Who owns MAC prefix 1CB243?

1CB243 is registered to TDC A/S in the IEEE MA-L registry.

What devices use 1CB243?

Any network device with a MAC address starting 1C:B2:43 was manufactured by or for TDC A/S.

MA-L · OUI prefix

TDC A/S

Any MAC address starting 1C:B2:43 is registered to TDC A/S in DK.

OUI prefix	1CB243
Vendor	TDC A/S
Registry	MA-L (24-bit, large block)
Country	DK
Example MAC	1C:B2:43:00:00:00

What this means

The IEEE assigned the MA-L block 1CB243 to TDC A/S. 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 1C:B2:43, it is TDC A/S hardware.

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