Which company owns MAC address prefix 28:B3:AF?

MAC address prefix 28:B3:AF is registered to Qualynxus Inc in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 28:B3:AF has a network interface built by Qualynxus Inc.

What is the OUI 28:B3:AF?

28:B3:AF is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Qualynxus Inc. It covers every address from 28:B3:AF:00:00:00 to 28:B3:AF:FF:FF:FF, or 16,777,216 addresses in total. It is also written 28-B3-AF.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 28:B3:AF:00:00:00 that is 28:B3:AF — 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 Qualynxus Inc located?

Qualynxus Inc is listed at 10080 N Wolfe Road Suite SW3273 Cupertino US 95014 in the IEEE OUI registry entry for 28:B3:AF. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Qualynxus Inc

MAC address prefix 28:B3:AF is registered to Qualynxus Inc in the IEEE OUI registry. Any device whose MAC address begins with 28:B3:AF has a network interface built by Qualynxus Inc. 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 28:B3:AF:00:00:00 to 28:B3:AF:FF:FF:FF.

OUI prefix: 28:B3:AF
Hyphen form: 28-B3-AF
MAC range: 28:B3:AF:00:00:00 – 28:B3:AF:FF:FF:FF
Addresses in block: 16,777,216
Organization: Qualynxus Inc
Address: 10080 N Wolfe Road Suite SW3273 Cupertino US 95014
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 "Qualynxus Inc"
archived source →
2026-07-17Assigned to "Qualynxus Inc"

Nearby in the registry

The prefixes assigned immediately before and after 28:B3:AF:

FAQ

Which company owns MAC address prefix 28:B3:AF?: MAC address prefix 28:B3:AF is registered to Qualynxus Inc in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 28:B3:AF has a network interface built by Qualynxus Inc.
What is the OUI 28:B3:AF?: 28:B3:AF is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Qualynxus Inc. It covers every address from 28:B3:AF:00:00:00 to 28:B3:AF:FF:FF:FF, or 16,777,216 addresses in total. It is also written 28-B3-AF.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 28:B3:AF:00:00:00 that is 28:B3:AF — 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 Qualynxus Inc located?: Qualynxus Inc is listed at 10080 N Wolfe Road Suite SW3273 Cupertino US 95014 in the IEEE OUI registry entry for 28:B3:AF. This is the address the organization registered with the IEEE, which may differ from its current operating address.