Which company owns MAC address prefix 40:FF:40?

MAC address prefix 40:FF:40 is registered to GloquadTech in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 40:FF:40 has a network interface built by GloquadTech.

What is the OUI 40:FF:40?

40:FF:40 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to GloquadTech. It covers every address from 40:FF:40:00:00:00 to 40:FF:40:FF:FF:FF, or 16,777,216 addresses in total. It is also written 40-FF-40.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 40:FF:40:00:00:00 that is 40:FF:40 — 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 GloquadTech located?

GloquadTech is listed at 801, Tower-A, 58-1, Giheung-ro, Giheung-gu, Yongin-si, Gyeonggi-do, 16976, Republic of Korea Yongin-si Gyeonggi-do KR 16976 in the IEEE OUI registry entry for 40:FF:40. This is the address the organization registered with the IEEE, which may differ from its current operating address.

GloquadTech

MAC address prefix 40:FF:40 is registered to GloquadTech in the IEEE OUI registry. Any device whose MAC address begins with 40:FF:40 has a network interface built by GloquadTech. 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 40:FF:40:00:00:00 to 40:FF:40:FF:FF:FF.

OUI prefix: 40:FF:40
Hyphen form: 40-FF-40
MAC range: 40:FF:40:00:00:00 – 40:FF:40:FF:FF:FF
Addresses in block: 16,777,216
Organization: GloquadTech
Address: 801, Tower-A, 58-1, Giheung-ro, Giheung-gu, Yongin-si, Gyeonggi-do, 16976, Republic of Korea Yongin-si Gyeonggi-do KR 16976
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.

2023-07-11Assigned to "GloquadTech"
archived source →
2026-07-17Assigned to "GloquadTech"

Nearby in the registry

The prefixes assigned immediately before and after 40:FF:40:

FAQ

Which company owns MAC address prefix 40:FF:40?: MAC address prefix 40:FF:40 is registered to GloquadTech in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 40:FF:40 has a network interface built by GloquadTech.
What is the OUI 40:FF:40?: 40:FF:40 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to GloquadTech. It covers every address from 40:FF:40:00:00:00 to 40:FF:40:FF:FF:FF, or 16,777,216 addresses in total. It is also written 40-FF-40.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 40:FF:40:00:00:00 that is 40:FF:40 — 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 GloquadTech located?: GloquadTech is listed at 801, Tower-A, 58-1, Giheung-ro, Giheung-gu, Yongin-si, Gyeonggi-do, 16976, Republic of Korea Yongin-si Gyeonggi-do KR 16976 in the IEEE OUI registry entry for 40:FF:40. This is the address the organization registered with the IEEE, which may differ from its current operating address.