Which company owns MAC address prefix CC:F9:57?

MAC address prefix CC:F9:57 is registered to u-blox AG in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with CC:F9:57 has a network interface built by u-blox AG.

What is the OUI CC:F9:57?

CC:F9:57 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 CC:F9:57:00:00:00 to CC:F9:57:FF:FF:FF, or 16,777,216 addresses in total. It is also written CC-F9-57.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in CC:F9:57:00:00:00 that is CC:F9:57 — 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 CH 8800 in the IEEE OUI registry entry for CC:F9:57. 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 CC:F9:57 is one. A device made by u-blox AG could carry a MAC address from any of them.

u-blox AG

MAC address prefix CC:F9:57 is registered to u-blox AG in the IEEE OUI registry. Any device whose MAC address begins with CC:F9:57 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 CC:F9:57:00:00:00 to CC:F9:57:FF:FF:FF.

OUI prefix: CC:F9:57
Hyphen form: CC-F9-57
MAC range: CC:F9:57:00:00:00 – CC:F9:57:FF:FF:FF
Addresses in block: 16,777,216
Organization: u-blox AG
Address: Zuercherstrasse 68 Thalwil 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.

2017-09-08Assigned to "u-blox AG"
archived source →
2026-07-17Assigned to "u-blox AG"

Nearby in the registry

The prefixes assigned immediately before and after CC:F9:57:

FAQ

Which company owns MAC address prefix CC:F9:57?: MAC address prefix CC:F9:57 is registered to u-blox AG in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with CC:F9:57 has a network interface built by u-blox AG.
What is the OUI CC:F9:57?: CC:F9:57 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 CC:F9:57:00:00:00 to CC:F9:57:FF:FF:FF, or 16,777,216 addresses in total. It is also written CC-F9-57.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in CC:F9:57:00:00:00 that is CC:F9:57 — 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 CH 8800 in the IEEE OUI registry entry for CC:F9:57. 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 CC:F9:57 is one. A device made by u-blox AG could carry a MAC address from any of them.