Which company owns MAC address prefix A0:38:F8?

MAC address prefix A0:38:F8 is registered to OURA Health Oy in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with A0:38:F8 has a network interface built by OURA Health Oy.

What is the OUI A0:38:F8?

A0:38:F8 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to OURA Health Oy. It covers every address from A0:38:F8:00:00:00 to A0:38:F8:FF:FF:FF, or 16,777,216 addresses in total. It is also written A0-38-F8.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in A0:38:F8:00:00:00 that is A0:38:F8 — 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 OURA Health Oy located?

OURA Health Oy is listed at Elektroniikkatie 3 Oulu FI 90590 in the IEEE OUI registry entry for A0:38:F8. This is the address the organization registered with the IEEE, which may differ from its current operating address.

OURA Health Oy

MAC address prefix A0:38:F8 is registered to OURA Health Oy in the IEEE OUI registry. Any device whose MAC address begins with A0:38:F8 has a network interface built by OURA Health Oy. 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 A0:38:F8:00:00:00 to A0:38:F8:FF:FF:FF.

OUI prefix: A0:38:F8
Hyphen form: A0-38-F8
MAC range: A0:38:F8:00:00:00 – A0:38:F8:FF:FF:FF
Addresses in block: 16,777,216
Organization: OURA Health Oy
Address: Elektroniikkatie 3 Oulu FI 90590
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.

2018-12-21Assigned to "OURA Health Oy"
archived source →
2026-07-17Assigned to "OURA Health Oy"

Nearby in the registry

The prefixes assigned immediately before and after A0:38:F8:

FAQ

Which company owns MAC address prefix A0:38:F8?: MAC address prefix A0:38:F8 is registered to OURA Health Oy in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with A0:38:F8 has a network interface built by OURA Health Oy.
What is the OUI A0:38:F8?: A0:38:F8 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to OURA Health Oy. It covers every address from A0:38:F8:00:00:00 to A0:38:F8:FF:FF:FF, or 16,777,216 addresses in total. It is also written A0-38-F8.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in A0:38:F8:00:00:00 that is A0:38:F8 — 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 OURA Health Oy located?: OURA Health Oy is listed at Elektroniikkatie 3 Oulu FI 90590 in the IEEE OUI registry entry for A0:38:F8. This is the address the organization registered with the IEEE, which may differ from its current operating address.