Who owns MAC prefix 0004B1?

0004B1 is registered to Signal Technology, Inc. in the IEEE MA-L registry.

What devices use 0004B1?

Any network device with a MAC address starting 00:04:B1 was manufactured by or for Signal Technology, Inc..

MA-L · OUI prefix

Signal Technology, Inc.

Any MAC address starting 00:04:B1 is registered to Signal Technology, Inc. in KR.

OUI prefix	0004B1
Vendor	Signal Technology, Inc.
Registry	MA-L (24-bit, large block)
Country	KR
Example MAC	00:04:B1:00:00:00

What this means

The IEEE assigned the MA-L block 0004B1 to Signal Technology, 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 00:04:B1, it is Signal Technology, Inc. hardware.

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