Which company owns MAC address prefix 70:71:B3?

MAC address prefix 70:71:B3 is registered to Brain Corporation in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 70:71:B3 has a network interface built by Brain Corporation.

What is the OUI 70:71:B3?

70:71:B3 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Brain Corporation. It covers every address from 70:71:B3:00:00:00 to 70:71:B3:FF:FF:FF, or 16,777,216 addresses in total. It is also written 70-71-B3.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 70:71:B3:00:00:00 that is 70:71:B3 — 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 Brain Corporation located?

Brain Corporation is listed at 10182 Telesis Ct UNIT 100 San Diego CA US 92121 in the IEEE OUI registry entry for 70:71:B3. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Brain Corporation

MAC address prefix 70:71:B3 is registered to Brain Corporation in the IEEE OUI registry. Any device whose MAC address begins with 70:71:B3 has a network interface built by Brain 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 70:71:B3:00:00:00 to 70:71:B3:FF:FF:FF.

OUI prefix: 70:71:B3
Hyphen form: 70-71-B3
MAC range: 70:71:B3:00:00:00 – 70:71:B3:FF:FF:FF
Addresses in block: 16,777,216
Organization: Brain Corporation
Address: 10182 Telesis Ct UNIT 100 San Diego CA US 92121
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 "Brain Corporation"
archived source →
2026-07-17Assigned to "Brain Corporation"

Nearby in the registry

The prefixes assigned immediately before and after 70:71:B3:

FAQ

Which company owns MAC address prefix 70:71:B3?: MAC address prefix 70:71:B3 is registered to Brain Corporation in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 70:71:B3 has a network interface built by Brain Corporation.
What is the OUI 70:71:B3?: 70:71:B3 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Brain Corporation. It covers every address from 70:71:B3:00:00:00 to 70:71:B3:FF:FF:FF, or 16,777,216 addresses in total. It is also written 70-71-B3.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 70:71:B3:00:00:00 that is 70:71:B3 — 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 Brain Corporation located?: Brain Corporation is listed at 10182 Telesis Ct UNIT 100 San Diego CA US 92121 in the IEEE OUI registry entry for 70:71:B3. This is the address the organization registered with the IEEE, which may differ from its current operating address.