Which company owns MAC address prefix AA:00:04?

MAC address prefix AA:00:04 is registered to DIGITAL EQUIPMENT CORPORATION in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with AA:00:04 has a network interface built by DIGITAL EQUIPMENT CORPORATION.

What is the OUI AA:00:04?

AA:00:04 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to DIGITAL EQUIPMENT CORPORATION. It covers every address from AA:00:04:00:00:00 to AA:00:04:FF:FF:FF, or 16,777,216 addresses in total. It is also written AA-00-04.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in AA:00:04:00:00:00 that is AA:00:04 — 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 DIGITAL EQUIPMENT CORPORATION located?

DIGITAL EQUIPMENT CORPORATION is listed at LKG 1-2/A19 LITTLETON MA US 01460-1289 in the IEEE OUI registry entry for AA:00:04. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does DIGITAL EQUIPMENT CORPORATION own?

DIGITAL EQUIPMENT CORPORATION holds 9 OUI prefixes in the IEEE registry, of which AA:00:04 is one. A device made by DIGITAL EQUIPMENT CORPORATION could carry a MAC address from any of them.

DIGITAL EQUIPMENT CORPORATION

MAC address prefix AA:00:04 is registered to DIGITAL EQUIPMENT CORPORATION in the IEEE OUI registry. Any device whose MAC address begins with AA:00:04 has a network interface built by DIGITAL EQUIPMENT CORPORATION. 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 AA:00:04:00:00:00 to AA:00:04:FF:FF:FF.

OUI prefix: AA:00:04
Hyphen form: AA-00-04
MAC range: AA:00:04:00:00:00 – AA:00:04:FF:FF:FF
Addresses in block: 16,777,216
Organization: DIGITAL EQUIPMENT CORPORATION
Address: LKG 1-2/A19 LITTLETON MA US 01460-1289
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.

Other prefixes from DIGITAL EQUIPMENT CORPORATION

DIGITAL EQUIPMENT CORPORATION holds 9 OUI prefixes in total. A device with this exact prefix could just as well carry any of these:

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 "DIGITAL EQUIPMENT CORPORATION"
archived source →
2026-07-17Assigned to "DIGITAL EQUIPMENT CORPORATION"

Nearby in the registry

The prefixes assigned immediately before and after AA:00:04:

FAQ

Which company owns MAC address prefix AA:00:04?: MAC address prefix AA:00:04 is registered to DIGITAL EQUIPMENT CORPORATION in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with AA:00:04 has a network interface built by DIGITAL EQUIPMENT CORPORATION.
What is the OUI AA:00:04?: AA:00:04 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to DIGITAL EQUIPMENT CORPORATION. It covers every address from AA:00:04:00:00:00 to AA:00:04:FF:FF:FF, or 16,777,216 addresses in total. It is also written AA-00-04.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in AA:00:04:00:00:00 that is AA:00:04 — 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 DIGITAL EQUIPMENT CORPORATION located?: DIGITAL EQUIPMENT CORPORATION is listed at LKG 1-2/A19 LITTLETON MA US 01460-1289 in the IEEE OUI registry entry for AA:00:04. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does DIGITAL EQUIPMENT CORPORATION own?: DIGITAL EQUIPMENT CORPORATION holds 9 OUI prefixes in the IEEE registry, of which AA:00:04 is one. A device made by DIGITAL EQUIPMENT CORPORATION could carry a MAC address from any of them.