Which company owns MAC address prefix B0:CF:4D?

MAC address prefix B0:CF:4D is registered to MI-Zone Technology Ireland in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with B0:CF:4D has a network interface built by MI-Zone Technology Ireland.

What is the OUI B0:CF:4D?

B0:CF:4D is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to MI-Zone Technology Ireland. It covers every address from B0:CF:4D:00:00:00 to B0:CF:4D:FF:FF:FF, or 16,777,216 addresses in total. It is also written B0-CF-4D.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in B0:CF:4D:00:00:00 that is B0:CF:4D — 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 MI-Zone Technology Ireland located?

MI-Zone Technology Ireland is listed at 2nd floor,block 10 unit 3 dublin Blanchardstown IE 15 in the IEEE OUI registry entry for B0:CF:4D. This is the address the organization registered with the IEEE, which may differ from its current operating address.

MI-Zone Technology Ireland

MAC address prefix B0:CF:4D is registered to MI-Zone Technology Ireland in the IEEE OUI registry. Any device whose MAC address begins with B0:CF:4D has a network interface built by MI-Zone Technology Ireland. 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:CF:4D:00:00:00 to B0:CF:4D:FF:FF:FF.

OUI prefix: B0:CF:4D
Hyphen form: B0-CF-4D
MAC range: B0:CF:4D:00:00:00 – B0:CF:4D:FF:FF:FF
Addresses in block: 16,777,216
Organization: MI-Zone Technology Ireland
Address: 2nd floor,block 10 unit 3 dublin Blanchardstown IE 15
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 "MI-Zone Technology Ireland"
archived source →
2026-07-17Assigned to "MI-Zone Technology Ireland"

Nearby in the registry

The prefixes assigned immediately before and after B0:CF:4D:

FAQ

Which company owns MAC address prefix B0:CF:4D?: MAC address prefix B0:CF:4D is registered to MI-Zone Technology Ireland in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with B0:CF:4D has a network interface built by MI-Zone Technology Ireland.
What is the OUI B0:CF:4D?: B0:CF:4D is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to MI-Zone Technology Ireland. It covers every address from B0:CF:4D:00:00:00 to B0:CF:4D:FF:FF:FF, or 16,777,216 addresses in total. It is also written B0-CF-4D.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in B0:CF:4D:00:00:00 that is B0:CF:4D — 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 MI-Zone Technology Ireland located?: MI-Zone Technology Ireland is listed at 2nd floor,block 10 unit 3 dublin Blanchardstown IE 15 in the IEEE OUI registry entry for B0:CF:4D. This is the address the organization registered with the IEEE, which may differ from its current operating address.