Which company owns MAC address prefix DC:D5:2A?

MAC address prefix DC:D5:2A is registered to Sunny Heart Limited in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with DC:D5:2A has a network interface built by Sunny Heart Limited.

What is the OUI DC:D5:2A?

DC:D5:2A is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Sunny Heart Limited. It covers every address from DC:D5:2A:00:00:00 to DC:D5:2A:FF:FF:FF, or 16,777,216 addresses in total. It is also written DC-D5-2A.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in DC:D5:2A:00:00:00 that is DC:D5:2A — 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 Sunny Heart Limited located?

Sunny Heart Limited is listed at Rm. 1516, 15/F, Hewlett Center Kwun Tong Kowloon HK 852 in the IEEE OUI registry entry for DC:D5:2A. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Sunny Heart Limited

MAC address prefix DC:D5:2A is registered to Sunny Heart Limited in the IEEE OUI registry. Any device whose MAC address begins with DC:D5:2A has a network interface built by Sunny Heart Limited. 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:D5:2A:00:00:00 to DC:D5:2A:FF:FF:FF.

OUI prefix: DC:D5:2A
Hyphen form: DC-D5-2A
MAC range: DC:D5:2A:00:00:00 – DC:D5:2A:FF:FF:FF
Addresses in block: 16,777,216
Organization: Sunny Heart Limited
Address: Rm. 1516, 15/F, Hewlett Center Kwun Tong Kowloon HK 852
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 "Sunny Heart Limited"
archived source →
2026-07-17Assigned to "Sunny Heart Limited"

Nearby in the registry

The prefixes assigned immediately before and after DC:D5:2A:

FAQ

Which company owns MAC address prefix DC:D5:2A?: MAC address prefix DC:D5:2A is registered to Sunny Heart Limited in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with DC:D5:2A has a network interface built by Sunny Heart Limited.
What is the OUI DC:D5:2A?: DC:D5:2A is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Sunny Heart Limited. It covers every address from DC:D5:2A:00:00:00 to DC:D5:2A:FF:FF:FF, or 16,777,216 addresses in total. It is also written DC-D5-2A.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in DC:D5:2A:00:00:00 that is DC:D5:2A — 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 Sunny Heart Limited located?: Sunny Heart Limited is listed at Rm. 1516, 15/F, Hewlett Center Kwun Tong Kowloon HK 852 in the IEEE OUI registry entry for DC:D5:2A. This is the address the organization registered with the IEEE, which may differ from its current operating address.