Which company owns MAC address prefix 38:31:AC?

MAC address prefix 38:31:AC is registered to WEG in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 38:31:AC has a network interface built by WEG.

What is the OUI 38:31:AC?

38:31:AC is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to WEG. It covers every address from 38:31:AC:00:00:00 to 38:31:AC:FF:FF:FF, or 16,777,216 addresses in total. It is also written 38-31-AC.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 38:31:AC:00:00:00 that is 38:31:AC — 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 WEG located?

WEG is listed at Av. Pref. Waldemar Grubba, 3000 Jaraguá do Sul Santa Catarina BR 89256-900 in the IEEE OUI registry entry for 38:31:AC. This is the address the organization registered with the IEEE, which may differ from its current operating address.

WEG

MAC address prefix 38:31:AC is registered to WEG in the IEEE OUI registry. Any device whose MAC address begins with 38:31:AC has a network interface built by WEG. 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 38:31:AC:00:00:00 to 38:31:AC:FF:FF:FF.

OUI prefix: 38:31:AC
Hyphen form: 38-31-AC
MAC range: 38:31:AC:00:00:00 – 38:31:AC:FF:FF:FF
Addresses in block: 16,777,216
Organization: WEG
Address: Av. Pref. Waldemar Grubba, 3000 Jaraguá do Sul Santa Catarina BR 89256-900
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 "WEG"
archived source →
2026-07-17Assigned to "WEG"

Nearby in the registry

The prefixes assigned immediately before and after 38:31:AC:

FAQ

Which company owns MAC address prefix 38:31:AC?: MAC address prefix 38:31:AC is registered to WEG in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 38:31:AC has a network interface built by WEG.
What is the OUI 38:31:AC?: 38:31:AC is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to WEG. It covers every address from 38:31:AC:00:00:00 to 38:31:AC:FF:FF:FF, or 16,777,216 addresses in total. It is also written 38-31-AC.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 38:31:AC:00:00:00 that is 38:31:AC — 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 WEG located?: WEG is listed at Av. Pref. Waldemar Grubba, 3000 Jaraguá do Sul Santa Catarina BR 89256-900 in the IEEE OUI registry entry for 38:31:AC. This is the address the organization registered with the IEEE, which may differ from its current operating address.