Who owns MAC prefix 00103F?

00103F is registered to TOLLGRADE COMMUNICATIONS, INC. in the IEEE MA-L registry.

What devices use 00103F?

Any network device with a MAC address starting 00:10:3F was manufactured by or for TOLLGRADE COMMUNICATIONS, INC..

MA-L · OUI prefix

TOLLGRADE COMMUNICATIONS, INC.

Any MAC address starting 00:10:3F is registered to TOLLGRADE COMMUNICATIONS, INC. in US.

OUI prefix	00103F
Vendor	TOLLGRADE COMMUNICATIONS, INC.
Registry	MA-L (24-bit, large block)
Country	US
Example MAC	00:10:3F:00:00:00

What this means

The IEEE assigned the MA-L block 00103F to TOLLGRADE COMMUNICATIONS, INC.. 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 00:10:3F, it is TOLLGRADE COMMUNICATIONS, INC. hardware.

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