Which company owns MAC address prefix 00:26:DC?

MAC address prefix 00:26:DC is registered to Optical Systems Design in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 00:26:DC has a network interface built by Optical Systems Design.

What is the OUI 00:26:DC?

00:26:DC is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Optical Systems Design. It covers every address from 00:26:DC:00:00:00 to 00:26:DC:FF:FF:FF, or 16,777,216 addresses in total. It is also written 00-26-DC.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 00:26:DC:00:00:00 that is 00:26:DC — 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 Optical Systems Design located?

Optical Systems Design is listed at 7/1 Vuko Place Warriewood NSW AU 2102 in the IEEE OUI registry entry for 00:26:DC. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Optical Systems Design

MAC address prefix 00:26:DC is registered to Optical Systems Design in the IEEE OUI registry. Any device whose MAC address begins with 00:26:DC has a network interface built by Optical Systems Design. 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 00:26:DC:00:00:00 to 00:26:DC:FF:FF:FF.

OUI prefix: 00:26:DC
Hyphen form: 00-26-DC
MAC range: 00:26:DC:00:00:00 – 00:26:DC:FF:FF:FF
Addresses in block: 16,777,216
Organization: Optical Systems Design
Address: 7/1 Vuko Place Warriewood NSW AU 2102
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.

2016-07-29Assigned to "Optical Systems Design"
archived source →
2026-07-17Assigned to "Optical Systems Design"

Nearby in the registry

The prefixes assigned immediately before and after 00:26:DC:

FAQ

Which company owns MAC address prefix 00:26:DC?: MAC address prefix 00:26:DC is registered to Optical Systems Design in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 00:26:DC has a network interface built by Optical Systems Design.
What is the OUI 00:26:DC?: 00:26:DC is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Optical Systems Design. It covers every address from 00:26:DC:00:00:00 to 00:26:DC:FF:FF:FF, or 16,777,216 addresses in total. It is also written 00-26-DC.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 00:26:DC:00:00:00 that is 00:26:DC — 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 Optical Systems Design located?: Optical Systems Design is listed at 7/1 Vuko Place Warriewood NSW AU 2102 in the IEEE OUI registry entry for 00:26:DC. This is the address the organization registered with the IEEE, which may differ from its current operating address.