Which company owns MAC address prefix 78:A6:BD?

MAC address prefix 78:A6:BD is registered to DAEYEON Control&Instrument Co,.Ltd in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 78:A6:BD has a network interface built by DAEYEON Control&Instrument Co,.Ltd.

What is the OUI 78:A6:BD?

78:A6:BD is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to DAEYEON Control&Instrument Co,.Ltd. It covers every address from 78:A6:BD:00:00:00 to 78:A6:BD:FF:FF:FF, or 16,777,216 addresses in total. It is also written 78-A6-BD.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 78:A6:BD:00:00:00 that is 78:A6:BD — 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 DAEYEON Control&Instrument Co,.Ltd located?

DAEYEON Control&Instrument Co,.Ltd is listed at ACETECHNOTOWER 2-108, 197-7, Guro3-Dong, Guro-Gu, Seoul KR 152-766 in the IEEE OUI registry entry for 78:A6:BD. This is the address the organization registered with the IEEE, which may differ from its current operating address.

DAEYEON Control&Instrument Co,.Ltd

MAC address prefix 78:A6:BD is registered to DAEYEON Control&Instrument Co,.Ltd in the IEEE OUI registry. Any device whose MAC address begins with 78:A6:BD has a network interface built by DAEYEON Control&Instrument Co,.Ltd. 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 78:A6:BD:00:00:00 to 78:A6:BD:FF:FF:FF.

OUI prefix: 78:A6:BD
Hyphen form: 78-A6-BD
MAC range: 78:A6:BD:00:00:00 – 78:A6:BD:FF:FF:FF
Addresses in block: 16,777,216
Organization: DAEYEON Control&Instrument Co,.Ltd
Address: ACETECHNOTOWER 2-108, 197-7, Guro3-Dong, Guro-Gu, Seoul KR 152-766
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 "DAEYEON Control&Instrument Co,.Ltd"
archived source →
2026-07-17Assigned to "DAEYEON Control&Instrument Co,.Ltd"

Nearby in the registry

The prefixes assigned immediately before and after 78:A6:BD:

FAQ

Which company owns MAC address prefix 78:A6:BD?: MAC address prefix 78:A6:BD is registered to DAEYEON Control&Instrument Co,.Ltd in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 78:A6:BD has a network interface built by DAEYEON Control&Instrument Co,.Ltd.
What is the OUI 78:A6:BD?: 78:A6:BD is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to DAEYEON Control&Instrument Co,.Ltd. It covers every address from 78:A6:BD:00:00:00 to 78:A6:BD:FF:FF:FF, or 16,777,216 addresses in total. It is also written 78-A6-BD.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 78:A6:BD:00:00:00 that is 78:A6:BD — 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 DAEYEON Control&Instrument Co,.Ltd located?: DAEYEON Control&Instrument Co,.Ltd is listed at ACETECHNOTOWER 2-108, 197-7, Guro3-Dong, Guro-Gu, Seoul KR 152-766 in the IEEE OUI registry entry for 78:A6:BD. This is the address the organization registered with the IEEE, which may differ from its current operating address.