Which company owns MAC address prefix EC:A2:9B?

MAC address prefix EC:A2:9B is registered to Kemppi Oy in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with EC:A2:9B has a network interface built by Kemppi Oy.

What is the OUI EC:A2:9B?

EC:A2:9B is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Kemppi Oy. It covers every address from EC:A2:9B:00:00:00 to EC:A2:9B:FF:FF:FF, or 16,777,216 addresses in total. It is also written EC-A2-9B.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in EC:A2:9B:00:00:00 that is EC:A2:9B — 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 Kemppi Oy located?

Kemppi Oy is listed at Kempinkatu 1 Lahti Lahti FI 15810 in the IEEE OUI registry entry for EC:A2:9B. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Kemppi Oy

MAC address prefix EC:A2:9B is registered to Kemppi Oy in the IEEE OUI registry. Any device whose MAC address begins with EC:A2:9B has a network interface built by Kemppi 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 EC:A2:9B:00:00:00 to EC:A2:9B:FF:FF:FF.

OUI prefix: EC:A2:9B
Hyphen form: EC-A2-9B
MAC range: EC:A2:9B:00:00:00 – EC:A2:9B:FF:FF:FF
Addresses in block: 16,777,216
Organization: Kemppi Oy
Address: Kempinkatu 1 Lahti Lahti FI 15810
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 "Kemppi Oy"
archived source →
2026-07-17Assigned to "Kemppi Oy"

Nearby in the registry

The prefixes assigned immediately before and after EC:A2:9B:

FAQ

Which company owns MAC address prefix EC:A2:9B?: MAC address prefix EC:A2:9B is registered to Kemppi Oy in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with EC:A2:9B has a network interface built by Kemppi Oy.
What is the OUI EC:A2:9B?: EC:A2:9B is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Kemppi Oy. It covers every address from EC:A2:9B:00:00:00 to EC:A2:9B:FF:FF:FF, or 16,777,216 addresses in total. It is also written EC-A2-9B.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in EC:A2:9B:00:00:00 that is EC:A2:9B — 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 Kemppi Oy located?: Kemppi Oy is listed at Kempinkatu 1 Lahti Lahti FI 15810 in the IEEE OUI registry entry for EC:A2:9B. This is the address the organization registered with the IEEE, which may differ from its current operating address.