Which company owns MAC address prefix 78:A0:51?

MAC address prefix 78:A0:51 is registered to iiNet Labs Pty Ltd in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 78:A0:51 has a network interface built by iiNet Labs Pty Ltd.

What is the OUI 78:A0:51?

78:A0:51 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to iiNet Labs Pty Ltd. It covers every address from 78:A0:51:00:00:00 to 78:A0:51:FF:FF:FF, or 16,777,216 addresses in total. It is also written 78-A0-51.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 78:A0:51:00:00:00 that is 78:A0:51 — 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 iiNet Labs Pty Ltd located?

iiNet Labs Pty Ltd is listed at Level 1 Subiaco WA AU 6008 in the IEEE OUI registry entry for 78:A0:51. This is the address the organization registered with the IEEE, which may differ from its current operating address.

iiNet Labs Pty Ltd

MAC address prefix 78:A0:51 is registered to iiNet Labs Pty Ltd in the IEEE OUI registry. Any device whose MAC address begins with 78:A0:51 has a network interface built by iiNet Labs Pty 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 78:A0:51:00:00:00 to 78:A0:51:FF:FF:FF.

OUI prefix: 78:A0:51
Hyphen form: 78-A0-51
MAC range: 78:A0:51:00:00:00 – 78:A0:51:FF:FF:FF
Addresses in block: 16,777,216
Organization: iiNet Labs Pty Ltd
Address: Level 1 Subiaco WA AU 6008
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 "iiNet Labs Pty Ltd"
archived source →
2026-07-17Assigned to "iiNet Labs Pty Ltd"

Nearby in the registry

The prefixes assigned immediately before and after 78:A0:51:

FAQ

Which company owns MAC address prefix 78:A0:51?: MAC address prefix 78:A0:51 is registered to iiNet Labs Pty Ltd in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 78:A0:51 has a network interface built by iiNet Labs Pty Ltd.
What is the OUI 78:A0:51?: 78:A0:51 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to iiNet Labs Pty Ltd. It covers every address from 78:A0:51:00:00:00 to 78:A0:51:FF:FF:FF, or 16,777,216 addresses in total. It is also written 78-A0-51.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 78:A0:51:00:00:00 that is 78:A0:51 — 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 iiNet Labs Pty Ltd located?: iiNet Labs Pty Ltd is listed at Level 1 Subiaco WA AU 6008 in the IEEE OUI registry entry for 78:A0:51. This is the address the organization registered with the IEEE, which may differ from its current operating address.