Which company owns MAC address prefix 00:12:BB?

MAC address prefix 00:12:BB is registered to Telecommunications Industry Association TR-41 Committee in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 00:12:BB has a network interface built by Telecommunications Industry Association TR-41 Committee.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 00:12:BB:00:00:00 that is 00:12:BB — 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.

Telecommunications Industry Association TR-41 Committee

MAC address prefix 00:12:BB is registered to Telecommunications Industry Association TR-41 Committee in the IEEE OUI registry. Any device whose MAC address begins with 00:12:BB has a network interface built by Telecommunications Industry Association TR-41 Committee. 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 00:12:BB:00:00:00 to 00:12:BB:FF:FF:FF.

OUI prefix: 00:12:BB
Hyphen form: 00-12-BB
MAC range: 00:12:BB:00:00:00 – 00:12:BB:FF:FF:FF
Addresses in block: 16,777,216
Organization: Telecommunications Industry Association TR-41 Committee
Address: 2500 Wilson Blvd., Suite 300 Arlington VA US 22201
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.

2016-07-29Assigned to "Telecommunications Industry Association TR-41 Committee"
archived source →
2026-07-17Assigned to "Telecommunications Industry Association TR-41 Committee"

Nearby in the registry

The prefixes assigned immediately before and after 00:12:BB:

FAQ

Which company owns MAC address prefix 00:12:BB?: MAC address prefix 00:12:BB is registered to Telecommunications Industry Association TR-41 Committee in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 00:12:BB has a network interface built by Telecommunications Industry Association TR-41 Committee.
What is the OUI 00:12:BB?: 00:12:BB is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Telecommunications Industry Association TR-41 Committee. It covers every address from 00:12:BB:00:00:00 to 00:12:BB:FF:FF:FF, or 16,777,216 addresses in total. It is also written 00-12-BB.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 00:12:BB:00:00:00 that is 00:12:BB — 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 Telecommunications Industry Association TR-41 Committee located?: Telecommunications Industry Association TR-41 Committee is listed at 2500 Wilson Blvd., Suite 300 Arlington VA US 22201 in the IEEE OUI registry entry for 00:12:BB. This is the address the organization registered with the IEEE, which may differ from its current operating address.