Which company owns MAC address prefix 20:31:8D?

MAC address prefix 20:31:8D is registered to Giax GmbH in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 20:31:8D has a network interface built by Giax GmbH.

What is the OUI 20:31:8D?

20:31:8D is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Giax GmbH. It covers every address from 20:31:8D:00:00:00 to 20:31:8D:FF:FF:FF, or 16,777,216 addresses in total. It is also written 20-31-8D.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 20:31:8D:00:00:00 that is 20:31:8D — 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 Giax GmbH located?

Giax GmbH is listed at Am Weichselgarten 7 Erlangen DE 91058 in the IEEE OUI registry entry for 20:31:8D. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Giax GmbH

MAC address prefix 20:31:8D is registered to Giax GmbH in the IEEE OUI registry. Any device whose MAC address begins with 20:31:8D has a network interface built by Giax GmbH. 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 20:31:8D:00:00:00 to 20:31:8D:FF:FF:FF.

OUI prefix: 20:31:8D
Hyphen form: 20-31-8D
MAC range: 20:31:8D:00:00:00 – 20:31:8D:FF:FF:FF
Addresses in block: 16,777,216
Organization: Giax GmbH
Address: Am Weichselgarten 7 Erlangen DE 91058
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 (1)

The IEEE registry publishes current state only — this is the change record we've kept since we started tracking it daily.

2026-07-17Assigned to "Giax GmbH"

Nearby in the registry

The prefixes assigned immediately before and after 20:31:8D:

FAQ

Which company owns MAC address prefix 20:31:8D?: MAC address prefix 20:31:8D is registered to Giax GmbH in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 20:31:8D has a network interface built by Giax GmbH.
What is the OUI 20:31:8D?: 20:31:8D is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Giax GmbH. It covers every address from 20:31:8D:00:00:00 to 20:31:8D:FF:FF:FF, or 16,777,216 addresses in total. It is also written 20-31-8D.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 20:31:8D:00:00:00 that is 20:31:8D — 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 Giax GmbH located?: Giax GmbH is listed at Am Weichselgarten 7 Erlangen DE 91058 in the IEEE OUI registry entry for 20:31:8D. This is the address the organization registered with the IEEE, which may differ from its current operating address.