Which company owns MAC address prefix AC:40:EA?

MAC address prefix AC:40:EA is registered to C&T Solution Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with AC:40:EA has a network interface built by C&T Solution Inc..

What is the OUI AC:40:EA?

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

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in AC:40:EA:00:00:00 that is AC:40:EA — 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 C&T Solution Inc. located?

C&T Solution Inc. is listed at 12F-1, No.700, Zhongzheng Rd., Zhonghe Dist. New Taipei City Taiwan TW 235 in the IEEE OUI registry entry for AC:40:EA. This is the address the organization registered with the IEEE, which may differ from its current operating address.

C&T Solution Inc.

MAC address prefix AC:40:EA is registered to C&T Solution Inc. in the IEEE OUI registry. Any device whose MAC address begins with AC:40:EA has a network interface built by C&T Solution Inc.. 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 AC:40:EA:00:00:00 to AC:40:EA:FF:FF:FF.

OUI prefix: AC:40:EA
Hyphen form: AC-40-EA
MAC range: AC:40:EA:00:00:00 – AC:40:EA:FF:FF:FF
Addresses in block: 16,777,216
Organization: C&T Solution Inc.
Address: 12F-1, No.700, Zhongzheng Rd., Zhonghe Dist. New Taipei City Taiwan TW 235
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 "C&T Solution Inc."
archived source →
2026-07-17Assigned to "C&T Solution Inc."

Nearby in the registry

The prefixes assigned immediately before and after AC:40:EA:

FAQ

Which company owns MAC address prefix AC:40:EA?: MAC address prefix AC:40:EA is registered to C&T Solution Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with AC:40:EA has a network interface built by C&T Solution Inc..
What is the OUI AC:40:EA?: AC:40:EA is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to C&T Solution Inc.. It covers every address from AC:40:EA:00:00:00 to AC:40:EA:FF:FF:FF, or 16,777,216 addresses in total. It is also written AC-40-EA.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in AC:40:EA:00:00:00 that is AC:40:EA — 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 C&T Solution Inc. located?: C&T Solution Inc. is listed at 12F-1, No.700, Zhongzheng Rd., Zhonghe Dist. New Taipei City Taiwan TW 235 in the IEEE OUI registry entry for AC:40:EA. This is the address the organization registered with the IEEE, which may differ from its current operating address.