Which company owns MAC address prefix 04:F5:F4?

MAC address prefix 04:F5:F4 is registered to Proxim Wireless in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 04:F5:F4 has a network interface built by Proxim Wireless.

What is the OUI 04:F5:F4?

04:F5:F4 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Proxim Wireless. It covers every address from 04:F5:F4:00:00:00 to 04:F5:F4:FF:FF:FF, or 16,777,216 addresses in total. It is also written 04-F5-F4.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 04:F5:F4:00:00:00 that is 04:F5:F4 — 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 Proxim Wireless located?

Proxim Wireless is listed at 2114 Ringwood Ave San Jose CA US 95131 in the IEEE OUI registry entry for 04:F5:F4. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does Proxim Wireless own?

Proxim Wireless holds 2 OUI prefixes in the IEEE registry, of which 04:F5:F4 is one. A device made by Proxim Wireless could carry a MAC address from any of them.

Proxim Wireless

MAC address prefix 04:F5:F4 is registered to Proxim Wireless in the IEEE OUI registry. Any device whose MAC address begins with 04:F5:F4 has a network interface built by Proxim Wireless. 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 04:F5:F4:00:00:00 to 04:F5:F4:FF:FF:FF.

OUI prefix: 04:F5:F4
Hyphen form: 04-F5-F4
MAC range: 04:F5:F4:00:00:00 – 04:F5:F4:FF:FF:FF
Addresses in block: 16,777,216
Organization: Proxim Wireless
Address: 2114 Ringwood Ave San Jose CA US 95131
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 Proxim Wireless

Proxim Wireless holds 2 OUI prefixes in total. A device with this exact prefix could just as well carry any of these:

00:20:A6

Assignment history (2)

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

2020-03-21Assigned to "Proxim Wireless"
archived source →
2026-07-17Assigned to "Proxim Wireless"

Nearby in the registry

The prefixes assigned immediately before and after 04:F5:F4:

FAQ

Which company owns MAC address prefix 04:F5:F4?: MAC address prefix 04:F5:F4 is registered to Proxim Wireless in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 04:F5:F4 has a network interface built by Proxim Wireless.
What is the OUI 04:F5:F4?: 04:F5:F4 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Proxim Wireless. It covers every address from 04:F5:F4:00:00:00 to 04:F5:F4:FF:FF:FF, or 16,777,216 addresses in total. It is also written 04-F5-F4.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 04:F5:F4:00:00:00 that is 04:F5:F4 — 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 Proxim Wireless located?: Proxim Wireless is listed at 2114 Ringwood Ave San Jose CA US 95131 in the IEEE OUI registry entry for 04:F5:F4. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does Proxim Wireless own?: Proxim Wireless holds 2 OUI prefixes in the IEEE registry, of which 04:F5:F4 is one. A device made by Proxim Wireless could carry a MAC address from any of them.