Who owns MAC prefix 70B3D554F?

70B3D554F is registered to Assembly Contracts Limited in the IEEE MA-S registry.

What devices use 70B3D554F?

Any network device with a MAC address starting 70:B3:D5:54:F was manufactured by or for Assembly Contracts Limited.

MA-S · OUI prefix

Assembly Contracts Limited

Any MAC address starting 70:B3:D5:54:F is registered to Assembly Contracts Limited.

OUI prefix	70B3D554F
Vendor	Assembly Contracts Limited
Registry	MA-S (36-bit, small block)
Example MAC	70:B3:D5:54:F:00:00:00

What this means

The IEEE assigned the MA-S block 70B3D554F to Assembly Contracts 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 70:B3:D5:54:F, it is Assembly Contracts Limited hardware.

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