Which company owns MAC address prefix F8:90:66?

MAC address prefix F8:90:66 is registered to Nain Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with F8:90:66 has a network interface built by Nain Inc..

What is the OUI F8:90:66?

F8:90:66 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Nain Inc.. It covers every address from F8:90:66:00:00:00 to F8:90:66:FF:FF:FF, or 16,777,216 addresses in total. It is also written F8-90-66.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in F8:90:66:00:00:00 that is F8:90:66 — 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 Nain Inc. located?

Nain Inc. is listed at Aoyamadai building 902, Shibuya 2-9-10, Shibuya-ku Tokyo JP 150-0002 in the IEEE OUI registry entry for F8:90:66. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Nain Inc.

MAC address prefix F8:90:66 is registered to Nain Inc. in the IEEE OUI registry. Any device whose MAC address begins with F8:90:66 has a network interface built by Nain 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 F8:90:66:00:00:00 to F8:90:66:FF:FF:FF.

OUI prefix: F8:90:66
Hyphen form: F8-90-66
MAC range: F8:90:66:00:00:00 – F8:90:66:FF:FF:FF
Addresses in block: 16,777,216
Organization: Nain Inc.
Address: Aoyamadai building 902, Shibuya 2-9-10, Shibuya-ku Tokyo JP 150-0002
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.

2018-12-21Assigned to "Nain Inc."
archived source →
2026-07-17Assigned to "Nain Inc."

Nearby in the registry

The prefixes assigned immediately before and after F8:90:66:

FAQ

Which company owns MAC address prefix F8:90:66?: MAC address prefix F8:90:66 is registered to Nain Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with F8:90:66 has a network interface built by Nain Inc..
What is the OUI F8:90:66?: F8:90:66 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Nain Inc.. It covers every address from F8:90:66:00:00:00 to F8:90:66:FF:FF:FF, or 16,777,216 addresses in total. It is also written F8-90-66.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in F8:90:66:00:00:00 that is F8:90:66 — 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 Nain Inc. located?: Nain Inc. is listed at Aoyamadai building 902, Shibuya 2-9-10, Shibuya-ku Tokyo JP 150-0002 in the IEEE OUI registry entry for F8:90:66. This is the address the organization registered with the IEEE, which may differ from its current operating address.