Which company owns MAC address prefix 4C:54:8B?

MAC address prefix 4C:54:8B is registered to Cerebras System Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 4C:54:8B has a network interface built by Cerebras System Inc..

What is the OUI 4C:54:8B?

4C:54:8B is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Cerebras System Inc.. It covers every address from 4C:54:8B:00:00:00 to 4C:54:8B:FF:FF:FF, or 16,777,216 addresses in total. It is also written 4C-54-8B.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 4C:54:8B:00:00:00 that is 4C:54:8B — 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 Cerebras System Inc. located?

Cerebras System Inc. is listed at 1237 E Arques Ave Sunnyvale CA US 94085-4701 in the IEEE OUI registry entry for 4C:54:8B. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Cerebras System Inc.

MAC address prefix 4C:54:8B is registered to Cerebras System Inc. in the IEEE OUI registry. Any device whose MAC address begins with 4C:54:8B has a network interface built by Cerebras System 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 4C:54:8B:00:00:00 to 4C:54:8B:FF:FF:FF.

OUI prefix: 4C:54:8B
Hyphen form: 4C-54-8B
MAC range: 4C:54:8B:00:00:00 – 4C:54:8B:FF:FF:FF
Addresses in block: 16,777,216
Organization: Cerebras System Inc.
Address: 1237 E Arques Ave Sunnyvale CA US 94085-4701
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.

2026-06-20Assigned to "Cerebras System Inc."
archived source →
2026-07-17Assigned to "Cerebras System Inc."

Nearby in the registry

The prefixes assigned immediately before and after 4C:54:8B:

FAQ

Which company owns MAC address prefix 4C:54:8B?: MAC address prefix 4C:54:8B is registered to Cerebras System Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 4C:54:8B has a network interface built by Cerebras System Inc..
What is the OUI 4C:54:8B?: 4C:54:8B is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Cerebras System Inc.. It covers every address from 4C:54:8B:00:00:00 to 4C:54:8B:FF:FF:FF, or 16,777,216 addresses in total. It is also written 4C-54-8B.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 4C:54:8B:00:00:00 that is 4C:54:8B — 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 Cerebras System Inc. located?: Cerebras System Inc. is listed at 1237 E Arques Ave Sunnyvale CA US 94085-4701 in the IEEE OUI registry entry for 4C:54:8B. This is the address the organization registered with the IEEE, which may differ from its current operating address.