Which company owns MAC address prefix A0:31:EB?

MAC address prefix A0:31:EB is registered to Semikron Elektronik GmbH & Co. KG in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with A0:31:EB has a network interface built by Semikron Elektronik GmbH & Co. KG.

What is the OUI A0:31:EB?

A0:31:EB is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Semikron Elektronik GmbH & Co. KG. It covers every address from A0:31:EB:00:00:00 to A0:31:EB:FF:FF:FF, or 16,777,216 addresses in total. It is also written A0-31-EB.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in A0:31:EB:00:00:00 that is A0:31:EB — 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 Semikron Elektronik GmbH & Co. KG located?

Semikron Elektronik GmbH & Co. KG is listed at Sigmundstrasse 200 Nürnberg Bavaria DE 90431 in the IEEE OUI registry entry for A0:31:EB. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Semikron Elektronik GmbH & Co. KG

MAC address prefix A0:31:EB is registered to Semikron Elektronik GmbH & Co. KG in the IEEE OUI registry. Any device whose MAC address begins with A0:31:EB has a network interface built by Semikron Elektronik GmbH & Co. KG. 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 A0:31:EB:00:00:00 to A0:31:EB:FF:FF:FF.

OUI prefix: A0:31:EB
Hyphen form: A0-31-EB
MAC range: A0:31:EB:00:00:00 – A0:31:EB:FF:FF:FF
Addresses in block: 16,777,216
Organization: Semikron Elektronik GmbH & Co. KG
Address: Sigmundstrasse 200 Nürnberg Bavaria DE 90431
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.

2023-07-11Assigned to "Semikron Elektronik GmbH & Co. KG"
archived source →
2026-07-17Assigned to "Semikron Elektronik GmbH & Co. KG"

Nearby in the registry

The prefixes assigned immediately before and after A0:31:EB:

FAQ

Which company owns MAC address prefix A0:31:EB?: MAC address prefix A0:31:EB is registered to Semikron Elektronik GmbH & Co. KG in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with A0:31:EB has a network interface built by Semikron Elektronik GmbH & Co. KG.
What is the OUI A0:31:EB?: A0:31:EB is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Semikron Elektronik GmbH & Co. KG. It covers every address from A0:31:EB:00:00:00 to A0:31:EB:FF:FF:FF, or 16,777,216 addresses in total. It is also written A0-31-EB.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in A0:31:EB:00:00:00 that is A0:31:EB — 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 Semikron Elektronik GmbH & Co. KG located?: Semikron Elektronik GmbH & Co. KG is listed at Sigmundstrasse 200 Nürnberg Bavaria DE 90431 in the IEEE OUI registry entry for A0:31:EB. This is the address the organization registered with the IEEE, which may differ from its current operating address.