Which company owns MAC address prefix 08:E3:42?

MAC address prefix 08:E3:42 is registered to Cear, Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 08:E3:42 has a network interface built by Cear, Inc..

What is the OUI 08:E3:42?

08:E3:42 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Cear, Inc.. It covers every address from 08:E3:42:00:00:00 to 08:E3:42:FF:FF:FF, or 16,777,216 addresses in total. It is also written 08-E3-42.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 08:E3:42:00:00:00 that is 08:E3:42 — 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 Cear, Inc. located?

Cear, Inc. is listed at 6F, Takei Bldg. 2-19-6, Taito, Taito-ku Tokyo JP 110-0016 in the IEEE OUI registry entry for 08:E3:42. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Cear, Inc.

MAC address prefix 08:E3:42 is registered to Cear, Inc. in the IEEE OUI registry. Any device whose MAC address begins with 08:E3:42 has a network interface built by Cear, 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 08:E3:42:00:00:00 to 08:E3:42:FF:FF:FF.

OUI prefix: 08:E3:42
Hyphen form: 08-E3-42
MAC range: 08:E3:42:00:00:00 – 08:E3:42:FF:FF:FF
Addresses in block: 16,777,216
Organization: Cear, Inc.
Address: 6F, Takei Bldg. 2-19-6, Taito, Taito-ku Tokyo JP 110-0016
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.

2024-02-15Assigned to "Cear, Inc."
archived source →
2026-07-17Assigned to "Cear, Inc."

Nearby in the registry

The prefixes assigned immediately before and after 08:E3:42:

FAQ

Which company owns MAC address prefix 08:E3:42?: MAC address prefix 08:E3:42 is registered to Cear, Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 08:E3:42 has a network interface built by Cear, Inc..
What is the OUI 08:E3:42?: 08:E3:42 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Cear, Inc.. It covers every address from 08:E3:42:00:00:00 to 08:E3:42:FF:FF:FF, or 16,777,216 addresses in total. It is also written 08-E3-42.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 08:E3:42:00:00:00 that is 08:E3:42 — 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 Cear, Inc. located?: Cear, Inc. is listed at 6F, Takei Bldg. 2-19-6, Taito, Taito-ku Tokyo JP 110-0016 in the IEEE OUI registry entry for 08:E3:42. This is the address the organization registered with the IEEE, which may differ from its current operating address.