Which company owns MAC address prefix 14:81:21?

MAC address prefix 14:81:21 is registered to TOP WING Corporation in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 14:81:21 has a network interface built by TOP WING Corporation.

What is the OUI 14:81:21?

14:81:21 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to TOP WING Corporation. It covers every address from 14:81:21:00:00:00 to 14:81:21:FF:FF:FF, or 16,777,216 addresses in total. It is also written 14-81-21.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 14:81:21:00:00:00 that is 14:81:21 — 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 TOP WING Corporation located?

TOP WING Corporation is listed at 1-10-2-1102 Sakae-cho Higashimurayama Tokyo JP 189-0013 in the IEEE OUI registry entry for 14:81:21. This is the address the organization registered with the IEEE, which may differ from its current operating address.

TOP WING Corporation

MAC address prefix 14:81:21 is registered to TOP WING Corporation in the IEEE OUI registry. Any device whose MAC address begins with 14:81:21 has a network interface built by TOP WING Corporation. 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 14:81:21:00:00:00 to 14:81:21:FF:FF:FF.

OUI prefix: 14:81:21
Hyphen form: 14-81-21
MAC range: 14:81:21:00:00:00 – 14:81:21:FF:FF:FF
Addresses in block: 16,777,216
Organization: TOP WING Corporation
Address: 1-10-2-1102 Sakae-cho Higashimurayama Tokyo JP 189-0013
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.

2025-02-27Assigned to "TOP WING Corporation"
archived source →
2026-07-17Assigned to "TOP WING Corporation"

Nearby in the registry

The prefixes assigned immediately before and after 14:81:21:

FAQ

Which company owns MAC address prefix 14:81:21?: MAC address prefix 14:81:21 is registered to TOP WING Corporation in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 14:81:21 has a network interface built by TOP WING Corporation.
What is the OUI 14:81:21?: 14:81:21 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to TOP WING Corporation. It covers every address from 14:81:21:00:00:00 to 14:81:21:FF:FF:FF, or 16,777,216 addresses in total. It is also written 14-81-21.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 14:81:21:00:00:00 that is 14:81:21 — 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 TOP WING Corporation located?: TOP WING Corporation is listed at 1-10-2-1102 Sakae-cho Higashimurayama Tokyo JP 189-0013 in the IEEE OUI registry entry for 14:81:21. This is the address the organization registered with the IEEE, which may differ from its current operating address.