Which company owns MAC address prefix B8:F4:4F?

MAC address prefix B8:F4:4F is registered to u-blox AG in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with B8:F4:4F has a network interface built by u-blox AG.

What is the OUI B8:F4:4F?

B8:F4:4F is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to u-blox AG. It covers every address from B8:F4:4F:00:00:00 to B8:F4:4F:FF:FF:FF, or 16,777,216 addresses in total. It is also written B8-F4-4F.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in B8:F4:4F:00:00:00 that is B8:F4:4F — 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 u-blox AG located?

u-blox AG is listed at Zuercherstrasse, 68 Thalwil Switzerland CH CH-8800 in the IEEE OUI registry entry for B8:F4:4F. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does u-blox AG own?

u-blox AG holds 11 OUI prefixes in the IEEE registry, of which B8:F4:4F is one. A device made by u-blox AG could carry a MAC address from any of them.

u-blox AG

MAC address prefix B8:F4:4F is registered to u-blox AG in the IEEE OUI registry. Any device whose MAC address begins with B8:F4:4F has a network interface built by u-blox AG. 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 B8:F4:4F:00:00:00 to B8:F4:4F:FF:FF:FF.

OUI prefix: B8:F4:4F
Hyphen form: B8-F4-4F
MAC range: B8:F4:4F:00:00:00 – B8:F4:4F:FF:FF:FF
Addresses in block: 16,777,216
Organization: u-blox AG
Address: Zuercherstrasse, 68 Thalwil Switzerland CH CH-8800
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 u-blox AG

u-blox AG holds 11 OUI prefixes in total. A device with this exact prefix could just as well carry any of these:

Assignment history (2)

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

2023-07-11Assigned to "u-blox AG"
archived source →
2026-07-17Assigned to "u-blox AG"

Nearby in the registry

The prefixes assigned immediately before and after B8:F4:4F:

FAQ

Which company owns MAC address prefix B8:F4:4F?: MAC address prefix B8:F4:4F is registered to u-blox AG in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with B8:F4:4F has a network interface built by u-blox AG.
What is the OUI B8:F4:4F?: B8:F4:4F is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to u-blox AG. It covers every address from B8:F4:4F:00:00:00 to B8:F4:4F:FF:FF:FF, or 16,777,216 addresses in total. It is also written B8-F4-4F.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in B8:F4:4F:00:00:00 that is B8:F4:4F — 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 u-blox AG located?: u-blox AG is listed at Zuercherstrasse, 68 Thalwil Switzerland CH CH-8800 in the IEEE OUI registry entry for B8:F4:4F. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does u-blox AG own?: u-blox AG holds 11 OUI prefixes in the IEEE registry, of which B8:F4:4F is one. A device made by u-blox AG could carry a MAC address from any of them.