Which company owns MAC address prefix 30:2B:DC?

MAC address prefix 30:2B:DC is registered to Top-Unum Electronics Co., LTD in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 30:2B:DC has a network interface built by Top-Unum Electronics Co., LTD.

What is the OUI 30:2B:DC?

30:2B:DC is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Top-Unum Electronics Co., LTD. It covers every address from 30:2B:DC:00:00:00 to 30:2B:DC:FF:FF:FF, or 16,777,216 addresses in total. It is also written 30-2B-DC.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 30:2B:DC:00:00:00 that is 30:2B:DC — 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 Top-Unum Electronics Co., LTD located?

Top-Unum Electronics Co., LTD is listed at No. 58, Ln. 137, Jianshan Rd., Yingge Dist., New Taipei City 239, Taiwan CN 239 in the IEEE OUI registry entry for 30:2B:DC. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Top-Unum Electronics Co., LTD

MAC address prefix 30:2B:DC is registered to Top-Unum Electronics Co., LTD in the IEEE OUI registry. Any device whose MAC address begins with 30:2B:DC has a network interface built by Top-Unum Electronics 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 30:2B:DC:00:00:00 to 30:2B:DC:FF:FF:FF.

OUI prefix: 30:2B:DC
Hyphen form: 30-2B-DC
MAC range: 30:2B:DC:00:00:00 – 30:2B:DC:FF:FF:FF
Addresses in block: 16,777,216
Organization: Top-Unum Electronics Co., LTD
Address: No. 58, Ln. 137, Jianshan Rd., Yingge Dist., New Taipei City 239, Taiwan CN 239
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 "Top-Unum Electronics Co., LTD"

Nearby in the registry

The prefixes assigned immediately before and after 30:2B:DC:

FAQ

Which company owns MAC address prefix 30:2B:DC?: MAC address prefix 30:2B:DC is registered to Top-Unum Electronics Co., LTD in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 30:2B:DC has a network interface built by Top-Unum Electronics Co., LTD.
What is the OUI 30:2B:DC?: 30:2B:DC is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Top-Unum Electronics Co., LTD. It covers every address from 30:2B:DC:00:00:00 to 30:2B:DC:FF:FF:FF, or 16,777,216 addresses in total. It is also written 30-2B-DC.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 30:2B:DC:00:00:00 that is 30:2B:DC — 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 Top-Unum Electronics Co., LTD located?: Top-Unum Electronics Co., LTD is listed at No. 58, Ln. 137, Jianshan Rd., Yingge Dist., New Taipei City 239, Taiwan CN 239 in the IEEE OUI registry entry for 30:2B:DC. This is the address the organization registered with the IEEE, which may differ from its current operating address.