Which company owns MAC address prefix 00:0C:FB?

MAC address prefix 00:0C:FB is registered to Korea Network Systems in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 00:0C:FB has a network interface built by Korea Network Systems.

What is the OUI 00:0C:FB?

00:0C:FB is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Korea Network Systems. It covers every address from 00:0C:FB:00:00:00 to 00:0C:FB:FF:FF:FF, or 16,777,216 addresses in total. It is also written 00-0C-FB.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 00:0C:FB:00:00:00 that is 00:0C:FB — 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 Korea Network Systems located?

Korea Network Systems is listed at 206 JangYoungSil Bldg, 1688-5 Taejeon KR 306-230 in the IEEE OUI registry entry for 00:0C:FB. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Korea Network Systems

MAC address prefix 00:0C:FB is registered to Korea Network Systems in the IEEE OUI registry. Any device whose MAC address begins with 00:0C:FB has a network interface built by Korea Network Systems. 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 00:0C:FB:00:00:00 to 00:0C:FB:FF:FF:FF.

OUI prefix: 00:0C:FB
Hyphen form: 00-0C-FB
MAC range: 00:0C:FB:00:00:00 – 00:0C:FB:FF:FF:FF
Addresses in block: 16,777,216
Organization: Korea Network Systems
Address: 206 JangYoungSil Bldg, 1688-5 Taejeon KR 306-230
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 "Korea Network Systems"
archived source →
2026-07-17Assigned to "Korea Network Systems"

Nearby in the registry

The prefixes assigned immediately before and after 00:0C:FB:

FAQ

Which company owns MAC address prefix 00:0C:FB?: MAC address prefix 00:0C:FB is registered to Korea Network Systems in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 00:0C:FB has a network interface built by Korea Network Systems.
What is the OUI 00:0C:FB?: 00:0C:FB is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Korea Network Systems. It covers every address from 00:0C:FB:00:00:00 to 00:0C:FB:FF:FF:FF, or 16,777,216 addresses in total. It is also written 00-0C-FB.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 00:0C:FB:00:00:00 that is 00:0C:FB — 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 Korea Network Systems located?: Korea Network Systems is listed at 206 JangYoungSil Bldg, 1688-5 Taejeon KR 306-230 in the IEEE OUI registry entry for 00:0C:FB. This is the address the organization registered with the IEEE, which may differ from its current operating address.