Which company owns MAC address prefix 58:1D:91?

MAC address prefix 58:1D:91 is registered to Advanced Mobile Telecom co.,ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 58:1D:91 has a network interface built by Advanced Mobile Telecom co.,ltd..

What is the OUI 58:1D:91?

58:1D:91 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Advanced Mobile Telecom co.,ltd.. It covers every address from 58:1D:91:00:00:00 to 58:1D:91:FF:FF:FF, or 16,777,216 addresses in total. It is also written 58-1D-91.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 58:1D:91:00:00:00 that is 58:1D:91 — and look that prefix up in the IEEE OUI registry. If the second-lowest bit of the first octet is set, the address is locally administered (a randomized or private MAC), which belongs to no manufacturer and will not resolve; modern phones and laptops use these by default on each network.

Where is Advanced Mobile Telecom co.,ltd. located?

Advanced Mobile Telecom co.,ltd. is listed at #608, Yatap Leaders Bldg. 342-1 Seongnam-si Gyeonggi-do KR 463-828 in the IEEE OUI registry entry for 58:1D:91. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Advanced Mobile Telecom co.,ltd.

MAC address prefix 58:1D:91 is registered to Advanced Mobile Telecom co.,ltd. in the IEEE OUI registry. Any device whose MAC address begins with 58:1D:91 has a network interface built by Advanced Mobile Telecom co.,ltd.. This prefix (the OUI, or Organizationally Unique Identifier) is assigned by the IEEE and is the first three octets of the address — it covers every MAC from 58:1D:91:00:00:00 to 58:1D:91:FF:FF:FF.

OUI prefix: 58:1D:91
Hyphen form: 58-1D-91
MAC range: 58:1D:91:00:00:00 – 58:1D:91:FF:FF:FF
Addresses in block: 16,777,216
Organization: Advanced Mobile Telecom co.,ltd.
Address: #608, Yatap Leaders Bldg. 342-1 Seongnam-si Gyeonggi-do KR 463-828
Source: IEEE OUI registry

Have a full MAC address? Look it up— we'll also tell you if it's a randomized (private) address rather than a real manufacturer prefix.

Assignment history (2)

The IEEE registry publishes current state only — this is the change record we've kept since we started tracking it daily.

2016-07-29Assigned to "Advanced Mobile Telecom co.,ltd."
archived source →
2026-07-17Assigned to "Advanced Mobile Telecom co.,ltd."

Nearby in the registry

The prefixes assigned immediately before and after 58:1D:91:

FAQ

Which company owns MAC address prefix 58:1D:91?: MAC address prefix 58:1D:91 is registered to Advanced Mobile Telecom co.,ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 58:1D:91 has a network interface built by Advanced Mobile Telecom co.,ltd..
What is the OUI 58:1D:91?: 58:1D:91 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Advanced Mobile Telecom co.,ltd.. It covers every address from 58:1D:91:00:00:00 to 58:1D:91:FF:FF:FF, or 16,777,216 addresses in total. It is also written 58-1D-91.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 58:1D:91:00:00:00 that is 58:1D:91 — and look that prefix up in the IEEE OUI registry. If the second-lowest bit of the first octet is set, the address is locally administered (a randomized or private MAC), which belongs to no manufacturer and will not resolve; modern phones and laptops use these by default on each network.
Where is Advanced Mobile Telecom co.,ltd. located?: Advanced Mobile Telecom co.,ltd. is listed at #608, Yatap Leaders Bldg. 342-1 Seongnam-si Gyeonggi-do KR 463-828 in the IEEE OUI registry entry for 58:1D:91. This is the address the organization registered with the IEEE, which may differ from its current operating address.