Which company owns MAC address prefix 44:9F:79?

MAC address prefix 44:9F:79 is registered to onsemi in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 44:9F:79 has a network interface built by onsemi.

What is the OUI 44:9F:79?

44:9F:79 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to onsemi. It covers every address from 44:9F:79:00:00:00 to 44:9F:79:FF:FF:FF, or 16,777,216 addresses in total. It is also written 44-9F-79.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 44:9F:79:00:00:00 that is 44:9F:79 — 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 onsemi located?

onsemi is listed at 5701 N Pima Rd Scottsdale AZ US 85250 in the IEEE OUI registry entry for 44:9F:79. This is the address the organization registered with the IEEE, which may differ from its current operating address.

onsemi

MAC address prefix 44:9F:79 is registered to onsemi in the IEEE OUI registry. Any device whose MAC address begins with 44:9F:79 has a network interface built by onsemi. 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 44:9F:79:00:00:00 to 44:9F:79:FF:FF:FF.

OUI prefix: 44:9F:79
Hyphen form: 44-9F-79
MAC range: 44:9F:79:00:00:00 – 44:9F:79:FF:FF:FF
Addresses in block: 16,777,216
Organization: onsemi
Address: 5701 N Pima Rd Scottsdale AZ US 85250
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.

2026-02-17Assigned to "onsemi"
archived source →
2026-07-17Assigned to "onsemi"

Nearby in the registry

The prefixes assigned immediately before and after 44:9F:79:

FAQ

Which company owns MAC address prefix 44:9F:79?: MAC address prefix 44:9F:79 is registered to onsemi in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 44:9F:79 has a network interface built by onsemi.
What is the OUI 44:9F:79?: 44:9F:79 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to onsemi. It covers every address from 44:9F:79:00:00:00 to 44:9F:79:FF:FF:FF, or 16,777,216 addresses in total. It is also written 44-9F-79.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 44:9F:79:00:00:00 that is 44:9F:79 — 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 onsemi located?: onsemi is listed at 5701 N Pima Rd Scottsdale AZ US 85250 in the IEEE OUI registry entry for 44:9F:79. This is the address the organization registered with the IEEE, which may differ from its current operating address.