Who owns MAC prefix 581D91?

581D91 is registered to Advanced Mobile Telecom co.,ltd. in the IEEE MA-L registry.

What devices use 581D91?

Any network device with a MAC address starting 58:1D:91 was manufactured by or for Advanced Mobile Telecom co.,ltd..

MA-L · OUI prefix

Advanced Mobile Telecom co.,ltd.

Any MAC address starting 58:1D:91 is registered to Advanced Mobile Telecom co.,ltd. in KR.

OUI prefix	581D91
Vendor	Advanced Mobile Telecom co.,ltd.
Registry	MA-L (24-bit, large block)
Country	KR
Example MAC	58:1D:91:00:00:00

What this means

The IEEE assigned the MA-L block 581D91 to Advanced Mobile Telecom co.,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 58:1D:91, it is Advanced Mobile Telecom co.,ltd. hardware.

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