Which company owns MAC address prefix 80:B9:5C?

MAC address prefix 80:B9:5C is registered to ELFTECH Co., Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 80:B9:5C has a network interface built by ELFTECH Co., Ltd..

What is the OUI 80:B9:5C?

80:B9:5C is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to ELFTECH Co., Ltd.. It covers every address from 80:B9:5C:00:00:00 to 80:B9:5C:FF:FF:FF, or 16,777,216 addresses in total. It is also written 80-B9-5C.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 80:B9:5C:00:00:00 that is 80:B9:5C — 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 ELFTECH Co., Ltd. located?

ELFTECH Co., Ltd. is listed at 174, Daehyeon Techno World 6F 609, Uiwang-Si Gyeonggi-Do KR 437-753 in the IEEE OUI registry entry for 80:B9:5C. This is the address the organization registered with the IEEE, which may differ from its current operating address.

ELFTECH Co., Ltd.

MAC address prefix 80:B9:5C is registered to ELFTECH Co., Ltd. in the IEEE OUI registry. Any device whose MAC address begins with 80:B9:5C has a network interface built by ELFTECH 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 80:B9:5C:00:00:00 to 80:B9:5C:FF:FF:FF.

OUI prefix: 80:B9:5C
Hyphen form: 80-B9-5C
MAC range: 80:B9:5C:00:00:00 – 80:B9:5C:FF:FF:FF
Addresses in block: 16,777,216
Organization: ELFTECH Co., Ltd.
Address: 174, Daehyeon Techno World 6F 609, Uiwang-Si Gyeonggi-Do KR 437-753
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 "ELFTECH Co., Ltd."
archived source →
2026-07-17Assigned to "ELFTECH Co., Ltd."

Nearby in the registry

The prefixes assigned immediately before and after 80:B9:5C:

FAQ

Which company owns MAC address prefix 80:B9:5C?: MAC address prefix 80:B9:5C is registered to ELFTECH Co., Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 80:B9:5C has a network interface built by ELFTECH Co., Ltd..
What is the OUI 80:B9:5C?: 80:B9:5C is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to ELFTECH Co., Ltd.. It covers every address from 80:B9:5C:00:00:00 to 80:B9:5C:FF:FF:FF, or 16,777,216 addresses in total. It is also written 80-B9-5C.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 80:B9:5C:00:00:00 that is 80:B9:5C — 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 ELFTECH Co., Ltd. located?: ELFTECH Co., Ltd. is listed at 174, Daehyeon Techno World 6F 609, Uiwang-Si Gyeonggi-Do KR 437-753 in the IEEE OUI registry entry for 80:B9:5C. This is the address the organization registered with the IEEE, which may differ from its current operating address.