Which company owns MAC address prefix F0:4A:3D?

MAC address prefix F0:4A:3D is registered to Bosch Thermotechnik GmbH in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with F0:4A:3D has a network interface built by Bosch Thermotechnik GmbH.

What is the OUI F0:4A:3D?

F0:4A:3D is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Bosch Thermotechnik GmbH. It covers every address from F0:4A:3D:00:00:00 to F0:4A:3D:FF:FF:FF, or 16,777,216 addresses in total. It is also written F0-4A-3D.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in F0:4A:3D:00:00:00 that is F0:4A:3D — 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 Bosch Thermotechnik GmbH located?

Bosch Thermotechnik GmbH is listed at Sophienstraße 30-32 Wetzlar DE 35576 in the IEEE OUI registry entry for F0:4A:3D. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Bosch Thermotechnik GmbH

MAC address prefix F0:4A:3D is registered to Bosch Thermotechnik GmbH in the IEEE OUI registry. Any device whose MAC address begins with F0:4A:3D has a network interface built by Bosch Thermotechnik GmbH. 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 F0:4A:3D:00:00:00 to F0:4A:3D:FF:FF:FF.

OUI prefix: F0:4A:3D
Hyphen form: F0-4A-3D
MAC range: F0:4A:3D:00:00:00 – F0:4A:3D:FF:FF:FF
Addresses in block: 16,777,216
Organization: Bosch Thermotechnik GmbH
Address: Sophienstraße 30-32 Wetzlar DE 35576
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 "Bosch Thermotechnik GmbH"

Nearby in the registry

The prefixes assigned immediately before and after F0:4A:3D:

FAQ

Which company owns MAC address prefix F0:4A:3D?: MAC address prefix F0:4A:3D is registered to Bosch Thermotechnik GmbH in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with F0:4A:3D has a network interface built by Bosch Thermotechnik GmbH.
What is the OUI F0:4A:3D?: F0:4A:3D is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Bosch Thermotechnik GmbH. It covers every address from F0:4A:3D:00:00:00 to F0:4A:3D:FF:FF:FF, or 16,777,216 addresses in total. It is also written F0-4A-3D.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in F0:4A:3D:00:00:00 that is F0:4A:3D — 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 Bosch Thermotechnik GmbH located?: Bosch Thermotechnik GmbH is listed at Sophienstraße 30-32 Wetzlar DE 35576 in the IEEE OUI registry entry for F0:4A:3D. This is the address the organization registered with the IEEE, which may differ from its current operating address.