Who owns MAC prefix 1C4840?

1C4840 is registered to IMS Messsysteme GmbH in the IEEE MA-L registry.

What devices use 1C4840?

Any network device with a MAC address starting 1C:48:40 was manufactured by or for IMS Messsysteme GmbH.

MA-L · OUI prefix

IMS Messsysteme GmbH

Any MAC address starting 1C:48:40 is registered to IMS Messsysteme GmbH in DE.

OUI prefix	1C4840
Vendor	IMS Messsysteme GmbH
Registry	MA-L (24-bit, large block)
Country	DE
Example MAC	1C:48:40:00:00:00

What this means

The IEEE assigned the MA-L block 1C4840 to IMS Messsysteme GmbH. 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:48:40, it is IMS Messsysteme GmbH hardware.

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