Which company owns MAC address prefix 40:9C:A6?

MAC address prefix 40:9C:A6 is registered to Curvalux in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 40:9C:A6 has a network interface built by Curvalux.

What is the OUI 40:9C:A6?

40:9C:A6 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Curvalux. It covers every address from 40:9C:A6:00:00:00 to 40:9C:A6:FF:FF:FF, or 16,777,216 addresses in total. It is also written 40-9C-A6.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 40:9C:A6:00:00:00 that is 40:9C:A6 — 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 Curvalux located?

Curvalux is listed at Electric Works, 3 Concourse Way, Sheffield GB S1 2BJ in the IEEE OUI registry entry for 40:9C:A6. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Curvalux

MAC address prefix 40:9C:A6 is registered to Curvalux in the IEEE OUI registry. Any device whose MAC address begins with 40:9C:A6 has a network interface built by Curvalux. 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 40:9C:A6:00:00:00 to 40:9C:A6:FF:FF:FF.

OUI prefix: 40:9C:A6
Hyphen form: 40-9C-A6
MAC range: 40:9C:A6:00:00:00 – 40:9C:A6:FF:FF:FF
Addresses in block: 16,777,216
Organization: Curvalux
Address: Electric Works, 3 Concourse Way, Sheffield GB S1 2BJ
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 (1)

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

2026-07-17Assigned to "Curvalux"

Nearby in the registry

The prefixes assigned immediately before and after 40:9C:A6:

FAQ

Which company owns MAC address prefix 40:9C:A6?: MAC address prefix 40:9C:A6 is registered to Curvalux in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 40:9C:A6 has a network interface built by Curvalux.
What is the OUI 40:9C:A6?: 40:9C:A6 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Curvalux. It covers every address from 40:9C:A6:00:00:00 to 40:9C:A6:FF:FF:FF, or 16,777,216 addresses in total. It is also written 40-9C-A6.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 40:9C:A6:00:00:00 that is 40:9C:A6 — 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 Curvalux located?: Curvalux is listed at Electric Works, 3 Concourse Way, Sheffield GB S1 2BJ in the IEEE OUI registry entry for 40:9C:A6. This is the address the organization registered with the IEEE, which may differ from its current operating address.