Which company owns MAC address prefix 3C:F3:41?

MAC address prefix 3C:F3:41 is registered to Hosenso GmbH & Co. KG in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 3C:F3:41 has a network interface built by Hosenso GmbH & Co. KG.

What is the OUI 3C:F3:41?

3C:F3:41 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Hosenso GmbH & Co. KG. It covers every address from 3C:F3:41:00:00:00 to 3C:F3:41:FF:FF:FF, or 16,777,216 addresses in total. It is also written 3C-F3-41.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 3C:F3:41:00:00:00 that is 3C:F3:41 — 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 Hosenso GmbH & Co. KG located?

Hosenso GmbH & Co. KG is listed at Robert-Bosch-Str. 9 Neu Wulmstorf DE 21629 in the IEEE OUI registry entry for 3C:F3:41. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Hosenso GmbH & Co. KG

MAC address prefix 3C:F3:41 is registered to Hosenso GmbH & Co. KG in the IEEE OUI registry. Any device whose MAC address begins with 3C:F3:41 has a network interface built by Hosenso GmbH & Co. KG. 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 3C:F3:41:00:00:00 to 3C:F3:41:FF:FF:FF.

OUI prefix: 3C:F3:41
Hyphen form: 3C-F3-41
MAC range: 3C:F3:41:00:00:00 – 3C:F3:41:FF:FF:FF
Addresses in block: 16,777,216
Organization: Hosenso GmbH & Co. KG
Address: Robert-Bosch-Str. 9 Neu Wulmstorf DE 21629
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.

2024-11-20Assigned to "Hosenso GmbH & Co. KG"
archived source →
2026-07-17Assigned to "Hosenso GmbH & Co. KG"

Nearby in the registry

The prefixes assigned immediately before and after 3C:F3:41:

FAQ

Which company owns MAC address prefix 3C:F3:41?: MAC address prefix 3C:F3:41 is registered to Hosenso GmbH & Co. KG in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 3C:F3:41 has a network interface built by Hosenso GmbH & Co. KG.
What is the OUI 3C:F3:41?: 3C:F3:41 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Hosenso GmbH & Co. KG. It covers every address from 3C:F3:41:00:00:00 to 3C:F3:41:FF:FF:FF, or 16,777,216 addresses in total. It is also written 3C-F3-41.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 3C:F3:41:00:00:00 that is 3C:F3:41 — 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 Hosenso GmbH & Co. KG located?: Hosenso GmbH & Co. KG is listed at Robert-Bosch-Str. 9 Neu Wulmstorf DE 21629 in the IEEE OUI registry entry for 3C:F3:41. This is the address the organization registered with the IEEE, which may differ from its current operating address.