Which company owns MAC address prefix DC:28:34?

MAC address prefix DC:28:34 is registered to HAKKO Corporation in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with DC:28:34 has a network interface built by HAKKO Corporation.

What is the OUI DC:28:34?

DC:28:34 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to HAKKO Corporation. It covers every address from DC:28:34:00:00:00 to DC:28:34:FF:FF:FF, or 16,777,216 addresses in total. It is also written DC-28-34.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in DC:28:34:00:00:00 that is DC:28:34 — 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 HAKKO Corporation located?

HAKKO Corporation is listed at 4-5, Shiokusa 2-chome, Naniwaku Osaka Osaka JP 556-0024 in the IEEE OUI registry entry for DC:28:34. This is the address the organization registered with the IEEE, which may differ from its current operating address.

HAKKO Corporation

MAC address prefix DC:28:34 is registered to HAKKO Corporation in the IEEE OUI registry. Any device whose MAC address begins with DC:28:34 has a network interface built by HAKKO Corporation. 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:28:34:00:00:00 to DC:28:34:FF:FF:FF.

OUI prefix: DC:28:34
Hyphen form: DC-28-34
MAC range: DC:28:34:00:00:00 – DC:28:34:FF:FF:FF
Addresses in block: 16,777,216
Organization: HAKKO Corporation
Address: 4-5, Shiokusa 2-chome, Naniwaku Osaka Osaka JP 556-0024
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.

2017-09-08Assigned to "HAKKO Corporation"
archived source →
2026-07-17Assigned to "HAKKO Corporation"

Nearby in the registry

The prefixes assigned immediately before and after DC:28:34:

FAQ

Which company owns MAC address prefix DC:28:34?: MAC address prefix DC:28:34 is registered to HAKKO Corporation in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with DC:28:34 has a network interface built by HAKKO Corporation.
What is the OUI DC:28:34?: DC:28:34 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to HAKKO Corporation. It covers every address from DC:28:34:00:00:00 to DC:28:34:FF:FF:FF, or 16,777,216 addresses in total. It is also written DC-28-34.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in DC:28:34:00:00:00 that is DC:28:34 — 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 HAKKO Corporation located?: HAKKO Corporation is listed at 4-5, Shiokusa 2-chome, Naniwaku Osaka Osaka JP 556-0024 in the IEEE OUI registry entry for DC:28:34. This is the address the organization registered with the IEEE, which may differ from its current operating address.