Which company owns MAC address prefix CC:9F:7A?

MAC address prefix CC:9F:7A is registered to Chiun Mai Communication System, Inc in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with CC:9F:7A has a network interface built by Chiun Mai Communication System, Inc.

What is the OUI CC:9F:7A?

CC:9F:7A is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Chiun Mai Communication System, Inc. It covers every address from CC:9F:7A:00:00:00 to CC:9F:7A:FF:FF:FF, or 16,777,216 addresses in total. It is also written CC-9F-7A.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in CC:9F:7A:00:00:00 that is CC:9F:7A — 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 Chiun Mai Communication System, Inc located?

Chiun Mai Communication System, Inc is listed at No.4, Minsheng St., Tucheng District New Taipei City TW 23678 in the IEEE OUI registry entry for CC:9F:7A. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does Chiun Mai Communication System, Inc own?

Chiun Mai Communication System, Inc holds 6 OUI prefixes in the IEEE registry, of which CC:9F:7A is one. A device made by Chiun Mai Communication System, Inc could carry a MAC address from any of them.

Chiun Mai Communication System, Inc

MAC address prefix CC:9F:7A is registered to Chiun Mai Communication System, Inc in the IEEE OUI registry. Any device whose MAC address begins with CC:9F:7A has a network interface built by Chiun Mai Communication System, 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 CC:9F:7A:00:00:00 to CC:9F:7A:FF:FF:FF.

OUI prefix: CC:9F:7A
Hyphen form: CC-9F-7A
MAC range: CC:9F:7A:00:00:00 – CC:9F:7A:FF:FF:FF
Addresses in block: 16,777,216
Organization: Chiun Mai Communication System, Inc
Address: No.4, Minsheng St., Tucheng District New Taipei City TW 23678
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 Chiun Mai Communication System, Inc

Chiun Mai Communication System, Inc holds 6 OUI prefixes in total. A device with this exact prefix could just as well carry any of these:

Assignment history (3)

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

2017-09-08Assigned to "Chiun Mai Communication Systems, Inc"
archived source →
2023-07-11Renamed from "Chiun Mai Communication Systems, Inc" to "Chiun Mai Communication System, Inc"
archived source →
2026-07-17Assigned to "Chiun Mai Communication System, Inc"

Nearby in the registry

The prefixes assigned immediately before and after CC:9F:7A:

FAQ

Which company owns MAC address prefix CC:9F:7A?: MAC address prefix CC:9F:7A is registered to Chiun Mai Communication System, Inc in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with CC:9F:7A has a network interface built by Chiun Mai Communication System, Inc.
What is the OUI CC:9F:7A?: CC:9F:7A is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Chiun Mai Communication System, Inc. It covers every address from CC:9F:7A:00:00:00 to CC:9F:7A:FF:FF:FF, or 16,777,216 addresses in total. It is also written CC-9F-7A.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in CC:9F:7A:00:00:00 that is CC:9F:7A — 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 Chiun Mai Communication System, Inc located?: Chiun Mai Communication System, Inc is listed at No.4, Minsheng St., Tucheng District New Taipei City TW 23678 in the IEEE OUI registry entry for CC:9F:7A. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does Chiun Mai Communication System, Inc own?: Chiun Mai Communication System, Inc holds 6 OUI prefixes in the IEEE registry, of which CC:9F:7A is one. A device made by Chiun Mai Communication System, Inc could carry a MAC address from any of them.