Which company owns MAC address prefix 04:5A:3D?

MAC address prefix 04:5A:3D is registered to Nothing Technology Limited in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 04:5A:3D has a network interface built by Nothing Technology Limited.

What is the OUI 04:5A:3D?

04:5A:3D is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Nothing Technology Limited. It covers every address from 04:5A:3D:00:00:00 to 04:5A:3D:FF:FF:FF, or 16,777,216 addresses in total. It is also written 04-5A-3D.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 04:5A:3D:00:00:00 that is 04:5A:3D — 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 Nothing Technology Limited located?

Nothing Technology Limited is listed at 11 Staple Inn London London GB WC1V 7QH in the IEEE OUI registry entry for 04:5A:3D. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does Nothing Technology Limited own?

Nothing Technology Limited holds 4 OUI prefixes in the IEEE registry, of which 04:5A:3D is one. A device made by Nothing Technology Limited could carry a MAC address from any of them.

Nothing Technology Limited

MAC address prefix 04:5A:3D is registered to Nothing Technology Limited in the IEEE OUI registry. Any device whose MAC address begins with 04:5A:3D has a network interface built by Nothing Technology 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 04:5A:3D:00:00:00 to 04:5A:3D:FF:FF:FF.

OUI prefix: 04:5A:3D
Hyphen form: 04-5A-3D
MAC range: 04:5A:3D:00:00:00 – 04:5A:3D:FF:FF:FF
Addresses in block: 16,777,216
Organization: Nothing Technology Limited
Address: 11 Staple Inn London London GB WC1V 7QH
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.

Other prefixes from Nothing Technology Limited

Nothing Technology Limited holds 4 OUI prefixes in total. A device with this exact prefix could just as well carry any of these:

Assignment history (2)

The IEEE registry publishes current state only — this is the change record we've kept since we started tracking it daily.

2026-06-20Assigned to "Nothing Technology Limited"
archived source →
2026-07-17Assigned to "Nothing Technology Limited"

Nearby in the registry

The prefixes assigned immediately before and after 04:5A:3D:

FAQ

Which company owns MAC address prefix 04:5A:3D?: MAC address prefix 04:5A:3D is registered to Nothing Technology Limited in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 04:5A:3D has a network interface built by Nothing Technology Limited.
What is the OUI 04:5A:3D?: 04:5A:3D is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Nothing Technology Limited. It covers every address from 04:5A:3D:00:00:00 to 04:5A:3D:FF:FF:FF, or 16,777,216 addresses in total. It is also written 04-5A-3D.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 04:5A:3D:00:00:00 that is 04:5A:3D — 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 Nothing Technology Limited located?: Nothing Technology Limited is listed at 11 Staple Inn London London GB WC1V 7QH in the IEEE OUI registry entry for 04:5A:3D. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does Nothing Technology Limited own?: Nothing Technology Limited holds 4 OUI prefixes in the IEEE registry, of which 04:5A:3D is one. A device made by Nothing Technology Limited could carry a MAC address from any of them.