Which company owns MAC address prefix FC:58:DF?

MAC address prefix FC:58:DF is registered to Interphone Service in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with FC:58:DF has a network interface built by Interphone Service.

What is the OUI FC:58:DF?

FC:58:DF is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Interphone Service. It covers every address from FC:58:DF:00:00:00 to FC:58:DF:FF:FF:FF, or 16,777,216 addresses in total. It is also written FC-58-DF.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in FC:58:DF:00:00:00 that is FC:58:DF — 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 Interphone Service located?

Interphone Service is listed at Inwestorow, 8 Mielec Select a state or province PL 39-300 in the IEEE OUI registry entry for FC:58:DF. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Interphone Service

MAC address prefix FC:58:DF is registered to Interphone Service in the IEEE OUI registry. Any device whose MAC address begins with FC:58:DF has a network interface built by Interphone Service. 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 FC:58:DF:00:00:00 to FC:58:DF:FF:FF:FF.

OUI prefix: FC:58:DF
Hyphen form: FC-58-DF
MAC range: FC:58:DF:00:00:00 – FC:58:DF:FF:FF:FF
Addresses in block: 16,777,216
Organization: Interphone Service
Address: Inwestorow, 8 Mielec Select a state or province PL 39-300
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 "Interphone Service"

Nearby in the registry

The prefixes assigned immediately before and after FC:58:DF:

FAQ

Which company owns MAC address prefix FC:58:DF?: MAC address prefix FC:58:DF is registered to Interphone Service in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with FC:58:DF has a network interface built by Interphone Service.
What is the OUI FC:58:DF?: FC:58:DF is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Interphone Service. It covers every address from FC:58:DF:00:00:00 to FC:58:DF:FF:FF:FF, or 16,777,216 addresses in total. It is also written FC-58-DF.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in FC:58:DF:00:00:00 that is FC:58:DF — 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 Interphone Service located?: Interphone Service is listed at Inwestorow, 8 Mielec Select a state or province PL 39-300 in the IEEE OUI registry entry for FC:58:DF. This is the address the organization registered with the IEEE, which may differ from its current operating address.