Which company owns MAC address prefix 34:21:09?

MAC address prefix 34:21:09 is registered to Jensen Scandinavia AS in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 34:21:09 has a network interface built by Jensen Scandinavia AS.

What is the OUI 34:21:09?

34:21:09 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Jensen Scandinavia AS. It covers every address from 34:21:09:00:00:00 to 34:21:09:FF:FF:FF, or 16,777,216 addresses in total. It is also written 34-21-09.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 34:21:09:00:00:00 that is 34:21:09 — 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 Jensen Scandinavia AS located?

Jensen Scandinavia AS is listed at Balder Allé 3 Jessheim NO 2050 in the IEEE OUI registry entry for 34:21:09. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Jensen Scandinavia AS

MAC address prefix 34:21:09 is registered to Jensen Scandinavia AS in the IEEE OUI registry. Any device whose MAC address begins with 34:21:09 has a network interface built by Jensen Scandinavia AS. 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 34:21:09:00:00:00 to 34:21:09:FF:FF:FF.

OUI prefix: 34:21:09
Hyphen form: 34-21-09
MAC range: 34:21:09:00:00:00 – 34:21:09:FF:FF:FF
Addresses in block: 16,777,216
Organization: Jensen Scandinavia AS
Address: Balder Allé 3 Jessheim NO 2050
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 "Jensen Scandinavia AS"
archived source →
2026-07-17Assigned to "Jensen Scandinavia AS"

Nearby in the registry

The prefixes assigned immediately before and after 34:21:09:

FAQ

Which company owns MAC address prefix 34:21:09?: MAC address prefix 34:21:09 is registered to Jensen Scandinavia AS in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 34:21:09 has a network interface built by Jensen Scandinavia AS.
What is the OUI 34:21:09?: 34:21:09 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Jensen Scandinavia AS. It covers every address from 34:21:09:00:00:00 to 34:21:09:FF:FF:FF, or 16,777,216 addresses in total. It is also written 34-21-09.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 34:21:09:00:00:00 that is 34:21:09 — 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 Jensen Scandinavia AS located?: Jensen Scandinavia AS is listed at Balder Allé 3 Jessheim NO 2050 in the IEEE OUI registry entry for 34:21:09. This is the address the organization registered with the IEEE, which may differ from its current operating address.