Who owns MAC prefix 803A59?

803A59 is registered to AT&T in the IEEE MA-L registry.

What devices use 803A59?

Any network device with a MAC address starting 80:3A:59 was manufactured by or for AT&T.

MA-L · OUI prefix

AT&T

Any MAC address starting 80:3A:59 is registered to AT&T in US.

OUI prefix	803A59
Vendor	AT&T
Registry	MA-L (24-bit, large block)
Country	US
Example MAC	80:3A:59:00:00:00

What this means

The IEEE assigned the MA-L block 803A59 to AT&T. 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 80:3A:59, it is AT&T hardware.

Other AT&T prefixes

AT&T holds 6 registered blocks in total.

00071C 0060D3 08006A 800010 D093952

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