Which company owns MAC address prefix AC:C7:3F?

MAC address prefix AC:C7:3F is registered to VITSMO CO., LTD. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with AC:C7:3F has a network interface built by VITSMO CO., LTD..

What is the OUI AC:C7:3F?

AC:C7:3F is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to VITSMO CO., LTD.. It covers every address from AC:C7:3F:00:00:00 to AC:C7:3F:FF:FF:FF, or 16,777,216 addresses in total. It is also written AC-C7-3F.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in AC:C7:3F:00:00:00 that is AC:C7:3F — 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 VITSMO CO., LTD. located?

VITSMO CO., LTD. is listed at RM1418-1419, HansinIntervalley 24 Bldg. SEOUL KR 135-918 in the IEEE OUI registry entry for AC:C7:3F. This is the address the organization registered with the IEEE, which may differ from its current operating address.

VITSMO CO., LTD.

MAC address prefix AC:C7:3F is registered to VITSMO CO., LTD. in the IEEE OUI registry. Any device whose MAC address begins with AC:C7:3F has a network interface built by VITSMO 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 AC:C7:3F:00:00:00 to AC:C7:3F:FF:FF:FF.

OUI prefix: AC:C7:3F
Hyphen form: AC-C7-3F
MAC range: AC:C7:3F:00:00:00 – AC:C7:3F:FF:FF:FF
Addresses in block: 16,777,216
Organization: VITSMO CO., LTD.
Address: RM1418-1419, HansinIntervalley 24 Bldg. SEOUL KR 135-918
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 "VITSMO CO., LTD."
archived source →
2026-07-17Assigned to "VITSMO CO., LTD."

Nearby in the registry

The prefixes assigned immediately before and after AC:C7:3F:

FAQ

Which company owns MAC address prefix AC:C7:3F?: MAC address prefix AC:C7:3F is registered to VITSMO CO., LTD. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with AC:C7:3F has a network interface built by VITSMO CO., LTD..
What is the OUI AC:C7:3F?: AC:C7:3F is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to VITSMO CO., LTD.. It covers every address from AC:C7:3F:00:00:00 to AC:C7:3F:FF:FF:FF, or 16,777,216 addresses in total. It is also written AC-C7-3F.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in AC:C7:3F:00:00:00 that is AC:C7:3F — 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 VITSMO CO., LTD. located?: VITSMO CO., LTD. is listed at RM1418-1419, HansinIntervalley 24 Bldg. SEOUL KR 135-918 in the IEEE OUI registry entry for AC:C7:3F. This is the address the organization registered with the IEEE, which may differ from its current operating address.