Which company owns MAC address prefix CC:3B:58?

MAC address prefix CC:3B:58 is registered to Curiouser Products Inc in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with CC:3B:58 has a network interface built by Curiouser Products Inc.

What is the OUI CC:3B:58?

CC:3B:58 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Curiouser Products Inc. It covers every address from CC:3B:58:00:00:00 to CC:3B:58:FF:FF:FF, or 16,777,216 addresses in total. It is also written CC-3B-58.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in CC:3B:58:00:00:00 that is CC:3B:58 — 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 Curiouser Products Inc located?

Curiouser Products Inc is listed at 712 Broadway #4 New York NY US 10003 in the IEEE OUI registry entry for CC:3B:58. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Curiouser Products Inc

MAC address prefix CC:3B:58 is registered to Curiouser Products Inc in the IEEE OUI registry. Any device whose MAC address begins with CC:3B:58 has a network interface built by Curiouser Products 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 CC:3B:58:00:00:00 to CC:3B:58:FF:FF:FF.

OUI prefix: CC:3B:58
Hyphen form: CC-3B-58
MAC range: CC:3B:58:00:00:00 – CC:3B:58:FF:FF:FF
Addresses in block: 16,777,216
Organization: Curiouser Products Inc
Address: 712 Broadway #4 New York NY US 10003
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 "Curiouser Products Inc"
archived source →
2026-07-17Assigned to "Curiouser Products Inc"

Nearby in the registry

The prefixes assigned immediately before and after CC:3B:58:

FAQ

Which company owns MAC address prefix CC:3B:58?: MAC address prefix CC:3B:58 is registered to Curiouser Products Inc in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with CC:3B:58 has a network interface built by Curiouser Products Inc.
What is the OUI CC:3B:58?: CC:3B:58 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Curiouser Products Inc. It covers every address from CC:3B:58:00:00:00 to CC:3B:58:FF:FF:FF, or 16,777,216 addresses in total. It is also written CC-3B-58.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in CC:3B:58:00:00:00 that is CC:3B:58 — 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 Curiouser Products Inc located?: Curiouser Products Inc is listed at 712 Broadway #4 New York NY US 10003 in the IEEE OUI registry entry for CC:3B:58. This is the address the organization registered with the IEEE, which may differ from its current operating address.