Which company owns MAC address prefix 18:4B:DF?

MAC address prefix 18:4B:DF is registered to Caavo Inc in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 18:4B:DF has a network interface built by Caavo Inc.

What is the OUI 18:4B:DF?

18:4B:DF is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Caavo Inc. It covers every address from 18:4B:DF:00:00:00 to 18:4B:DF:FF:FF:FF, or 16,777,216 addresses in total. It is also written 18-4B-DF.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 18:4B:DF:00:00:00 that is 18:4B:DF — 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 Caavo Inc located?

Caavo Inc is listed at 1525 McCarthy Blvd., #1182 Milpitas US 95035 in the IEEE OUI registry entry for 18:4B:DF. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Caavo Inc

MAC address prefix 18:4B:DF is registered to Caavo Inc in the IEEE OUI registry. Any device whose MAC address begins with 18:4B:DF has a network interface built by Caavo 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 18:4B:DF:00:00:00 to 18:4B:DF:FF:FF:FF.

OUI prefix: 18:4B:DF
Hyphen form: 18-4B-DF
MAC range: 18:4B:DF:00:00:00 – 18:4B:DF:FF:FF:FF
Addresses in block: 16,777,216
Organization: Caavo Inc
Address: 1525 McCarthy Blvd., #1182 Milpitas US 95035
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 "Caavo Inc"
archived source →
2026-07-17Assigned to "Caavo Inc"

Nearby in the registry

The prefixes assigned immediately before and after 18:4B:DF:

FAQ

Which company owns MAC address prefix 18:4B:DF?: MAC address prefix 18:4B:DF is registered to Caavo Inc in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 18:4B:DF has a network interface built by Caavo Inc.
What is the OUI 18:4B:DF?: 18:4B:DF is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Caavo Inc. It covers every address from 18:4B:DF:00:00:00 to 18:4B:DF:FF:FF:FF, or 16,777,216 addresses in total. It is also written 18-4B-DF.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 18:4B:DF:00:00:00 that is 18:4B:DF — 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 Caavo Inc located?: Caavo Inc is listed at 1525 McCarthy Blvd., #1182 Milpitas US 95035 in the IEEE OUI registry entry for 18:4B:DF. This is the address the organization registered with the IEEE, which may differ from its current operating address.