Which company owns MAC address prefix 84:77:78?

MAC address prefix 84:77:78 is registered to Cochlear Limited in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 84:77:78 has a network interface built by Cochlear Limited.

What is the OUI 84:77:78?

84:77:78 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Cochlear Limited. It covers every address from 84:77:78:00:00:00 to 84:77:78:FF:FF:FF, or 16,777,216 addresses in total. It is also written 84-77-78.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 84:77:78:00:00:00 that is 84:77:78 — 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 Cochlear Limited located?

Cochlear Limited is listed at 1 University Avenue Sydney New South Wales AU 2109 in the IEEE OUI registry entry for 84:77:78. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Cochlear Limited

MAC address prefix 84:77:78 is registered to Cochlear Limited in the IEEE OUI registry. Any device whose MAC address begins with 84:77:78 has a network interface built by Cochlear Limited. 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 84:77:78:00:00:00 to 84:77:78:FF:FF:FF.

OUI prefix: 84:77:78
Hyphen form: 84-77-78
MAC range: 84:77:78:00:00:00 – 84:77:78:FF:FF:FF
Addresses in block: 16,777,216
Organization: Cochlear Limited
Address: 1 University Avenue Sydney New South Wales AU 2109
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 "Cochlear Limited"
archived source →
2026-07-17Assigned to "Cochlear Limited"

Nearby in the registry

The prefixes assigned immediately before and after 84:77:78:

FAQ

Which company owns MAC address prefix 84:77:78?: MAC address prefix 84:77:78 is registered to Cochlear Limited in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 84:77:78 has a network interface built by Cochlear Limited.
What is the OUI 84:77:78?: 84:77:78 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Cochlear Limited. It covers every address from 84:77:78:00:00:00 to 84:77:78:FF:FF:FF, or 16,777,216 addresses in total. It is also written 84-77-78.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 84:77:78:00:00:00 that is 84:77:78 — 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 Cochlear Limited located?: Cochlear Limited is listed at 1 University Avenue Sydney New South Wales AU 2109 in the IEEE OUI registry entry for 84:77:78. This is the address the organization registered with the IEEE, which may differ from its current operating address.