Which company owns MAC address prefix 40:DF:02?

MAC address prefix 40:DF:02 is registered to LINE BIZ Plus in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 40:DF:02 has a network interface built by LINE BIZ Plus.

What is the OUI 40:DF:02?

40:DF:02 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to LINE BIZ Plus. It covers every address from 40:DF:02:00:00:00 to 40:DF:02:FF:FF:FF, or 16,777,216 addresses in total. It is also written 40-DF-02.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 40:DF:02:00:00:00 that is 40:DF:02 — 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 LINE BIZ Plus located?

LINE BIZ Plus is listed at Alphadom Tower IV (6F), Bundangnaegok-ro 117, Bundang-gu Seongnam Gyeonggi KR 13529 in the IEEE OUI registry entry for 40:DF:02. This is the address the organization registered with the IEEE, which may differ from its current operating address.

LINE BIZ Plus

MAC address prefix 40:DF:02 is registered to LINE BIZ Plus in the IEEE OUI registry. Any device whose MAC address begins with 40:DF:02 has a network interface built by LINE BIZ Plus. 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 40:DF:02:00:00:00 to 40:DF:02:FF:FF:FF.

OUI prefix: 40:DF:02
Hyphen form: 40-DF-02
MAC range: 40:DF:02:00:00:00 – 40:DF:02:FF:FF:FF
Addresses in block: 16,777,216
Organization: LINE BIZ Plus
Address: Alphadom Tower IV (6F), Bundangnaegok-ro 117, Bundang-gu Seongnam Gyeonggi KR 13529
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 "LINE BIZ Plus"
archived source →
2026-07-17Assigned to "LINE BIZ Plus"

Nearby in the registry

The prefixes assigned immediately before and after 40:DF:02:

FAQ

Which company owns MAC address prefix 40:DF:02?: MAC address prefix 40:DF:02 is registered to LINE BIZ Plus in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 40:DF:02 has a network interface built by LINE BIZ Plus.
What is the OUI 40:DF:02?: 40:DF:02 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to LINE BIZ Plus. It covers every address from 40:DF:02:00:00:00 to 40:DF:02:FF:FF:FF, or 16,777,216 addresses in total. It is also written 40-DF-02.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 40:DF:02:00:00:00 that is 40:DF:02 — 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 LINE BIZ Plus located?: LINE BIZ Plus is listed at Alphadom Tower IV (6F), Bundangnaegok-ro 117, Bundang-gu Seongnam Gyeonggi KR 13529 in the IEEE OUI registry entry for 40:DF:02. This is the address the organization registered with the IEEE, which may differ from its current operating address.