Which company owns MAC address prefix 10:C9:CA?

MAC address prefix 10:C9:CA is registered to Ace Technology Corp. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 10:C9:CA has a network interface built by Ace Technology Corp..

What is the OUI 10:C9:CA?

10:C9:CA is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Ace Technology Corp.. It covers every address from 10:C9:CA:00:00:00 to 10:C9:CA:FF:FF:FF, or 16,777,216 addresses in total. It is also written 10-C9-CA.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 10:C9:CA:00:00:00 that is 10:C9:CA — 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 Ace Technology Corp. located?

Ace Technology Corp. is listed at 237, Namdongseo-ro, Namdong-gu Incheon KR 21634 in the IEEE OUI registry entry for 10:C9:CA. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Ace Technology Corp.

MAC address prefix 10:C9:CA is registered to Ace Technology Corp. in the IEEE OUI registry. Any device whose MAC address begins with 10:C9:CA has a network interface built by Ace Technology Corp.. 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 10:C9:CA:00:00:00 to 10:C9:CA:FF:FF:FF.

OUI prefix: 10:C9:CA
Hyphen form: 10-C9-CA
MAC range: 10:C9:CA:00:00:00 – 10:C9:CA:FF:FF:FF
Addresses in block: 16,777,216
Organization: Ace Technology Corp.
Address: 237, Namdongseo-ro, Namdong-gu Incheon KR 21634
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.

2021-02-25Assigned to "Ace Technology Corp."
archived source →
2026-07-17Assigned to "Ace Technology Corp."

Nearby in the registry

The prefixes assigned immediately before and after 10:C9:CA:

FAQ

Which company owns MAC address prefix 10:C9:CA?: MAC address prefix 10:C9:CA is registered to Ace Technology Corp. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 10:C9:CA has a network interface built by Ace Technology Corp..
What is the OUI 10:C9:CA?: 10:C9:CA is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Ace Technology Corp.. It covers every address from 10:C9:CA:00:00:00 to 10:C9:CA:FF:FF:FF, or 16,777,216 addresses in total. It is also written 10-C9-CA.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 10:C9:CA:00:00:00 that is 10:C9:CA — 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 Ace Technology Corp. located?: Ace Technology Corp. is listed at 237, Namdongseo-ro, Namdong-gu Incheon KR 21634 in the IEEE OUI registry entry for 10:C9:CA. This is the address the organization registered with the IEEE, which may differ from its current operating address.