B4A?

Any network device with a MAC address starting 64:0B:4A was manufactured by or for Digital Telecom Technology Limited.

MA-L · OUI prefix

Digital Telecom Technology Limited

Any MAC address starting 64:0B:4A is registered to Digital Telecom Technology Limited in US.

OUI prefix	640B4A
Vendor	Digital Telecom Technology Limited
Registry	MA-L (24-bit, large block)
Country	US
Example MAC	64:0B:4A:00:00:00

What this means

The IEEE assigned the MA-L block 640B4A to Digital Telecom Technology Limited. 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 64:0B:4A, it is Digital Telecom Technology Limited hardware.

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