Which company owns MAC address prefix 74:5F:90?

MAC address prefix 74:5F:90 is registered to LAM Technologies in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 74:5F:90 has a network interface built by LAM Technologies.

What is the OUI 74:5F:90?

74:5F:90 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to LAM Technologies. It covers every address from 74:5F:90:00:00:00 to 74:5F:90:FF:FF:FF, or 16,777,216 addresses in total. It is also written 74-5F-90.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 74:5F:90:00:00:00 that is 74:5F:90 — 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 LAM Technologies located?

LAM Technologies is listed at Viale Ludovico Ariosto, 492/D Sesto Fiorentino FIRENZE IT 50019 in the IEEE OUI registry entry for 74:5F:90. This is the address the organization registered with the IEEE, which may differ from its current operating address.

LAM Technologies

MAC address prefix 74:5F:90 is registered to LAM Technologies in the IEEE OUI registry. Any device whose MAC address begins with 74:5F:90 has a network interface built by LAM Technologies. 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 74:5F:90:00:00:00 to 74:5F:90:FF:FF:FF.

OUI prefix: 74:5F:90
Hyphen form: 74-5F-90
MAC range: 74:5F:90:00:00:00 – 74:5F:90:FF:FF:FF
Addresses in block: 16,777,216
Organization: LAM Technologies
Address: Viale Ludovico Ariosto, 492/D Sesto Fiorentino FIRENZE IT 50019
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.

2018-12-21Assigned to "LAM Technologies"
archived source →
2026-07-17Assigned to "LAM Technologies"

Nearby in the registry

The prefixes assigned immediately before and after 74:5F:90:

FAQ

Which company owns MAC address prefix 74:5F:90?: MAC address prefix 74:5F:90 is registered to LAM Technologies in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 74:5F:90 has a network interface built by LAM Technologies.
What is the OUI 74:5F:90?: 74:5F:90 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to LAM Technologies. It covers every address from 74:5F:90:00:00:00 to 74:5F:90:FF:FF:FF, or 16,777,216 addresses in total. It is also written 74-5F-90.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 74:5F:90:00:00:00 that is 74:5F:90 — 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 LAM Technologies located?: LAM Technologies is listed at Viale Ludovico Ariosto, 492/D Sesto Fiorentino FIRENZE IT 50019 in the IEEE OUI registry entry for 74:5F:90. This is the address the organization registered with the IEEE, which may differ from its current operating address.