Which company owns MAC address prefix E4:F1:4C?

MAC address prefix E4:F1:4C is registered to Private in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with E4:F1:4C has a network interface built by Private.

What is the OUI E4:F1:4C?

E4:F1:4C is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Private. It covers every address from E4:F1:4C:00:00:00 to E4:F1:4C:FF:FF:FF, or 16,777,216 addresses in total. It is also written E4-F1-4C.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in E4:F1:4C:00:00:00 that is E4:F1:4C — 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.

Private

MAC address prefix E4:F1:4C is registered to Private in the IEEE OUI registry. Any device whose MAC address begins with E4:F1:4C has a network interface built by Private. 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 E4:F1:4C:00:00:00 to E4:F1:4C:FF:FF:FF.

OUI prefix: E4:F1:4C
Hyphen form: E4-F1-4C
MAC range: E4:F1:4C:00:00:00 – E4:F1:4C:FF:FF:FF
Addresses in block: 16,777,216
Organization: Private
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 (1)

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

2026-07-17Assigned to "Private"

Nearby in the registry

The prefixes assigned immediately before and after E4:F1:4C:

FAQ

Which company owns MAC address prefix E4:F1:4C?: MAC address prefix E4:F1:4C is registered to Private in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with E4:F1:4C has a network interface built by Private.
What is the OUI E4:F1:4C?: E4:F1:4C is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Private. It covers every address from E4:F1:4C:00:00:00 to E4:F1:4C:FF:FF:FF, or 16,777,216 addresses in total. It is also written E4-F1-4C.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in E4:F1:4C:00:00:00 that is E4:F1:4C — 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.