Which company owns MAC address prefix D0:CE:C9?

MAC address prefix D0:CE:C9 is registered to HAN CHANG in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with D0:CE:C9 has a network interface built by HAN CHANG.

What is the OUI D0:CE:C9?

D0:CE:C9 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to HAN CHANG. It covers every address from D0:CE:C9:00:00:00 to D0:CE:C9:FF:FF:FF, or 16,777,216 addresses in total. It is also written D0-CE-C9.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in D0:CE:C9:00:00:00 that is D0:CE:C9 — 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 HAN CHANG located?

HAN CHANG is listed at 171, Gasan digital 1-ro, Geumcheon-gu, Seoul, Republic of Korea Seoul Geumcheon-gu, Seoul KR 08503 in the IEEE OUI registry entry for D0:CE:C9. This is the address the organization registered with the IEEE, which may differ from its current operating address.

HAN CHANG

MAC address prefix D0:CE:C9 is registered to HAN CHANG in the IEEE OUI registry. Any device whose MAC address begins with D0:CE:C9 has a network interface built by HAN CHANG. 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 D0:CE:C9:00:00:00 to D0:CE:C9:FF:FF:FF.

OUI prefix: D0:CE:C9
Hyphen form: D0-CE-C9
MAC range: D0:CE:C9:00:00:00 – D0:CE:C9:FF:FF:FF
Addresses in block: 16,777,216
Organization: HAN CHANG
Address: 171, Gasan digital 1-ro, Geumcheon-gu, Seoul, Republic of Korea Seoul Geumcheon-gu, Seoul KR 08503
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.

2023-07-11Assigned to "HAN CHANG"
archived source →
2026-07-17Assigned to "HAN CHANG"

Nearby in the registry

The prefixes assigned immediately before and after D0:CE:C9:

FAQ

Which company owns MAC address prefix D0:CE:C9?: MAC address prefix D0:CE:C9 is registered to HAN CHANG in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with D0:CE:C9 has a network interface built by HAN CHANG.
What is the OUI D0:CE:C9?: D0:CE:C9 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to HAN CHANG. It covers every address from D0:CE:C9:00:00:00 to D0:CE:C9:FF:FF:FF, or 16,777,216 addresses in total. It is also written D0-CE-C9.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in D0:CE:C9:00:00:00 that is D0:CE:C9 — 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 HAN CHANG located?: HAN CHANG is listed at 171, Gasan digital 1-ro, Geumcheon-gu, Seoul, Republic of Korea Seoul Geumcheon-gu, Seoul KR 08503 in the IEEE OUI registry entry for D0:CE:C9. This is the address the organization registered with the IEEE, which may differ from its current operating address.