Which company owns MAC address prefix 44:0F:B4?

MAC address prefix 44:0F:B4 is registered to GSD VIET NAM TECHNOLOGY COMPANY LIMITED in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 44:0F:B4 has a network interface built by GSD VIET NAM TECHNOLOGY COMPANY LIMITED.

What is the OUI 44:0F:B4?

44:0F:B4 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to GSD VIET NAM TECHNOLOGY COMPANY LIMITED. It covers every address from 44:0F:B4:00:00:00 to 44:0F:B4:FF:FF:FF, or 16,777,216 addresses in total. It is also written 44-0F-B4.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 44:0F:B4:00:00:00 that is 44:0F:B4 — 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 GSD VIET NAM TECHNOLOGY COMPANY LIMITED located?

GSD VIET NAM TECHNOLOGY COMPANY LIMITED is listed at PART OF FACTORY 2, LOT C2.10, D1 STREET, DONG AN 2 INDUSTRIAL PARK, BINHDUONG WARD HO CHI MINH CITY HO CHI MINH VN 820000 in the IEEE OUI registry entry for 44:0F:B4. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does GSD VIET NAM TECHNOLOGY COMPANY LIMITED own?

GSD VIET NAM TECHNOLOGY COMPANY LIMITED holds 15 OUI prefixes in the IEEE registry, of which 44:0F:B4 is one. A device made by GSD VIET NAM TECHNOLOGY COMPANY LIMITED could carry a MAC address from any of them.

GSD VIET NAM TECHNOLOGY COMPANY LIMITED

MAC address prefix 44:0F:B4 is registered to GSD VIET NAM TECHNOLOGY COMPANY LIMITED in the IEEE OUI registry. Any device whose MAC address begins with 44:0F:B4 has a network interface built by GSD VIET NAM TECHNOLOGY COMPANY 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 44:0F:B4:00:00:00 to 44:0F:B4:FF:FF:FF.

OUI prefix: 44:0F:B4
Hyphen form: 44-0F-B4
MAC range: 44:0F:B4:00:00:00 – 44:0F:B4:FF:FF:FF
Addresses in block: 16,777,216
Organization: GSD VIET NAM TECHNOLOGY COMPANY LIMITED
Address: PART OF FACTORY 2, LOT C2.10, D1 STREET, DONG AN 2 INDUSTRIAL PARK, BINHDUONG WARD HO CHI MINH CITY HO CHI MINH VN 820000
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 GSD VIET NAM TECHNOLOGY COMPANY LIMITED

GSD VIET NAM TECHNOLOGY COMPANY LIMITED holds 15 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.

2026-01-08Assigned to "GSD VIET NAM TECHNOLOGY COMPANY LIMITED"
archived source →
2026-07-17Assigned to "GSD VIET NAM TECHNOLOGY COMPANY LIMITED"

Nearby in the registry

The prefixes assigned immediately before and after 44:0F:B4:

FAQ

Which company owns MAC address prefix 44:0F:B4?: MAC address prefix 44:0F:B4 is registered to GSD VIET NAM TECHNOLOGY COMPANY LIMITED in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 44:0F:B4 has a network interface built by GSD VIET NAM TECHNOLOGY COMPANY LIMITED.
What is the OUI 44:0F:B4?: 44:0F:B4 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to GSD VIET NAM TECHNOLOGY COMPANY LIMITED. It covers every address from 44:0F:B4:00:00:00 to 44:0F:B4:FF:FF:FF, or 16,777,216 addresses in total. It is also written 44-0F-B4.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 44:0F:B4:00:00:00 that is 44:0F:B4 — 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 GSD VIET NAM TECHNOLOGY COMPANY LIMITED located?: GSD VIET NAM TECHNOLOGY COMPANY LIMITED is listed at PART OF FACTORY 2, LOT C2.10, D1 STREET, DONG AN 2 INDUSTRIAL PARK, BINHDUONG WARD HO CHI MINH CITY HO CHI MINH VN 820000 in the IEEE OUI registry entry for 44:0F:B4. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does GSD VIET NAM TECHNOLOGY COMPANY LIMITED own?: GSD VIET NAM TECHNOLOGY COMPANY LIMITED holds 15 OUI prefixes in the IEEE registry, of which 44:0F:B4 is one. A device made by GSD VIET NAM TECHNOLOGY COMPANY LIMITED could carry a MAC address from any of them.