Which company owns MAC address prefix 40:5A:DD?

MAC address prefix 40:5A:DD is registered to Actions Microelectronics in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 40:5A:DD has a network interface built by Actions Microelectronics.

What is the OUI 40:5A:DD?

40:5A:DD is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Actions Microelectronics. It covers every address from 40:5A:DD:00:00:00 to 40:5A:DD:FF:FF:FF, or 16,777,216 addresses in total. It is also written 40-5A-DD.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 40:5A:DD:00:00:00 that is 40:5A:DD — 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 Actions Microelectronics located?

Actions Microelectronics is listed at 201, No. 9 Building, Software Park, KeJiZhongEr Road., GaoXingQu, NanShan Shenzhen Guangdong CN 518057 in the IEEE OUI registry entry for 40:5A:DD. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does Actions Microelectronics own?

Actions Microelectronics holds 3 OUI prefixes in the IEEE registry, of which 40:5A:DD is one. A device made by Actions Microelectronics could carry a MAC address from any of them.

Actions Microelectronics

MAC address prefix 40:5A:DD is registered to Actions Microelectronics in the IEEE OUI registry. Any device whose MAC address begins with 40:5A:DD has a network interface built by Actions Microelectronics. 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 40:5A:DD:00:00:00 to 40:5A:DD:FF:FF:FF.

OUI prefix: 40:5A:DD
Hyphen form: 40-5A-DD
MAC range: 40:5A:DD:00:00:00 – 40:5A:DD:FF:FF:FF
Addresses in block: 16,777,216
Organization: Actions Microelectronics
Address: 201, No. 9 Building, Software Park, KeJiZhongEr Road., GaoXingQu, NanShan Shenzhen Guangdong CN 518057
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 Actions Microelectronics

Actions Microelectronics holds 3 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.

2026-01-08Assigned to "Actions Microelectronics"
archived source →
2026-07-17Assigned to "Actions Microelectronics"

Nearby in the registry

The prefixes assigned immediately before and after 40:5A:DD:

FAQ

Which company owns MAC address prefix 40:5A:DD?: MAC address prefix 40:5A:DD is registered to Actions Microelectronics in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 40:5A:DD has a network interface built by Actions Microelectronics.
What is the OUI 40:5A:DD?: 40:5A:DD is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Actions Microelectronics. It covers every address from 40:5A:DD:00:00:00 to 40:5A:DD:FF:FF:FF, or 16,777,216 addresses in total. It is also written 40-5A-DD.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 40:5A:DD:00:00:00 that is 40:5A:DD — 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 Actions Microelectronics located?: Actions Microelectronics is listed at 201, No. 9 Building, Software Park, KeJiZhongEr Road., GaoXingQu, NanShan Shenzhen Guangdong CN 518057 in the IEEE OUI registry entry for 40:5A:DD. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does Actions Microelectronics own?: Actions Microelectronics holds 3 OUI prefixes in the IEEE registry, of which 40:5A:DD is one. A device made by Actions Microelectronics could carry a MAC address from any of them.