Which company owns MAC address prefix 78:A1:83?

MAC address prefix 78:A1:83 is registered to Advidia in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 78:A1:83 has a network interface built by Advidia.

What is the OUI 78:A1:83?

78:A1:83 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Advidia. It covers every address from 78:A1:83:00:00:00 to 78:A1:83:FF:FF:FF, or 16,777,216 addresses in total. It is also written 78-A1-83.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 78:A1:83:00:00:00 that is 78:A1:83 — 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 Advidia located?

Advidia is listed at 3 Riverway Houston TX US 77056 in the IEEE OUI registry entry for 78:A1:83. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Advidia

MAC address prefix 78:A1:83 is registered to Advidia in the IEEE OUI registry. Any device whose MAC address begins with 78:A1:83 has a network interface built by Advidia. 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 78:A1:83:00:00:00 to 78:A1:83:FF:FF:FF.

OUI prefix: 78:A1:83
Hyphen form: 78-A1-83
MAC range: 78:A1:83:00:00:00 – 78:A1:83:FF:FF:FF
Addresses in block: 16,777,216
Organization: Advidia
Address: 3 Riverway Houston TX US 77056
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 "Advidia"
archived source →
2026-07-17Assigned to "Advidia"

Nearby in the registry

The prefixes assigned immediately before and after 78:A1:83:

FAQ

Which company owns MAC address prefix 78:A1:83?: MAC address prefix 78:A1:83 is registered to Advidia in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 78:A1:83 has a network interface built by Advidia.
What is the OUI 78:A1:83?: 78:A1:83 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Advidia. It covers every address from 78:A1:83:00:00:00 to 78:A1:83:FF:FF:FF, or 16,777,216 addresses in total. It is also written 78-A1-83.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 78:A1:83:00:00:00 that is 78:A1:83 — 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 Advidia located?: Advidia is listed at 3 Riverway Houston TX US 77056 in the IEEE OUI registry entry for 78:A1:83. This is the address the organization registered with the IEEE, which may differ from its current operating address.