Who owns MAC prefix 001AC1?

001AC1 is registered to 3Com Ltd in the IEEE MA-L registry.

What devices use 001AC1?

Any network device with a MAC address starting 00:1A:C1 was manufactured by or for 3Com Ltd.

MA-L · OUI prefix

3Com Ltd

Any MAC address starting 00:1A:C1 is registered to 3Com Ltd.

OUI prefix	001AC1
Vendor	3Com Ltd
Registry	MA-L (24-bit, large block)
Example MAC	00:1A:C1:00:00:00

What this means

The IEEE assigned the MA-L block 001AC1 to 3Com Ltd. 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 00:1A:C1, it is 3Com Ltd hardware.

Other 3Com Ltd prefixes

3Com Ltd holds 11 registered blocks in total.

000A04 000BAC 000D54 000E6A 000FCB 0012A9 00147C 0016E0 00186E 001CC5

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