Which company owns MAC address prefix 84:67:9A?

MAC address prefix 84:67:9A is registered to Arm Ltd in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 84:67:9A has a network interface built by Arm Ltd.

What is the OUI 84:67:9A?

84:67:9A is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Arm Ltd. It covers every address from 84:67:9A:00:00:00 to 84:67:9A:FF:FF:FF, or 16,777,216 addresses in total. It is also written 84-67-9A.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 84:67:9A:00:00:00 that is 84:67:9A — 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 Arm Ltd located?

Arm Ltd is listed at 110 Fulbourn Road Cambridge Cambridgeshire GB CB19NJ in the IEEE OUI registry entry for 84:67:9A. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Arm Ltd

MAC address prefix 84:67:9A is registered to Arm Ltd in the IEEE OUI registry. Any device whose MAC address begins with 84:67:9A has a network interface built by Arm Ltd. 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 84:67:9A:00:00:00 to 84:67:9A:FF:FF:FF.

OUI prefix: 84:67:9A
Hyphen form: 84-67-9A
MAC range: 84:67:9A:00:00:00 – 84:67:9A:FF:FF:FF
Addresses in block: 16,777,216
Organization: Arm Ltd
Address: 110 Fulbourn Road Cambridge Cambridgeshire GB CB19NJ
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.

2026-06-20Assigned to "Arm Ltd"
archived source →
2026-07-17Assigned to "Arm Ltd"

Nearby in the registry

The prefixes assigned immediately before and after 84:67:9A:

FAQ

Which company owns MAC address prefix 84:67:9A?: MAC address prefix 84:67:9A is registered to Arm Ltd in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 84:67:9A has a network interface built by Arm Ltd.
What is the OUI 84:67:9A?: 84:67:9A is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Arm Ltd. It covers every address from 84:67:9A:00:00:00 to 84:67:9A:FF:FF:FF, or 16,777,216 addresses in total. It is also written 84-67-9A.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 84:67:9A:00:00:00 that is 84:67:9A — 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 Arm Ltd located?: Arm Ltd is listed at 110 Fulbourn Road Cambridge Cambridgeshire GB CB19NJ in the IEEE OUI registry entry for 84:67:9A. This is the address the organization registered with the IEEE, which may differ from its current operating address.