Which company owns MAC address prefix B0:12:03?

MAC address prefix B0:12:03 is registered to Dynamics Hong Kong Limited in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with B0:12:03 has a network interface built by Dynamics Hong Kong Limited.

What is the OUI B0:12:03?

B0:12:03 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Dynamics Hong Kong Limited. It covers every address from B0:12:03:00:00:00 to B0:12:03:FF:FF:FF, or 16,777,216 addresses in total. It is also written B0-12-03.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in B0:12:03:00:00:00 that is B0:12:03 — 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 Dynamics Hong Kong Limited located?

Dynamics Hong Kong Limited is listed at Room A4, 3/F, Friend's House , No.6A Carnarvon Road, HK 999077 in the IEEE OUI registry entry for B0:12:03. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Dynamics Hong Kong Limited

MAC address prefix B0:12:03 is registered to Dynamics Hong Kong Limited in the IEEE OUI registry. Any device whose MAC address begins with B0:12:03 has a network interface built by Dynamics Hong Kong 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 B0:12:03:00:00:00 to B0:12:03:FF:FF:FF.

OUI prefix: B0:12:03
Hyphen form: B0-12-03
MAC range: B0:12:03:00:00:00 – B0:12:03:FF:FF:FF
Addresses in block: 16,777,216
Organization: Dynamics Hong Kong Limited
Address: Room A4, 3/F, Friend's House , No.6A Carnarvon Road, HK 999077
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 "Dynamics Hong Kong Limited"
archived source →
2026-07-17Assigned to "Dynamics Hong Kong Limited"

Nearby in the registry

The prefixes assigned immediately before and after B0:12:03:

FAQ

Which company owns MAC address prefix B0:12:03?: MAC address prefix B0:12:03 is registered to Dynamics Hong Kong Limited in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with B0:12:03 has a network interface built by Dynamics Hong Kong Limited.
What is the OUI B0:12:03?: B0:12:03 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Dynamics Hong Kong Limited. It covers every address from B0:12:03:00:00:00 to B0:12:03:FF:FF:FF, or 16,777,216 addresses in total. It is also written B0-12-03.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in B0:12:03:00:00:00 that is B0:12:03 — 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 Dynamics Hong Kong Limited located?: Dynamics Hong Kong Limited is listed at Room A4, 3/F, Friend's House , No.6A Carnarvon Road, HK 999077 in the IEEE OUI registry entry for B0:12:03. This is the address the organization registered with the IEEE, which may differ from its current operating address.