Which company owns MAC address prefix 5C:3B:35?

MAC address prefix 5C:3B:35 is registered to Gehirn Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 5C:3B:35 has a network interface built by Gehirn Inc..

What is the OUI 5C:3B:35?

5C:3B:35 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Gehirn Inc.. It covers every address from 5C:3B:35:00:00:00 to 5C:3B:35:FF:FF:FF, or 16,777,216 addresses in total. It is also written 5C-3B-35.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 5C:3B:35:00:00:00 that is 5C:3B:35 — 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 Gehirn Inc. located?

Gehirn Inc. is listed at 1-3-6 Kudan-kita Chiyoda Tokyo JP 102-0073 in the IEEE OUI registry entry for 5C:3B:35. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Gehirn Inc.

MAC address prefix 5C:3B:35 is registered to Gehirn Inc. in the IEEE OUI registry. Any device whose MAC address begins with 5C:3B:35 has a network interface built by Gehirn 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 5C:3B:35:00:00:00 to 5C:3B:35:FF:FF:FF.

OUI prefix: 5C:3B:35
Hyphen form: 5C-3B-35
MAC range: 5C:3B:35:00:00:00 – 5C:3B:35:FF:FF:FF
Addresses in block: 16,777,216
Organization: Gehirn Inc.
Address: 1-3-6 Kudan-kita Chiyoda Tokyo JP 102-0073
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 "Gehirn Inc."
archived source →
2026-07-17Assigned to "Gehirn Inc."

Nearby in the registry

The prefixes assigned immediately before and after 5C:3B:35:

FAQ

Which company owns MAC address prefix 5C:3B:35?: MAC address prefix 5C:3B:35 is registered to Gehirn Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 5C:3B:35 has a network interface built by Gehirn Inc..
What is the OUI 5C:3B:35?: 5C:3B:35 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Gehirn Inc.. It covers every address from 5C:3B:35:00:00:00 to 5C:3B:35:FF:FF:FF, or 16,777,216 addresses in total. It is also written 5C-3B-35.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 5C:3B:35:00:00:00 that is 5C:3B:35 — 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 Gehirn Inc. located?: Gehirn Inc. is listed at 1-3-6 Kudan-kita Chiyoda Tokyo JP 102-0073 in the IEEE OUI registry entry for 5C:3B:35. This is the address the organization registered with the IEEE, which may differ from its current operating address.