Which company owns MAC address prefix 98:3B:8A?

MAC address prefix 98:3B:8A is registered to Sekisui Jushi CAP-AI System Co.,Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 98:3B:8A has a network interface built by Sekisui Jushi CAP-AI System Co.,Ltd..

What is the OUI 98:3B:8A?

98:3B:8A is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Sekisui Jushi CAP-AI System Co.,Ltd.. It covers every address from 98:3B:8A:00:00:00 to 98:3B:8A:FF:FF:FF, or 16,777,216 addresses in total. It is also written 98-3B-8A.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 98:3B:8A:00:00:00 that is 98:3B:8A — 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 Sekisui Jushi CAP-AI System Co.,Ltd. located?

Sekisui Jushi CAP-AI System Co.,Ltd. is listed at Mandai Mita Building 2F,3-2-3 Mita, Minato-ku Tokyo JP 108-0073 in the IEEE OUI registry entry for 98:3B:8A. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Sekisui Jushi CAP-AI System Co.,Ltd.

MAC address prefix 98:3B:8A is registered to Sekisui Jushi CAP-AI System Co.,Ltd. in the IEEE OUI registry. Any device whose MAC address begins with 98:3B:8A has a network interface built by Sekisui Jushi CAP-AI System 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 98:3B:8A:00:00:00 to 98:3B:8A:FF:FF:FF.

OUI prefix: 98:3B:8A
Hyphen form: 98-3B-8A
MAC range: 98:3B:8A:00:00:00 – 98:3B:8A:FF:FF:FF
Addresses in block: 16,777,216
Organization: Sekisui Jushi CAP-AI System Co.,Ltd.
Address: Mandai Mita Building 2F,3-2-3 Mita, Minato-ku Tokyo JP 108-0073
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.

2026-06-20Assigned to "Sekisui Jushi CAP-AI System Co.,Ltd."
archived source →
2026-07-17Assigned to "Sekisui Jushi CAP-AI System Co.,Ltd."

Nearby in the registry

The prefixes assigned immediately before and after 98:3B:8A:

FAQ

Which company owns MAC address prefix 98:3B:8A?: MAC address prefix 98:3B:8A is registered to Sekisui Jushi CAP-AI System Co.,Ltd. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 98:3B:8A has a network interface built by Sekisui Jushi CAP-AI System Co.,Ltd..
What is the OUI 98:3B:8A?: 98:3B:8A is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Sekisui Jushi CAP-AI System Co.,Ltd.. It covers every address from 98:3B:8A:00:00:00 to 98:3B:8A:FF:FF:FF, or 16,777,216 addresses in total. It is also written 98-3B-8A.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 98:3B:8A:00:00:00 that is 98:3B:8A — 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 Sekisui Jushi CAP-AI System Co.,Ltd. located?: Sekisui Jushi CAP-AI System Co.,Ltd. is listed at Mandai Mita Building 2F,3-2-3 Mita, Minato-ku Tokyo JP 108-0073 in the IEEE OUI registry entry for 98:3B:8A. This is the address the organization registered with the IEEE, which may differ from its current operating address.