Which company owns MAC address prefix 28:11:A5?

MAC address prefix 28:11:A5 is registered to Bose Corporation in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 28:11:A5 has a network interface built by Bose Corporation.

What is the OUI 28:11:A5?

28:11:A5 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Bose Corporation. It covers every address from 28:11:A5:00:00:00 to 28:11:A5:FF:FF:FF, or 16,777,216 addresses in total. It is also written 28-11-A5.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 28:11:A5:00:00:00 that is 28:11:A5 — 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 Bose Corporation located?

Bose Corporation is listed at The Mountain Framingham MA US 01701-9168 in the IEEE OUI registry entry for 28:11:A5. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does Bose Corporation own?

Bose Corporation holds 14 OUI prefixes in the IEEE registry, of which 28:11:A5 is one. A device made by Bose Corporation could carry a MAC address from any of them.

Bose Corporation

MAC address prefix 28:11:A5 is registered to Bose Corporation in the IEEE OUI registry. Any device whose MAC address begins with 28:11:A5 has a network interface built by Bose Corporation. 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 28:11:A5:00:00:00 to 28:11:A5:FF:FF:FF.

OUI prefix: 28:11:A5
Hyphen form: 28-11-A5
MAC range: 28:11:A5:00:00:00 – 28:11:A5:FF:FF:FF
Addresses in block: 16,777,216
Organization: Bose Corporation
Address: The Mountain Framingham MA US 01701-9168
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.

Other prefixes from Bose Corporation

Bose Corporation holds 14 OUI prefixes in total. A device with this exact prefix could just as well carry any of these:

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 "Bose Corporation"
archived source →
2026-07-17Assigned to "Bose Corporation"

Nearby in the registry

The prefixes assigned immediately before and after 28:11:A5:

FAQ

Which company owns MAC address prefix 28:11:A5?: MAC address prefix 28:11:A5 is registered to Bose Corporation in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 28:11:A5 has a network interface built by Bose Corporation.
What is the OUI 28:11:A5?: 28:11:A5 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Bose Corporation. It covers every address from 28:11:A5:00:00:00 to 28:11:A5:FF:FF:FF, or 16,777,216 addresses in total. It is also written 28-11-A5.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 28:11:A5:00:00:00 that is 28:11:A5 — 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 Bose Corporation located?: Bose Corporation is listed at The Mountain Framingham MA US 01701-9168 in the IEEE OUI registry entry for 28:11:A5. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does Bose Corporation own?: Bose Corporation holds 14 OUI prefixes in the IEEE registry, of which 28:11:A5 is one. A device made by Bose Corporation could carry a MAC address from any of them.