Which company owns MAC address prefix A4:5F:9B?

MAC address prefix A4:5F:9B is registered to Nexell in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with A4:5F:9B has a network interface built by Nexell.

What is the OUI A4:5F:9B?

A4:5F:9B is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Nexell. It covers every address from A4:5F:9B:00:00:00 to A4:5F:9B:FF:FF:FF, or 16,777,216 addresses in total. It is also written A4-5F-9B.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in A4:5F:9B:00:00:00 that is A4:5F:9B — 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 Nexell located?

Nexell is listed at 12F, 31 Hwangsaeul-ro 258 beon-gil, Bundang-gu Seongnam-si, Gyeonggi-do KR 13595 in the IEEE OUI registry entry for A4:5F:9B. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Nexell

MAC address prefix A4:5F:9B is registered to Nexell in the IEEE OUI registry. Any device whose MAC address begins with A4:5F:9B has a network interface built by Nexell. 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 A4:5F:9B:00:00:00 to A4:5F:9B:FF:FF:FF.

OUI prefix: A4:5F:9B
Hyphen form: A4-5F-9B
MAC range: A4:5F:9B:00:00:00 – A4:5F:9B:FF:FF:FF
Addresses in block: 16,777,216
Organization: Nexell
Address: 12F, 31 Hwangsaeul-ro 258 beon-gil, Bundang-gu Seongnam-si, Gyeonggi-do KR 13595
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 "Nexell"
archived source →
2026-07-17Assigned to "Nexell"

Nearby in the registry

The prefixes assigned immediately before and after A4:5F:9B:

FAQ

Which company owns MAC address prefix A4:5F:9B?: MAC address prefix A4:5F:9B is registered to Nexell in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with A4:5F:9B has a network interface built by Nexell.
What is the OUI A4:5F:9B?: A4:5F:9B is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Nexell. It covers every address from A4:5F:9B:00:00:00 to A4:5F:9B:FF:FF:FF, or 16,777,216 addresses in total. It is also written A4-5F-9B.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in A4:5F:9B:00:00:00 that is A4:5F:9B — 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 Nexell located?: Nexell is listed at 12F, 31 Hwangsaeul-ro 258 beon-gil, Bundang-gu Seongnam-si, Gyeonggi-do KR 13595 in the IEEE OUI registry entry for A4:5F:9B. This is the address the organization registered with the IEEE, which may differ from its current operating address.