Which company owns MAC address prefix B4:E0:CD?

MAC address prefix B4:E0:CD is registered to Fusion-io, Inc in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with B4:E0:CD has a network interface built by Fusion-io, Inc.

What is the OUI B4:E0:CD?

B4:E0:CD is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Fusion-io, Inc. It covers every address from B4:E0:CD:00:00:00 to B4:E0:CD:FF:FF:FF, or 16,777,216 addresses in total. It is also written B4-E0-CD.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in B4:E0:CD:00:00:00 that is B4:E0:CD — 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 Fusion-io, Inc located?

Fusion-io, Inc is listed at 2880 Junction Avenue San Jose CA US 95134-1922 in the IEEE OUI registry entry for B4:E0:CD. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Fusion-io, Inc

MAC address prefix B4:E0:CD is registered to Fusion-io, Inc in the IEEE OUI registry. Any device whose MAC address begins with B4:E0:CD has a network interface built by Fusion-io, Inc. 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 B4:E0:CD:00:00:00 to B4:E0:CD:FF:FF:FF.

OUI prefix: B4:E0:CD
Hyphen form: B4-E0-CD
MAC range: B4:E0:CD:00:00:00 – B4:E0:CD:FF:FF:FF
Addresses in block: 16,777,216
Organization: Fusion-io, Inc
Address: 2880 Junction Avenue San Jose CA US 95134-1922
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 "Fusion-io, Inc"
archived source →
2026-07-17Assigned to "Fusion-io, Inc"

Nearby in the registry

The prefixes assigned immediately before and after B4:E0:CD:

FAQ

Which company owns MAC address prefix B4:E0:CD?: MAC address prefix B4:E0:CD is registered to Fusion-io, Inc in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with B4:E0:CD has a network interface built by Fusion-io, Inc.
What is the OUI B4:E0:CD?: B4:E0:CD is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Fusion-io, Inc. It covers every address from B4:E0:CD:00:00:00 to B4:E0:CD:FF:FF:FF, or 16,777,216 addresses in total. It is also written B4-E0-CD.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in B4:E0:CD:00:00:00 that is B4:E0:CD — 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 Fusion-io, Inc located?: Fusion-io, Inc is listed at 2880 Junction Avenue San Jose CA US 95134-1922 in the IEEE OUI registry entry for B4:E0:CD. This is the address the organization registered with the IEEE, which may differ from its current operating address.