Which company owns MAC address prefix AC:F9:7E?

MAC address prefix AC:F9:7E is registered to ELESYS INC. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with AC:F9:7E has a network interface built by ELESYS INC..

What is the OUI AC:F9:7E?

AC:F9:7E is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to ELESYS INC.. It covers every address from AC:F9:7E:00:00:00 to AC:F9:7E:FF:FF:FF, or 16,777,216 addresses in total. It is also written AC-F9-7E.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in AC:F9:7E:00:00:00 that is AC:F9:7E — 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 ELESYS INC. located?

ELESYS INC. is listed at Suit 623, 812-1, Hyomun-dong Ulsan Buk-gu KR 683-360 in the IEEE OUI registry entry for AC:F9:7E. This is the address the organization registered with the IEEE, which may differ from its current operating address.

ELESYS INC.

MAC address prefix AC:F9:7E is registered to ELESYS INC. in the IEEE OUI registry. Any device whose MAC address begins with AC:F9:7E has a network interface built by ELESYS INC.. 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 AC:F9:7E:00:00:00 to AC:F9:7E:FF:FF:FF.

OUI prefix: AC:F9:7E
Hyphen form: AC-F9-7E
MAC range: AC:F9:7E:00:00:00 – AC:F9:7E:FF:FF:FF
Addresses in block: 16,777,216
Organization: ELESYS INC.
Address: Suit 623, 812-1, Hyomun-dong Ulsan Buk-gu KR 683-360
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 "ELESYS INC."
archived source →
2026-07-17Assigned to "ELESYS INC."

Nearby in the registry

The prefixes assigned immediately before and after AC:F9:7E:

FAQ

Which company owns MAC address prefix AC:F9:7E?: MAC address prefix AC:F9:7E is registered to ELESYS INC. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with AC:F9:7E has a network interface built by ELESYS INC..
What is the OUI AC:F9:7E?: AC:F9:7E is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to ELESYS INC.. It covers every address from AC:F9:7E:00:00:00 to AC:F9:7E:FF:FF:FF, or 16,777,216 addresses in total. It is also written AC-F9-7E.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in AC:F9:7E:00:00:00 that is AC:F9:7E — 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 ELESYS INC. located?: ELESYS INC. is listed at Suit 623, 812-1, Hyomun-dong Ulsan Buk-gu KR 683-360 in the IEEE OUI registry entry for AC:F9:7E. This is the address the organization registered with the IEEE, which may differ from its current operating address.