Which company owns MAC address prefix 70:55:F8?

MAC address prefix 70:55:F8 is registered to Cerebras Systems Inc in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 70:55:F8 has a network interface built by Cerebras Systems Inc.

What is the OUI 70:55:F8?

70:55:F8 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Cerebras Systems Inc. It covers every address from 70:55:F8:00:00:00 to 70:55:F8:FF:FF:FF, or 16,777,216 addresses in total. It is also written 70-55-F8.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 70:55:F8:00:00:00 that is 70:55:F8 — 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 Systems Inc located?

Cerebras Systems Inc is listed at 175 S San Antonio Rd #100 Los Altos CA US 94022 in the IEEE OUI registry entry for 70:55:F8. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Cerebras Systems Inc

MAC address prefix 70:55:F8 is registered to Cerebras Systems Inc in the IEEE OUI registry. Any device whose MAC address begins with 70:55:F8 has a network interface built by Cerebras Systems 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 70:55:F8:00:00:00 to 70:55:F8:FF:FF:FF.

OUI prefix: 70:55:F8
Hyphen form: 70-55-F8
MAC range: 70:55:F8:00:00:00 – 70:55:F8:FF:FF:FF
Addresses in block: 16,777,216
Organization: Cerebras Systems Inc
Address: 175 S San Antonio Rd #100 Los Altos CA US 94022
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.

2018-12-21Assigned to "Cerebras Systems Inc"
archived source →
2026-07-17Assigned to "Cerebras Systems Inc"

Nearby in the registry

The prefixes assigned immediately before and after 70:55:F8:

FAQ

Which company owns MAC address prefix 70:55:F8?: MAC address prefix 70:55:F8 is registered to Cerebras Systems Inc in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 70:55:F8 has a network interface built by Cerebras Systems Inc.
What is the OUI 70:55:F8?: 70:55:F8 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Cerebras Systems Inc. It covers every address from 70:55:F8:00:00:00 to 70:55:F8:FF:FF:FF, or 16,777,216 addresses in total. It is also written 70-55-F8.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 70:55:F8:00:00:00 that is 70:55:F8 — 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 Systems Inc located?: Cerebras Systems Inc is listed at 175 S San Antonio Rd #100 Los Altos CA US 94022 in the IEEE OUI registry entry for 70:55:F8. This is the address the organization registered with the IEEE, which may differ from its current operating address.