Which company owns MAC address prefix 00:11:B4?

MAC address prefix 00:11:B4 is registered to Westermo Network Technologies AB in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 00:11:B4 has a network interface built by Westermo Network Technologies AB.

What is the OUI 00:11:B4?

00:11:B4 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Westermo Network Technologies AB. It covers every address from 00:11:B4:00:00:00 to 00:11:B4:FF:FF:FF, or 16,777,216 addresses in total. It is also written 00-11-B4.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 00:11:B4:00:00:00 that is 00:11:B4 — 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 Westermo Network Technologies AB located?

Westermo Network Technologies AB is listed at Stora Sundby Sweden SE SE-640 40 in the IEEE OUI registry entry for 00:11:B4. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does Westermo Network Technologies AB own?

Westermo Network Technologies AB holds 2 OUI prefixes in the IEEE registry, of which 00:11:B4 is one. A device made by Westermo Network Technologies AB could carry a MAC address from any of them.

Westermo Network Technologies AB

MAC address prefix 00:11:B4 is registered to Westermo Network Technologies AB in the IEEE OUI registry. Any device whose MAC address begins with 00:11:B4 has a network interface built by Westermo Network Technologies AB. 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 00:11:B4:00:00:00 to 00:11:B4:FF:FF:FF.

OUI prefix: 00:11:B4
Hyphen form: 00-11-B4
MAC range: 00:11:B4:00:00:00 – 00:11:B4:FF:FF:FF
Addresses in block: 16,777,216
Organization: Westermo Network Technologies AB
Address: Stora Sundby Sweden SE SE-640 40
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.

Other prefixes from Westermo Network Technologies AB

Westermo Network Technologies AB holds 2 OUI prefixes in total. A device with this exact prefix could just as well carry any of these:

00:07:7C

Assignment history (3)

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 "Westermo Teleindustri AB"
archived source →
2019-07-04Renamed from "Westermo Teleindustri AB" to "Westermo Network Technologies AB"
archived source →
2026-07-17Assigned to "Westermo Network Technologies AB"

Nearby in the registry

The prefixes assigned immediately before and after 00:11:B4:

FAQ

Which company owns MAC address prefix 00:11:B4?: MAC address prefix 00:11:B4 is registered to Westermo Network Technologies AB in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 00:11:B4 has a network interface built by Westermo Network Technologies AB.
What is the OUI 00:11:B4?: 00:11:B4 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Westermo Network Technologies AB. It covers every address from 00:11:B4:00:00:00 to 00:11:B4:FF:FF:FF, or 16,777,216 addresses in total. It is also written 00-11-B4.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 00:11:B4:00:00:00 that is 00:11:B4 — 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 Westermo Network Technologies AB located?: Westermo Network Technologies AB is listed at Stora Sundby Sweden SE SE-640 40 in the IEEE OUI registry entry for 00:11:B4. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does Westermo Network Technologies AB own?: Westermo Network Technologies AB holds 2 OUI prefixes in the IEEE registry, of which 00:11:B4 is one. A device made by Westermo Network Technologies AB could carry a MAC address from any of them.