Which company owns MAC address prefix A4:B1:E9?

MAC address prefix A4:B1:E9 is registered to Vantiva Technologies Belgium in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with A4:B1:E9 has a network interface built by Vantiva Technologies Belgium.

What is the OUI A4:B1:E9?

A4:B1:E9 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Vantiva Technologies Belgium. It covers every address from A4:B1:E9:00:00:00 to A4:B1:E9:FF:FF:FF, or 16,777,216 addresses in total. It is also written A4-B1-E9.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in A4:B1:E9:00:00:00 that is A4:B1:E9 — 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 Vantiva Technologies Belgium located?

Vantiva Technologies Belgium is listed at Prins Boudewijnlaan 47 Edegem - Belgium BE B-2650 in the IEEE OUI registry entry for A4:B1:E9. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does Vantiva Technologies Belgium own?

Vantiva Technologies Belgium holds 12 OUI prefixes in the IEEE registry, of which A4:B1:E9 is one. A device made by Vantiva Technologies Belgium could carry a MAC address from any of them.

Vantiva Technologies Belgium

MAC address prefix A4:B1:E9 is registered to Vantiva Technologies Belgium in the IEEE OUI registry. Any device whose MAC address begins with A4:B1:E9 has a network interface built by Vantiva Technologies Belgium. 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 A4:B1:E9:00:00:00 to A4:B1:E9:FF:FF:FF.

OUI prefix: A4:B1:E9
Hyphen form: A4-B1-E9
MAC range: A4:B1:E9:00:00:00 – A4:B1:E9:FF:FF:FF
Addresses in block: 16,777,216
Organization: Vantiva Technologies Belgium
Address: Prins Boudewijnlaan 47 Edegem - Belgium BE B-2650
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 Vantiva Technologies Belgium

Vantiva Technologies Belgium holds 12 OUI prefixes in total. A device with this exact prefix could just as well carry any of these:

Assignment history (4)

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 "Technicolor"
archived source →
2021-06-10Renamed from "Technicolor" to "Technicolor Delivery Technologies Belgium NV"
archived source →
2026-01-08Renamed from "Technicolor Delivery Technologies Belgium NV" to "Vantiva Technologies Belgium"
archived source →
2026-07-17Assigned to "Vantiva Technologies Belgium"

Nearby in the registry

The prefixes assigned immediately before and after A4:B1:E9:

FAQ

Which company owns MAC address prefix A4:B1:E9?: MAC address prefix A4:B1:E9 is registered to Vantiva Technologies Belgium in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with A4:B1:E9 has a network interface built by Vantiva Technologies Belgium.
What is the OUI A4:B1:E9?: A4:B1:E9 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Vantiva Technologies Belgium. It covers every address from A4:B1:E9:00:00:00 to A4:B1:E9:FF:FF:FF, or 16,777,216 addresses in total. It is also written A4-B1-E9.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in A4:B1:E9:00:00:00 that is A4:B1:E9 — 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 Vantiva Technologies Belgium located?: Vantiva Technologies Belgium is listed at Prins Boudewijnlaan 47 Edegem - Belgium BE B-2650 in the IEEE OUI registry entry for A4:B1:E9. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does Vantiva Technologies Belgium own?: Vantiva Technologies Belgium holds 12 OUI prefixes in the IEEE registry, of which A4:B1:E9 is one. A device made by Vantiva Technologies Belgium could carry a MAC address from any of them.