Which company owns MAC address prefix 90:C9:52?

MAC address prefix 90:C9:52 is registered to Durin, Inc in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 90:C9:52 has a network interface built by Durin, Inc.

What is the OUI 90:C9:52?

90:C9:52 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Durin, Inc. It covers every address from 90:C9:52:00:00:00 to 90:C9:52:FF:FF:FF, or 16,777,216 addresses in total. It is also written 90-C9-52.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 90:C9:52:00:00:00 that is 90:C9:52 — 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 Durin, Inc located?

Durin, Inc is listed at 440 N Wolfe Rd Sunnyvale CA US 94085 in the IEEE OUI registry entry for 90:C9:52. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Durin, Inc

MAC address prefix 90:C9:52 is registered to Durin, Inc in the IEEE OUI registry. Any device whose MAC address begins with 90:C9:52 has a network interface built by Durin, 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 90:C9:52:00:00:00 to 90:C9:52:FF:FF:FF.

OUI prefix: 90:C9:52
Hyphen form: 90-C9-52
MAC range: 90:C9:52:00:00:00 – 90:C9:52:FF:FF:FF
Addresses in block: 16,777,216
Organization: Durin, Inc
Address: 440 N Wolfe Rd Sunnyvale CA US 94085
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.

2026-01-08Assigned to "Durin, Inc"
archived source →
2026-07-17Assigned to "Durin, Inc"

Nearby in the registry

The prefixes assigned immediately before and after 90:C9:52:

FAQ

Which company owns MAC address prefix 90:C9:52?: MAC address prefix 90:C9:52 is registered to Durin, Inc in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 90:C9:52 has a network interface built by Durin, Inc.
What is the OUI 90:C9:52?: 90:C9:52 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Durin, Inc. It covers every address from 90:C9:52:00:00:00 to 90:C9:52:FF:FF:FF, or 16,777,216 addresses in total. It is also written 90-C9-52.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 90:C9:52:00:00:00 that is 90:C9:52 — 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 Durin, Inc located?: Durin, Inc is listed at 440 N Wolfe Rd Sunnyvale CA US 94085 in the IEEE OUI registry entry for 90:C9:52. This is the address the organization registered with the IEEE, which may differ from its current operating address.