Who owns MAC prefix 000503?

000503 is registered to ICONAG in the IEEE MA-L registry.

What devices use 000503?

Any network device with a MAC address starting 00:05:03 was manufactured by or for ICONAG.

MA-L · OUI prefix

ICONAG

Any MAC address starting 00:05:03 is registered to ICONAG in DE.

OUI prefix	000503
Vendor	ICONAG
Registry	MA-L (24-bit, large block)
Country	DE
Example MAC	00:05:03:00:00:00

What this means

The IEEE assigned the MA-L block 000503 to ICONAG. 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 00:05:03, it is ICONAG hardware.

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