Which company owns MAC address prefix EC:3F:05?

MAC address prefix EC:3F:05 is registered to Institute 706, The Second Academy China Aerospace Science & Industry Corp in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with EC:3F:05 has a network interface built by Institute 706, The Second Academy China Aerospace Science & Industry Corp.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in EC:3F:05:00:00:00 that is EC:3F: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.

Institute 706, The Second Academy China Aerospace Science & Industry Corp

MAC address prefix EC:3F:05 is registered to Institute 706, The Second Academy China Aerospace Science & Industry Corp in the IEEE OUI registry. Any device whose MAC address begins with EC:3F:05 has a network interface built by Institute 706, The Second Academy China Aerospace Science & Industry Corp. 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 EC:3F:05:00:00:00 to EC:3F:05:FF:FF:FF.

OUI prefix: EC:3F:05
Hyphen form: EC-3F-05
MAC range: EC:3F:05:00:00:00 – EC:3F:05:FF:FF:FF
Addresses in block: 16,777,216
Organization: Institute 706, The Second Academy China Aerospace Science & Industry Corp
Address: YongDing Road ,HaiDian District.BeiJing ,No.51 BeiJing CN 100854
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 "Institute 706, The Second Academy China Aerospace Science & Industry Corp"
archived source →
2026-07-17Assigned to "Institute 706, The Second Academy China Aerospace Science & Industry Corp"

Nearby in the registry

The prefixes assigned immediately before and after EC:3F:05:

FAQ

Which company owns MAC address prefix EC:3F:05?: MAC address prefix EC:3F:05 is registered to Institute 706, The Second Academy China Aerospace Science & Industry Corp in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with EC:3F:05 has a network interface built by Institute 706, The Second Academy China Aerospace Science & Industry Corp.
What is the OUI EC:3F:05?: EC:3F:05 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Institute 706, The Second Academy China Aerospace Science & Industry Corp. It covers every address from EC:3F:05:00:00:00 to EC:3F:05:FF:FF:FF, or 16,777,216 addresses in total. It is also written EC-3F-05.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in EC:3F:05:00:00:00 that is EC:3F: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 Institute 706, The Second Academy China Aerospace Science & Industry Corp located?: Institute 706, The Second Academy China Aerospace Science & Industry Corp is listed at YongDing Road ,HaiDian District.BeiJing ,No.51 BeiJing CN 100854 in the IEEE OUI registry entry for EC:3F:05. This is the address the organization registered with the IEEE, which may differ from its current operating address.