What this means
The IEEE assigned the MA-M block 801D0D4 to GTL Tecnologia e Sistemas Ltda. 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 80:1D:0D:4, it is GTL Tecnologia e Sistemas Ltda hardware.
Frequently Asked Questions
Who owns MAC prefix 801D0D4?
801D0D4 is registered to GTL Tecnologia e Sistemas Ltda in the IEEE MA-M registry.
What does the MA-M registry type mean?
An MA-M assignment covers 28 bits of the address, giving the vendor 1,048,576 device addresses, a quarter of a full MA-L block. GTL Tecnologia e Sistemas Ltda's block covers 1,048,576 addresses.
What devices use 801D0D4?
Any network device with a MAC address starting 80:1D:0D:4 was manufactured by or for GTL Tecnologia e Sistemas Ltda.