Which company owns MAC address prefix 48:6F:33?

MAC address prefix 48:6F:33 is registered to KYUNGWOO.SYSTEM, INC. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 48:6F:33 has a network interface built by KYUNGWOO.SYSTEM, INC..

What is the OUI 48:6F:33?

48:6F:33 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to KYUNGWOO.SYSTEM, INC.. It covers every address from 48:6F:33:00:00:00 to 48:6F:33:FF:FF:FF, or 16,777,216 addresses in total. It is also written 48-6F-33.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 48:6F:33:00:00:00 that is 48:6F:33 — 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 KYUNGWOO.SYSTEM, INC. located?

KYUNGWOO.SYSTEM, INC. is listed at 68, Digital-ro 9-gil, Geumcheon-gu, Seoul, Republic of Korea Seoul KR 08512 in the IEEE OUI registry entry for 48:6F:33. This is the address the organization registered with the IEEE, which may differ from its current operating address.

KYUNGWOO.SYSTEM, INC.

MAC address prefix 48:6F:33 is registered to KYUNGWOO.SYSTEM, INC. in the IEEE OUI registry. Any device whose MAC address begins with 48:6F:33 has a network interface built by KYUNGWOO.SYSTEM, INC.. 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 48:6F:33:00:00:00 to 48:6F:33:FF:FF:FF.

OUI prefix: 48:6F:33
Hyphen form: 48-6F-33
MAC range: 48:6F:33:00:00:00 – 48:6F:33:FF:FF:FF
Addresses in block: 16,777,216
Organization: KYUNGWOO.SYSTEM, INC.
Address: 68, Digital-ro 9-gil, Geumcheon-gu, Seoul, Republic of Korea Seoul KR 08512
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 (1)

The IEEE registry publishes current state only — this is the change record we've kept since we started tracking it daily.

2026-07-17Assigned to "KYUNGWOO.SYSTEM, INC."

Nearby in the registry

The prefixes assigned immediately before and after 48:6F:33:

FAQ

Which company owns MAC address prefix 48:6F:33?: MAC address prefix 48:6F:33 is registered to KYUNGWOO.SYSTEM, INC. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 48:6F:33 has a network interface built by KYUNGWOO.SYSTEM, INC..
What is the OUI 48:6F:33?: 48:6F:33 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to KYUNGWOO.SYSTEM, INC.. It covers every address from 48:6F:33:00:00:00 to 48:6F:33:FF:FF:FF, or 16,777,216 addresses in total. It is also written 48-6F-33.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 48:6F:33:00:00:00 that is 48:6F:33 — 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 KYUNGWOO.SYSTEM, INC. located?: KYUNGWOO.SYSTEM, INC. is listed at 68, Digital-ro 9-gil, Geumcheon-gu, Seoul, Republic of Korea Seoul KR 08512 in the IEEE OUI registry entry for 48:6F:33. This is the address the organization registered with the IEEE, which may differ from its current operating address.