Which company owns MAC address prefix A0:72:E4?

MAC address prefix A0:72:E4 is registered to NJ SYSTEM CO.,LTD in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with A0:72:E4 has a network interface built by NJ SYSTEM CO.,LTD.

What is the OUI A0:72:E4?

A0:72:E4 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to NJ SYSTEM CO.,LTD. It covers every address from A0:72:E4:00:00:00 to A0:72:E4:FF:FF:FF, or 16,777,216 addresses in total. It is also written A0-72-E4.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in A0:72:E4:00:00:00 that is A0:72:E4 — 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 NJ SYSTEM CO.,LTD located?

NJ SYSTEM CO.,LTD is listed at Urim lions valley 5cha, A-1701, 144-3, Sangdaewon-dong, Jungwon-gu Seongnam Gyeonggido KR 13201 in the IEEE OUI registry entry for A0:72:E4. This is the address the organization registered with the IEEE, which may differ from its current operating address.

NJ SYSTEM CO.,LTD

MAC address prefix A0:72:E4 is registered to NJ SYSTEM CO.,LTD in the IEEE OUI registry. Any device whose MAC address begins with A0:72:E4 has a network interface built by NJ SYSTEM 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 A0:72:E4:00:00:00 to A0:72:E4:FF:FF:FF.

OUI prefix: A0:72:E4
Hyphen form: A0-72-E4
MAC range: A0:72:E4:00:00:00 – A0:72:E4:FF:FF:FF
Addresses in block: 16,777,216
Organization: NJ SYSTEM CO.,LTD
Address: Urim lions valley 5cha, A-1701, 144-3, Sangdaewon-dong, Jungwon-gu Seongnam Gyeonggido KR 13201
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.

2017-09-08Assigned to "NJ SYSTEM CO.,LTD"
archived source →
2026-07-17Assigned to "NJ SYSTEM CO.,LTD"

Nearby in the registry

The prefixes assigned immediately before and after A0:72:E4:

FAQ

Which company owns MAC address prefix A0:72:E4?: MAC address prefix A0:72:E4 is registered to NJ SYSTEM CO.,LTD in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with A0:72:E4 has a network interface built by NJ SYSTEM CO.,LTD.
What is the OUI A0:72:E4?: A0:72:E4 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to NJ SYSTEM CO.,LTD. It covers every address from A0:72:E4:00:00:00 to A0:72:E4:FF:FF:FF, or 16,777,216 addresses in total. It is also written A0-72-E4.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in A0:72:E4:00:00:00 that is A0:72:E4 — 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 NJ SYSTEM CO.,LTD located?: NJ SYSTEM CO.,LTD is listed at Urim lions valley 5cha, A-1701, 144-3, Sangdaewon-dong, Jungwon-gu Seongnam Gyeonggido KR 13201 in the IEEE OUI registry entry for A0:72:E4. This is the address the organization registered with the IEEE, which may differ from its current operating address.