Which company owns MAC address prefix 40:BC:73?

MAC address prefix 40:BC:73 is registered to Cronoplast S.L. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 40:BC:73 has a network interface built by Cronoplast S.L..

What is the OUI 40:BC:73?

40:BC:73 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Cronoplast S.L.. It covers every address from 40:BC:73:00:00:00 to 40:BC:73:FF:FF:FF, or 16,777,216 addresses in total. It is also written 40-BC-73.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 40:BC:73:00:00:00 that is 40:BC:73 — 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 Cronoplast S.L. located?

Cronoplast S.L. is listed at Pol.Ind.S.Ermengol II - ABRERA BARCELONA ES 08630 in the IEEE OUI registry entry for 40:BC:73. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Cronoplast S.L.

MAC address prefix 40:BC:73 is registered to Cronoplast S.L. in the IEEE OUI registry. Any device whose MAC address begins with 40:BC:73 has a network interface built by Cronoplast S.L.. 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 40:BC:73:00:00:00 to 40:BC:73:FF:FF:FF.

OUI prefix: 40:BC:73
Hyphen form: 40-BC-73
MAC range: 40:BC:73:00:00:00 – 40:BC:73:FF:FF:FF
Addresses in block: 16,777,216
Organization: Cronoplast S.L.
Address: Pol.Ind.S.Ermengol II - ABRERA BARCELONA ES 08630
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.

2016-07-29Assigned to "Cronoplast S.L."
archived source →
2026-07-17Assigned to "Cronoplast S.L."

Nearby in the registry

The prefixes assigned immediately before and after 40:BC:73:

FAQ

Which company owns MAC address prefix 40:BC:73?: MAC address prefix 40:BC:73 is registered to Cronoplast S.L. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 40:BC:73 has a network interface built by Cronoplast S.L..
What is the OUI 40:BC:73?: 40:BC:73 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Cronoplast S.L.. It covers every address from 40:BC:73:00:00:00 to 40:BC:73:FF:FF:FF, or 16,777,216 addresses in total. It is also written 40-BC-73.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 40:BC:73:00:00:00 that is 40:BC:73 — 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 Cronoplast S.L. located?: Cronoplast S.L. is listed at Pol.Ind.S.Ermengol II - ABRERA BARCELONA ES 08630 in the IEEE OUI registry entry for 40:BC:73. This is the address the organization registered with the IEEE, which may differ from its current operating address.