Who owns MAC prefix 70B3D5CBB?

70B3D5CBB is registered to Postmark Incorporated in the IEEE MA-S registry.

What devices use 70B3D5CBB?

Any network device with a MAC address starting 70:B3:D5:CB:B was manufactured by or for Postmark Incorporated.

MA-S · OUI prefix

Postmark Incorporated

Any MAC address starting 70:B3:D5:CB:B is registered to Postmark Incorporated in US.

OUI prefix	70B3D5CBB
Vendor	Postmark Incorporated
Registry	MA-S (36-bit, small block)
Country	US
Example MAC	70:B3:D5:CB:B:00:00:00

What this means

The IEEE assigned the MA-S block 70B3D5CBB to Postmark Incorporated. 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:B3:D5:CB:B, it is Postmark Incorporated hardware.

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