Which company owns MAC address prefix A8:A9:13?

MAC address prefix A8:A9:13 is registered to GN Hearing A/S in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with A8:A9:13 has a network interface built by GN Hearing A/S.

What is the OUI A8:A9:13?

A8:A9:13 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to GN Hearing A/S. It covers every address from A8:A9:13:00:00:00 to A8:A9:13:FF:FF:FF, or 16,777,216 addresses in total. It is also written A8-A9-13.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in A8:A9:13:00:00:00 that is A8:A9:13 — 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 GN Hearing A/S located?

GN Hearing A/S is listed at Lautrupbjerg 7 Ballerup DK 2750 in the IEEE OUI registry entry for A8:A9:13. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does GN Hearing A/S own?

GN Hearing A/S holds 3 OUI prefixes in the IEEE registry, of which A8:A9:13 is one. A device made by GN Hearing A/S could carry a MAC address from any of them.

GN Hearing A/S

MAC address prefix A8:A9:13 is registered to GN Hearing A/S in the IEEE OUI registry. Any device whose MAC address begins with A8:A9:13 has a network interface built by GN Hearing A/S. 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 A8:A9:13:00:00:00 to A8:A9:13:FF:FF:FF.

OUI prefix: A8:A9:13
Hyphen form: A8-A9-13
MAC range: A8:A9:13:00:00:00 – A8:A9:13:FF:FF:FF
Addresses in block: 16,777,216
Organization: GN Hearing A/S
Address: Lautrupbjerg 7 Ballerup DK 2750
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 GN Hearing A/S

GN Hearing A/S holds 3 OUI prefixes in total. A device with this exact prefix could just as well carry any of these:

Assignment history (2)

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

2024-06-23Assigned to "GN Hearing A/S"
archived source →
2026-07-17Assigned to "GN Hearing A/S"

Nearby in the registry

The prefixes assigned immediately before and after A8:A9:13:

FAQ

Which company owns MAC address prefix A8:A9:13?: MAC address prefix A8:A9:13 is registered to GN Hearing A/S in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with A8:A9:13 has a network interface built by GN Hearing A/S.
What is the OUI A8:A9:13?: A8:A9:13 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to GN Hearing A/S. It covers every address from A8:A9:13:00:00:00 to A8:A9:13:FF:FF:FF, or 16,777,216 addresses in total. It is also written A8-A9-13.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in A8:A9:13:00:00:00 that is A8:A9:13 — 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 GN Hearing A/S located?: GN Hearing A/S is listed at Lautrupbjerg 7 Ballerup DK 2750 in the IEEE OUI registry entry for A8:A9:13. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does GN Hearing A/S own?: GN Hearing A/S holds 3 OUI prefixes in the IEEE registry, of which A8:A9:13 is one. A device made by GN Hearing A/S could carry a MAC address from any of them.