Which company owns MAC address prefix 4C:74:03?

MAC address prefix 4C:74:03 is registered to BQ in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 4C:74:03 has a network interface built by BQ.

What is the OUI 4C:74:03?

4C:74:03 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to BQ. It covers every address from 4C:74:03:00:00:00 to 4C:74:03:FF:FF:FF, or 16,777,216 addresses in total. It is also written 4C-74-03.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 4C:74:03:00:00:00 that is 4C:74:03 — 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.

BQ is listed at c Sofía 10. Polígono Európolis Las Rozas de Madrid Madrid ES 28230 in the IEEE OUI registry entry for 4C:74:03. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does BQ own?

BQ holds 2 OUI prefixes in the IEEE registry, of which 4C:74:03 is one. A device made by BQ could carry a MAC address from any of them.

BQ

MAC address prefix 4C:74:03 is registered to BQ in the IEEE OUI registry. Any device whose MAC address begins with 4C:74:03 has a network interface built by BQ. 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 4C:74:03:00:00:00 to 4C:74:03:FF:FF:FF.

OUI prefix: 4C:74:03
Hyphen form: 4C-74-03
MAC range: 4C:74:03:00:00:00 – 4C:74:03:FF:FF:FF
Addresses in block: 16,777,216
Organization: BQ
Address: c Sofía 10. Polígono Európolis Las Rozas de Madrid Madrid ES 28230
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 BQ

BQ holds 2 OUI prefixes in total. A device with this exact prefix could just as well carry any of these:

B4:9D:0B

Assignment history (2)

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

2016-07-29Assigned to "BQ"
archived source →
2026-07-17Assigned to "BQ"

Nearby in the registry

The prefixes assigned immediately before and after 4C:74:03:

FAQ

Which company owns MAC address prefix 4C:74:03?: MAC address prefix 4C:74:03 is registered to BQ in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 4C:74:03 has a network interface built by BQ.
What is the OUI 4C:74:03?: 4C:74:03 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to BQ. It covers every address from 4C:74:03:00:00:00 to 4C:74:03:FF:FF:FF, or 16,777,216 addresses in total. It is also written 4C-74-03.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 4C:74:03:00:00:00 that is 4C:74:03 — 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 BQ located?: BQ is listed at c Sofía 10. Polígono Európolis Las Rozas de Madrid Madrid ES 28230 in the IEEE OUI registry entry for 4C:74:03. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does BQ own?: BQ holds 2 OUI prefixes in the IEEE registry, of which 4C:74:03 is one. A device made by BQ could carry a MAC address from any of them.