Who owns MAC prefix 0040CC?

0040CC is registered to SILCOM MANUF'G TECHNOLOGY INC. in the IEEE MA-L registry.

What devices use 0040CC?

Any network device with a MAC address starting 00:40:CC was manufactured by or for SILCOM MANUF'G TECHNOLOGY INC..

MA-L · OUI prefix

SILCOM MANUF'G TECHNOLOGY INC.

Any MAC address starting 00:40:CC is registered to SILCOM MANUF'G TECHNOLOGY INC. in CA.

OUI prefix	0040CC
Vendor	SILCOM MANUF'G TECHNOLOGY INC.
Registry	MA-L (24-bit, large block)
Country	CA
Example MAC	00:40:CC:00:00:00

What this means

The IEEE assigned the MA-L block 0040CC to SILCOM MANUF'G 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 00:40:CC, it is SILCOM MANUF'G TECHNOLOGY INC. hardware.

Look up another MAC