Which company owns MAC address prefix 54:73:70?

MAC address prefix 54:73:70 is registered to The LEGO Group in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 54:73:70 has a network interface built by The LEGO Group.

What is the OUI 54:73:70?

54:73:70 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to The LEGO Group. It covers every address from 54:73:70:00:00:00 to 54:73:70:FF:FF:FF, or 16,777,216 addresses in total. It is also written 54-73-70.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 54:73:70:00:00:00 that is 54:73:70 — 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 The LEGO Group located?

The LEGO Group is listed at Åstvej 1 7190 Billund Denmark Billund Jylland DK 7190 in the IEEE OUI registry entry for 54:73:70. This is the address the organization registered with the IEEE, which may differ from its current operating address.

The LEGO Group

MAC address prefix 54:73:70 is registered to The LEGO Group in the IEEE OUI registry. Any device whose MAC address begins with 54:73:70 has a network interface built by The LEGO Group. 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 54:73:70:00:00:00 to 54:73:70:FF:FF:FF.

OUI prefix: 54:73:70
Hyphen form: 54-73-70
MAC range: 54:73:70:00:00:00 – 54:73:70:FF:FF:FF
Addresses in block: 16,777,216
Organization: The LEGO Group
Address: Åstvej 1 7190 Billund Denmark Billund Jylland DK 7190
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.

2026-06-20Assigned to "The LEGO Group"
archived source →
2026-07-17Assigned to "The LEGO Group"

Nearby in the registry

The prefixes assigned immediately before and after 54:73:70:

FAQ

Which company owns MAC address prefix 54:73:70?: MAC address prefix 54:73:70 is registered to The LEGO Group in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 54:73:70 has a network interface built by The LEGO Group.
What is the OUI 54:73:70?: 54:73:70 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to The LEGO Group. It covers every address from 54:73:70:00:00:00 to 54:73:70:FF:FF:FF, or 16,777,216 addresses in total. It is also written 54-73-70.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 54:73:70:00:00:00 that is 54:73:70 — 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 The LEGO Group located?: The LEGO Group is listed at Åstvej 1 7190 Billund Denmark Billund Jylland DK 7190 in the IEEE OUI registry entry for 54:73:70. This is the address the organization registered with the IEEE, which may differ from its current operating address.