Which company owns MAC address prefix DC:D3:21?

MAC address prefix DC:D3:21 is registered to HUMAX Co., Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with DC:D3:21 has a network interface built by HUMAX Co., Ltd..

What is the OUI DC:D3:21?

DC:D3:21 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to HUMAX Co., Ltd.. It covers every address from DC:D3:21:00:00:00 to DC:D3:21:FF:FF:FF, or 16,777,216 addresses in total. It is also written DC-D3-21.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in DC:D3:21:00:00:00 that is DC:D3:21 — 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 HUMAX Co., Ltd. located?

HUMAX Co., Ltd. is listed at HUMAX Village, 11-4, Sunae-dong, Bundang-gu Seongnam-si Gyeonggi-do KR 463-825 in the IEEE OUI registry entry for DC:D3:21. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does HUMAX Co., Ltd. own?

HUMAX Co., Ltd. holds 31 OUI prefixes in the IEEE registry, of which DC:D3:21 is one. A device made by HUMAX Co., Ltd. could carry a MAC address from any of them.

HUMAX Co., Ltd.

MAC address prefix DC:D3:21 is registered to HUMAX Co., Ltd. in the IEEE OUI registry. Any device whose MAC address begins with DC:D3:21 has a network interface built by HUMAX 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 DC:D3:21:00:00:00 to DC:D3:21:FF:FF:FF.

OUI prefix: DC:D3:21
Hyphen form: DC-D3-21
MAC range: DC:D3:21:00:00:00 – DC:D3:21:FF:FF:FF
Addresses in block: 16,777,216
Organization: HUMAX Co., Ltd.
Address: HUMAX Village, 11-4, Sunae-dong, Bundang-gu Seongnam-si Gyeonggi-do KR 463-825
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.

Other prefixes from HUMAX Co., Ltd.

HUMAX Co., Ltd. holds 31 OUI prefixes in total. A device with this exact prefix could just as well carry any of these:

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 "HUMAX Co., Ltd."
archived source →
2026-07-17Assigned to "HUMAX Co., Ltd."

Nearby in the registry

The prefixes assigned immediately before and after DC:D3:21:

FAQ

Which company owns MAC address prefix DC:D3:21?: MAC address prefix DC:D3:21 is registered to HUMAX Co., Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with DC:D3:21 has a network interface built by HUMAX Co., Ltd..
What is the OUI DC:D3:21?: DC:D3:21 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to HUMAX Co., Ltd.. It covers every address from DC:D3:21:00:00:00 to DC:D3:21:FF:FF:FF, or 16,777,216 addresses in total. It is also written DC-D3-21.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in DC:D3:21:00:00:00 that is DC:D3:21 — 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 HUMAX Co., Ltd. located?: HUMAX Co., Ltd. is listed at HUMAX Village, 11-4, Sunae-dong, Bundang-gu Seongnam-si Gyeonggi-do KR 463-825 in the IEEE OUI registry entry for DC:D3:21. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does HUMAX Co., Ltd. own?: HUMAX Co., Ltd. holds 31 OUI prefixes in the IEEE registry, of which DC:D3:21 is one. A device made by HUMAX Co., Ltd. could carry a MAC address from any of them.