Who owns MAC prefix 00C05A?

00C05A is registered to SEMAPHORE COMMUNICATIONS CORP. in the IEEE MA-L registry.

What devices use 00C05A?

Any network device with a MAC address starting 00:C0:5A was manufactured by or for SEMAPHORE COMMUNICATIONS CORP..

MA-L · OUI prefix

SEMAPHORE COMMUNICATIONS CORP.

Any MAC address starting 00:C0:5A is registered to SEMAPHORE COMMUNICATIONS CORP. in US.

OUI prefix	00C05A
Vendor	SEMAPHORE COMMUNICATIONS CORP.
Registry	MA-L (24-bit, large block)
Country	US
Example MAC	00:C0:5A:00:00:00

What this means

The IEEE assigned the MA-L block 00C05A to SEMAPHORE COMMUNICATIONS CORP.. 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:C0:5A, it is SEMAPHORE COMMUNICATIONS CORP. hardware.

Look up another MAC