Which company owns MAC address prefix 8C:A9:FD?

MAC address prefix 8C:A9:FD is registered to Copper Mountain Technologies in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 8C:A9:FD has a network interface built by Copper Mountain Technologies.

What is the OUI 8C:A9:FD?

8C:A9:FD is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Copper Mountain Technologies. It covers every address from 8C:A9:FD:00:00:00 to 8C:A9:FD:FF:FF:FF, or 16,777,216 addresses in total. It is also written 8C-A9-FD.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 8C:A9:FD:00:00:00 that is 8C:A9:FD — 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 Copper Mountain Technologies located?

Copper Mountain Technologies is listed at 631 E New York St Indianapolis IN US 46202 in the IEEE OUI registry entry for 8C:A9:FD. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Copper Mountain Technologies

MAC address prefix 8C:A9:FD is registered to Copper Mountain Technologies in the IEEE OUI registry. Any device whose MAC address begins with 8C:A9:FD has a network interface built by Copper Mountain Technologies. 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 8C:A9:FD:00:00:00 to 8C:A9:FD:FF:FF:FF.

OUI prefix: 8C:A9:FD
Hyphen form: 8C-A9-FD
MAC range: 8C:A9:FD:00:00:00 – 8C:A9:FD:FF:FF:FF
Addresses in block: 16,777,216
Organization: Copper Mountain Technologies
Address: 631 E New York St Indianapolis IN US 46202
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 "Copper Mountain Technologies"

Nearby in the registry

The prefixes assigned immediately before and after 8C:A9:FD:

FAQ

Which company owns MAC address prefix 8C:A9:FD?: MAC address prefix 8C:A9:FD is registered to Copper Mountain Technologies in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 8C:A9:FD has a network interface built by Copper Mountain Technologies.
What is the OUI 8C:A9:FD?: 8C:A9:FD is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Copper Mountain Technologies. It covers every address from 8C:A9:FD:00:00:00 to 8C:A9:FD:FF:FF:FF, or 16,777,216 addresses in total. It is also written 8C-A9-FD.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 8C:A9:FD:00:00:00 that is 8C:A9:FD — 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 Copper Mountain Technologies located?: Copper Mountain Technologies is listed at 631 E New York St Indianapolis IN US 46202 in the IEEE OUI registry entry for 8C:A9:FD. This is the address the organization registered with the IEEE, which may differ from its current operating address.