Which company owns MAC address prefix EC:1B:CF?

MAC address prefix EC:1B:CF is registered to Brain Technologies, Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with EC:1B:CF has a network interface built by Brain Technologies, Inc..

What is the OUI EC:1B:CF?

EC:1B:CF is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Brain Technologies, Inc.. It covers every address from EC:1B:CF:00:00:00 to EC:1B:CF:FF:FF:FF, or 16,777,216 addresses in total. It is also written EC-1B-CF.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in EC:1B:CF:00:00:00 that is EC:1B:CF — 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 Technologies, Inc. located?

Brain Technologies, Inc. is listed at 2121 S El Camino Real Floor 9 San Mateo CA US 94403 in the IEEE OUI registry entry for EC:1B:CF. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Brain Technologies, Inc.

MAC address prefix EC:1B:CF is registered to Brain Technologies, Inc. in the IEEE OUI registry. Any device whose MAC address begins with EC:1B:CF has a network interface built by Brain Technologies, 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 EC:1B:CF:00:00:00 to EC:1B:CF:FF:FF:FF.

OUI prefix: EC:1B:CF
Hyphen form: EC-1B-CF
MAC range: EC:1B:CF:00:00:00 – EC:1B:CF:FF:FF:FF
Addresses in block: 16,777,216
Organization: Brain Technologies, Inc.
Address: 2121 S El Camino Real Floor 9 San Mateo CA US 94403
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.

2025-02-27Assigned to "Brain Technologies, Inc."
archived source →
2026-07-17Assigned to "Brain Technologies, Inc."

Nearby in the registry

The prefixes assigned immediately before and after EC:1B:CF:

FAQ

Which company owns MAC address prefix EC:1B:CF?: MAC address prefix EC:1B:CF is registered to Brain Technologies, Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with EC:1B:CF has a network interface built by Brain Technologies, Inc..
What is the OUI EC:1B:CF?: EC:1B:CF is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Brain Technologies, Inc.. It covers every address from EC:1B:CF:00:00:00 to EC:1B:CF:FF:FF:FF, or 16,777,216 addresses in total. It is also written EC-1B-CF.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in EC:1B:CF:00:00:00 that is EC:1B:CF — 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 Technologies, Inc. located?: Brain Technologies, Inc. is listed at 2121 S El Camino Real Floor 9 San Mateo CA US 94403 in the IEEE OUI registry entry for EC:1B:CF. This is the address the organization registered with the IEEE, which may differ from its current operating address.