Who owns MAC prefix 70B3D5E77?

70B3D5E77 is registered to OPTIX JSC in the IEEE MA-S registry.

What devices use 70B3D5E77?

Any network device with a MAC address starting 70:B3:D5:E7:7 was manufactured by or for OPTIX JSC.

MA-S · OUI prefix

OPTIX JSC

Any MAC address starting 70:B3:D5:E7:7 is registered to OPTIX JSC in BG.

OUI prefix	70B3D5E77
Vendor	OPTIX JSC
Registry	MA-S (36-bit, small block)
Country	BG
Example MAC	70:B3:D5:E7:7:00:00:00

What this means

The IEEE assigned the MA-S block 70B3D5E77 to OPTIX JSC. 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:E7:7, it is OPTIX JSC hardware.

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