Which company owns MAC address prefix 18:A2:8A?

MAC address prefix 18:A2:8A is registered to Essel-T Co., Ltd in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 18:A2:8A has a network interface built by Essel-T Co., Ltd.

What is the OUI 18:A2:8A?

18:A2:8A is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Essel-T Co., Ltd. It covers every address from 18:A2:8A:00:00:00 to 18:A2:8A:FF:FF:FF, or 16,777,216 addresses in total. It is also written 18-A2-8A.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 18:A2:8A:00:00:00 that is 18:A2:8A — 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 Essel-T Co., Ltd located?

Essel-T Co., Ltd is listed at 1211 kranztechno, 388 Dunchon-daero Seongnam-si Jungwon-gu, Gyeonggi-do KR 13403 in the IEEE OUI registry entry for 18:A2:8A. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Essel-T Co., Ltd

MAC address prefix 18:A2:8A is registered to Essel-T Co., Ltd in the IEEE OUI registry. Any device whose MAC address begins with 18:A2:8A has a network interface built by Essel-T 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 18:A2:8A:00:00:00 to 18:A2:8A:FF:FF:FF.

OUI prefix: 18:A2:8A
Hyphen form: 18-A2-8A
MAC range: 18:A2:8A:00:00:00 – 18:A2:8A:FF:FF:FF
Addresses in block: 16,777,216
Organization: Essel-T Co., Ltd
Address: 1211 kranztechno, 388 Dunchon-daero Seongnam-si Jungwon-gu, Gyeonggi-do KR 13403
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.

2018-12-21Assigned to "Essel-T Co., Ltd"
archived source →
2026-07-17Assigned to "Essel-T Co., Ltd"

Nearby in the registry

The prefixes assigned immediately before and after 18:A2:8A:

FAQ

Which company owns MAC address prefix 18:A2:8A?: MAC address prefix 18:A2:8A is registered to Essel-T Co., Ltd in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 18:A2:8A has a network interface built by Essel-T Co., Ltd.
What is the OUI 18:A2:8A?: 18:A2:8A is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Essel-T Co., Ltd. It covers every address from 18:A2:8A:00:00:00 to 18:A2:8A:FF:FF:FF, or 16,777,216 addresses in total. It is also written 18-A2-8A.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 18:A2:8A:00:00:00 that is 18:A2:8A — 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 Essel-T Co., Ltd located?: Essel-T Co., Ltd is listed at 1211 kranztechno, 388 Dunchon-daero Seongnam-si Jungwon-gu, Gyeonggi-do KR 13403 in the IEEE OUI registry entry for 18:A2:8A. This is the address the organization registered with the IEEE, which may differ from its current operating address.