Which company owns MAC address prefix 04:B9:7D?

MAC address prefix 04:B9:7D is registered to AiVIS Co., Itd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 04:B9:7D has a network interface built by AiVIS Co., Itd..

What is the OUI 04:B9:7D?

04:B9:7D is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to AiVIS Co., Itd.. It covers every address from 04:B9:7D:00:00:00 to 04:B9:7D:FF:FF:FF, or 16,777,216 addresses in total. It is also written 04-B9-7D.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 04:B9:7D:00:00:00 that is 04:B9:7D — 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 AiVIS Co., Itd. located?

AiVIS Co., Itd. is listed at 112, Dumipo-ro, Jung-gu Incheon Incheon KR 22394 in the IEEE OUI registry entry for 04:B9:7D. This is the address the organization registered with the IEEE, which may differ from its current operating address.

AiVIS Co., Itd.

MAC address prefix 04:B9:7D is registered to AiVIS Co., Itd. in the IEEE OUI registry. Any device whose MAC address begins with 04:B9:7D has a network interface built by AiVIS Co., Itd.. 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 04:B9:7D:00:00:00 to 04:B9:7D:FF:FF:FF.

OUI prefix: 04:B9:7D
Hyphen form: 04-B9-7D
MAC range: 04:B9:7D:00:00:00 – 04:B9:7D:FF:FF:FF
Addresses in block: 16,777,216
Organization: AiVIS Co., Itd.
Address: 112, Dumipo-ro, Jung-gu Incheon Incheon KR 22394
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.

2022-07-11Assigned to "AiVIS Co., Itd."
archived source →
2026-07-17Assigned to "AiVIS Co., Itd."

Nearby in the registry

The prefixes assigned immediately before and after 04:B9:7D:

FAQ

Which company owns MAC address prefix 04:B9:7D?: MAC address prefix 04:B9:7D is registered to AiVIS Co., Itd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 04:B9:7D has a network interface built by AiVIS Co., Itd..
What is the OUI 04:B9:7D?: 04:B9:7D is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to AiVIS Co., Itd.. It covers every address from 04:B9:7D:00:00:00 to 04:B9:7D:FF:FF:FF, or 16,777,216 addresses in total. It is also written 04-B9-7D.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 04:B9:7D:00:00:00 that is 04:B9:7D — 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 AiVIS Co., Itd. located?: AiVIS Co., Itd. is listed at 112, Dumipo-ro, Jung-gu Incheon Incheon KR 22394 in the IEEE OUI registry entry for 04:B9:7D. This is the address the organization registered with the IEEE, which may differ from its current operating address.