Which company owns MAC address prefix DC:E3:05?

MAC address prefix DC:E3:05 is registered to AO in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with DC:E3:05 has a network interface built by AO.

What is the OUI DC:E3:05?

DC:E3:05 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to AO. It covers every address from DC:E3:05:00:00:00 to DC:E3:05:FF:FF:FF, or 16,777,216 addresses in total. It is also written DC-E3-05.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in DC:E3:05:00:00:00 that is DC:E3:05 — 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.

AO is listed at Prospekt Mira Moscow RU 129223 in the IEEE OUI registry entry for DC:E3:05. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does AO own?

AO holds 4 OUI prefixes in the IEEE registry, of which DC:E3:05 is one. A device made by AO could carry a MAC address from any of them.

AO

MAC address prefix DC:E3:05 is registered to AO in the IEEE OUI registry. Any device whose MAC address begins with DC:E3:05 has a network interface built by AO. 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 DC:E3:05:00:00:00 to DC:E3:05:FF:FF:FF.

OUI prefix: DC:E3:05
Hyphen form: DC-E3-05
MAC range: DC:E3:05:00:00:00 – DC:E3:05:FF:FF:FF
Addresses in block: 16,777,216
Organization: AO
Address: Prospekt Mira Moscow RU 129223
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 AO

AO holds 4 OUI prefixes in total. A device with this exact prefix could just as well carry any of these:

Assignment history (3)

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 "ZAO "NPK Rotek""
archived source →
2023-07-11Renamed from "ZAO "NPK Rotek"" to "AO"
archived source →
2026-07-17Assigned to "AO"

Nearby in the registry

The prefixes assigned immediately before and after DC:E3:05:

FAQ

Which company owns MAC address prefix DC:E3:05?: MAC address prefix DC:E3:05 is registered to AO in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with DC:E3:05 has a network interface built by AO.
What is the OUI DC:E3:05?: DC:E3:05 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to AO. It covers every address from DC:E3:05:00:00:00 to DC:E3:05:FF:FF:FF, or 16,777,216 addresses in total. It is also written DC-E3-05.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in DC:E3:05:00:00:00 that is DC:E3:05 — 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 AO located?: AO is listed at Prospekt Mira Moscow RU 129223 in the IEEE OUI registry entry for DC:E3:05. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does AO own?: AO holds 4 OUI prefixes in the IEEE registry, of which DC:E3:05 is one. A device made by AO could carry a MAC address from any of them.