Which company owns MAC address prefix 64:A4:44?

MAC address prefix 64:A4:44 is registered to Loongson Technology Corporation Limited in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 64:A4:44 has a network interface built by Loongson Technology Corporation Limited.

What is the OUI 64:A4:44?

64:A4:44 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Loongson Technology Corporation Limited. It covers every address from 64:A4:44:00:00:00 to 64:A4:44:FF:FF:FF, or 16,777,216 addresses in total. It is also written 64-A4-44.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 64:A4:44:00:00:00 that is 64:A4:44 — 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 Loongson Technology Corporation Limited located?

Loongson Technology Corporation Limited is listed at Loongson Industrial Park, building 2 , Zhongguancun Environmental protection park, Haidian District Beijing CN 100095 in the IEEE OUI registry entry for 64:A4:44. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Loongson Technology Corporation Limited

MAC address prefix 64:A4:44 is registered to Loongson Technology Corporation Limited in the IEEE OUI registry. Any device whose MAC address begins with 64:A4:44 has a network interface built by Loongson Technology Corporation Limited. 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 64:A4:44:00:00:00 to 64:A4:44:FF:FF:FF.

OUI prefix: 64:A4:44
Hyphen form: 64-A4-44
MAC range: 64:A4:44:00:00:00 – 64:A4:44:FF:FF:FF
Addresses in block: 16,777,216
Organization: Loongson Technology Corporation Limited
Address: Loongson Industrial Park, building 2 , Zhongguancun Environmental protection park, Haidian District Beijing CN 100095
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.

2024-02-15Assigned to "Loongson Technology Corporation Limited"
archived source →
2026-07-17Assigned to "Loongson Technology Corporation Limited"

Nearby in the registry

The prefixes assigned immediately before and after 64:A4:44:

FAQ

Which company owns MAC address prefix 64:A4:44?: MAC address prefix 64:A4:44 is registered to Loongson Technology Corporation Limited in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 64:A4:44 has a network interface built by Loongson Technology Corporation Limited.
What is the OUI 64:A4:44?: 64:A4:44 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Loongson Technology Corporation Limited. It covers every address from 64:A4:44:00:00:00 to 64:A4:44:FF:FF:FF, or 16,777,216 addresses in total. It is also written 64-A4-44.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 64:A4:44:00:00:00 that is 64:A4:44 — 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 Loongson Technology Corporation Limited located?: Loongson Technology Corporation Limited is listed at Loongson Industrial Park, building 2 , Zhongguancun Environmental protection park, Haidian District Beijing CN 100095 in the IEEE OUI registry entry for 64:A4:44. This is the address the organization registered with the IEEE, which may differ from its current operating address.