Which company owns MAC address prefix 10:5F:81?

MAC address prefix 10:5F:81 is registered to INTENTSECURE Inc., in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 10:5F:81 has a network interface built by INTENTSECURE Inc.,.

What is the OUI 10:5F:81?

10:5F:81 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to INTENTSECURE Inc.,. It covers every address from 10:5F:81:00:00:00 to 10:5F:81:FF:FF:FF, or 16,777,216 addresses in total. It is also written 10-5F-81.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 10:5F:81:00:00:00 that is 10:5F:81 — 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 INTENTSECURE Inc., located?

INTENTSECURE Inc., is listed at 717 HO, 42, Changeop-ro, Sujeong-gu Seongnam-si Gyeonggi-do KR 13449 in the IEEE OUI registry entry for 10:5F:81. This is the address the organization registered with the IEEE, which may differ from its current operating address.

INTENTSECURE Inc.,

MAC address prefix 10:5F:81 is registered to INTENTSECURE Inc., in the IEEE OUI registry. Any device whose MAC address begins with 10:5F:81 has a network interface built by INTENTSECURE 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 10:5F:81:00:00:00 to 10:5F:81:FF:FF:FF.

OUI prefix: 10:5F:81
Hyphen form: 10-5F-81
MAC range: 10:5F:81:00:00:00 – 10:5F:81:FF:FF:FF
Addresses in block: 16,777,216
Organization: INTENTSECURE Inc.,
Address: 717 HO, 42, Changeop-ro, Sujeong-gu Seongnam-si Gyeonggi-do KR 13449
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.

2024-08-27Assigned to "INTENTSECURE Inc.,"
archived source →
2026-07-17Assigned to "INTENTSECURE Inc.,"

Nearby in the registry

The prefixes assigned immediately before and after 10:5F:81:

FAQ

Which company owns MAC address prefix 10:5F:81?: MAC address prefix 10:5F:81 is registered to INTENTSECURE Inc., in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 10:5F:81 has a network interface built by INTENTSECURE Inc.,.
What is the OUI 10:5F:81?: 10:5F:81 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to INTENTSECURE Inc.,. It covers every address from 10:5F:81:00:00:00 to 10:5F:81:FF:FF:FF, or 16,777,216 addresses in total. It is also written 10-5F-81.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 10:5F:81:00:00:00 that is 10:5F:81 — 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 INTENTSECURE Inc., located?: INTENTSECURE Inc., is listed at 717 HO, 42, Changeop-ro, Sujeong-gu Seongnam-si Gyeonggi-do KR 13449 in the IEEE OUI registry entry for 10:5F:81. This is the address the organization registered with the IEEE, which may differ from its current operating address.