Which company owns MAC address prefix A0:40:41?

MAC address prefix A0:40:41 is registered to SAMWONFA Co.,Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with A0:40:41 has a network interface built by SAMWONFA Co.,Ltd..

What is the OUI A0:40:41?

A0:40:41 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to SAMWONFA Co.,Ltd.. It covers every address from A0:40:41:00:00:00 to A0:40:41:FF:FF:FF, or 16,777,216 addresses in total. It is also written A0-40-41.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in A0:40:41:00:00:00 that is A0:40:41 — 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 SAMWONFA Co.,Ltd. located?

SAMWONFA Co.,Ltd. is listed at 470-5, Moonhyun2-Dong Busan KR 608-042 in the IEEE OUI registry entry for A0:40:41. This is the address the organization registered with the IEEE, which may differ from its current operating address.

SAMWONFA Co.,Ltd.

MAC address prefix A0:40:41 is registered to SAMWONFA Co.,Ltd. in the IEEE OUI registry. Any device whose MAC address begins with A0:40:41 has a network interface built by SAMWONFA 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 A0:40:41:00:00:00 to A0:40:41:FF:FF:FF.

OUI prefix: A0:40:41
Hyphen form: A0-40-41
MAC range: A0:40:41:00:00:00 – A0:40:41:FF:FF:FF
Addresses in block: 16,777,216
Organization: SAMWONFA Co.,Ltd.
Address: 470-5, Moonhyun2-Dong Busan KR 608-042
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 "SAMWONFA Co.,Ltd."
archived source →
2026-07-17Assigned to "SAMWONFA Co.,Ltd."

Nearby in the registry

The prefixes assigned immediately before and after A0:40:41:

FAQ

Which company owns MAC address prefix A0:40:41?: MAC address prefix A0:40:41 is registered to SAMWONFA Co.,Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with A0:40:41 has a network interface built by SAMWONFA Co.,Ltd..
What is the OUI A0:40:41?: A0:40:41 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to SAMWONFA Co.,Ltd.. It covers every address from A0:40:41:00:00:00 to A0:40:41:FF:FF:FF, or 16,777,216 addresses in total. It is also written A0-40-41.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in A0:40:41:00:00:00 that is A0:40:41 — 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 SAMWONFA Co.,Ltd. located?: SAMWONFA Co.,Ltd. is listed at 470-5, Moonhyun2-Dong Busan KR 608-042 in the IEEE OUI registry entry for A0:40:41. This is the address the organization registered with the IEEE, which may differ from its current operating address.