Which company owns MAC address prefix 90:8F:CF?

MAC address prefix 90:8F:CF is registered to UNO System Co., Ltd in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 90:8F:CF has a network interface built by UNO System Co., Ltd.

What is the OUI 90:8F:CF?

90:8F:CF is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to UNO System Co., Ltd. It covers every address from 90:8F:CF:00:00:00 to 90:8F:CF:FF:FF:FF, or 16,777,216 addresses in total. It is also written 90-8F-CF.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 90:8F:CF:00:00:00 that is 90:8F:CF — 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 UNO System Co., Ltd located?

UNO System Co., Ltd is listed at #402 Kolon Science Valley °., 187-10, Guro-dong, Guro-gu Seoul KR 152-848 in the IEEE OUI registry entry for 90:8F:CF. This is the address the organization registered with the IEEE, which may differ from its current operating address.

UNO System Co., Ltd

MAC address prefix 90:8F:CF is registered to UNO System Co., Ltd in the IEEE OUI registry. Any device whose MAC address begins with 90:8F:CF has a network interface built by UNO 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 90:8F:CF:00:00:00 to 90:8F:CF:FF:FF:FF.

OUI prefix: 90:8F:CF
Hyphen form: 90-8F-CF
MAC range: 90:8F:CF:00:00:00 – 90:8F:CF:FF:FF:FF
Addresses in block: 16,777,216
Organization: UNO System Co., Ltd
Address: #402 Kolon Science Valley °., 187-10, Guro-dong, Guro-gu Seoul KR 152-848
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 "UNO System Co., Ltd"
archived source →
2026-07-17Assigned to "UNO System Co., Ltd"

Nearby in the registry

The prefixes assigned immediately before and after 90:8F:CF:

FAQ

Which company owns MAC address prefix 90:8F:CF?: MAC address prefix 90:8F:CF is registered to UNO System Co., Ltd in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 90:8F:CF has a network interface built by UNO System Co., Ltd.
What is the OUI 90:8F:CF?: 90:8F:CF is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to UNO System Co., Ltd. It covers every address from 90:8F:CF:00:00:00 to 90:8F:CF:FF:FF:FF, or 16,777,216 addresses in total. It is also written 90-8F-CF.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 90:8F:CF:00:00:00 that is 90:8F:CF — 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 UNO System Co., Ltd located?: UNO System Co., Ltd is listed at #402 Kolon Science Valley °., 187-10, Guro-dong, Guro-gu Seoul KR 152-848 in the IEEE OUI registry entry for 90:8F:CF. This is the address the organization registered with the IEEE, which may differ from its current operating address.