Which company owns MAC address prefix 10:9A:B9?

MAC address prefix 10:9A:B9 is registered to Tosibox Oy in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 10:9A:B9 has a network interface built by Tosibox Oy.

What is the OUI 10:9A:B9?

10:9A:B9 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Tosibox Oy. It covers every address from 10:9A:B9:00:00:00 to 10:9A:B9:FF:FF:FF, or 16,777,216 addresses in total. It is also written 10-9A-B9.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 10:9A:B9:00:00:00 that is 10:9A:B9 — 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 Tosibox Oy located?

Tosibox Oy is listed at Elektroniikkatie 8 Oulu FI 90590 in the IEEE OUI registry entry for 10:9A:B9. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Tosibox Oy

MAC address prefix 10:9A:B9 is registered to Tosibox Oy in the IEEE OUI registry. Any device whose MAC address begins with 10:9A:B9 has a network interface built by Tosibox 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 10:9A:B9:00:00:00 to 10:9A:B9:FF:FF:FF.

OUI prefix: 10:9A:B9
Hyphen form: 10-9A-B9
MAC range: 10:9A:B9:00:00:00 – 10:9A:B9:FF:FF:FF
Addresses in block: 16,777,216
Organization: Tosibox Oy
Address: Elektroniikkatie 8 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.

2016-07-29Assigned to "Tosibox Oy"
archived source →
2026-07-17Assigned to "Tosibox Oy"

Nearby in the registry

The prefixes assigned immediately before and after 10:9A:B9:

FAQ

Which company owns MAC address prefix 10:9A:B9?: MAC address prefix 10:9A:B9 is registered to Tosibox Oy in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 10:9A:B9 has a network interface built by Tosibox Oy.
What is the OUI 10:9A:B9?: 10:9A:B9 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Tosibox Oy. It covers every address from 10:9A:B9:00:00:00 to 10:9A:B9:FF:FF:FF, or 16,777,216 addresses in total. It is also written 10-9A-B9.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 10:9A:B9:00:00:00 that is 10:9A:B9 — 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 Tosibox Oy located?: Tosibox Oy is listed at Elektroniikkatie 8 Oulu FI 90590 in the IEEE OUI registry entry for 10:9A:B9. This is the address the organization registered with the IEEE, which may differ from its current operating address.