Which company owns MAC address prefix A0:D3:85?

MAC address prefix A0:D3:85 is registered to AUMA Riester GmbH & Co. KG in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with A0:D3:85 has a network interface built by AUMA Riester GmbH & Co. KG.

What is the OUI A0:D3:85?

A0:D3:85 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to AUMA Riester GmbH & Co. KG. It covers every address from A0:D3:85:00:00:00 to A0:D3:85:FF:FF:FF, or 16,777,216 addresses in total. It is also written A0-D3-85.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in A0:D3:85:00:00:00 that is A0:D3:85 — 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 AUMA Riester GmbH & Co. KG located?

AUMA Riester GmbH & Co. KG is listed at Aumastr. 1 Muellheim Baden-Württemberg DE 79379 in the IEEE OUI registry entry for A0:D3:85. This is the address the organization registered with the IEEE, which may differ from its current operating address.

AUMA Riester GmbH & Co. KG

MAC address prefix A0:D3:85 is registered to AUMA Riester GmbH & Co. KG in the IEEE OUI registry. Any device whose MAC address begins with A0:D3:85 has a network interface built by AUMA Riester 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:D3:85:00:00:00 to A0:D3:85:FF:FF:FF.

OUI prefix: A0:D3:85
Hyphen form: A0-D3-85
MAC range: A0:D3:85:00:00:00 – A0:D3:85:FF:FF:FF
Addresses in block: 16,777,216
Organization: AUMA Riester GmbH & Co. KG
Address: Aumastr. 1 Muellheim Baden-Württemberg DE 79379
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 "AUMA Riester GmbH & Co. KG"
archived source →
2026-07-17Assigned to "AUMA Riester GmbH & Co. KG"

Nearby in the registry

The prefixes assigned immediately before and after A0:D3:85:

FAQ

Which company owns MAC address prefix A0:D3:85?: MAC address prefix A0:D3:85 is registered to AUMA Riester GmbH & Co. KG in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with A0:D3:85 has a network interface built by AUMA Riester GmbH & Co. KG.
What is the OUI A0:D3:85?: A0:D3:85 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to AUMA Riester GmbH & Co. KG. It covers every address from A0:D3:85:00:00:00 to A0:D3:85:FF:FF:FF, or 16,777,216 addresses in total. It is also written A0-D3-85.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in A0:D3:85:00:00:00 that is A0:D3:85 — 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 AUMA Riester GmbH & Co. KG located?: AUMA Riester GmbH & Co. KG is listed at Aumastr. 1 Muellheim Baden-Württemberg DE 79379 in the IEEE OUI registry entry for A0:D3:85. This is the address the organization registered with the IEEE, which may differ from its current operating address.