Which company owns MAC address prefix 10:A1:3B?

MAC address prefix 10:A1:3B is registered to FUJIKURA RUBBER LTD. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 10:A1:3B has a network interface built by FUJIKURA RUBBER LTD..

What is the OUI 10:A1:3B?

10:A1:3B is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to FUJIKURA RUBBER LTD.. It covers every address from 10:A1:3B:00:00:00 to 10:A1:3B:FF:FF:FF, or 16,777,216 addresses in total. It is also written 10-A1-3B.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 10:A1:3B:00:00:00 that is 10:A1:3B — 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 FUJIKURA RUBBER LTD. located?

FUJIKURA RUBBER LTD. is listed at 1-840,Mihashi,Omiya Saitama JP 330-0856 in the IEEE OUI registry entry for 10:A1:3B. This is the address the organization registered with the IEEE, which may differ from its current operating address.

FUJIKURA RUBBER LTD.

MAC address prefix 10:A1:3B is registered to FUJIKURA RUBBER LTD. in the IEEE OUI registry. Any device whose MAC address begins with 10:A1:3B has a network interface built by FUJIKURA RUBBER 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 10:A1:3B:00:00:00 to 10:A1:3B:FF:FF:FF.

OUI prefix: 10:A1:3B
Hyphen form: 10-A1-3B
MAC range: 10:A1:3B:00:00:00 – 10:A1:3B:FF:FF:FF
Addresses in block: 16,777,216
Organization: FUJIKURA RUBBER LTD.
Address: 1-840,Mihashi,Omiya Saitama JP 330-0856
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 "FUJIKURA RUBBER LTD."
archived source →
2026-07-17Assigned to "FUJIKURA RUBBER LTD."

Nearby in the registry

The prefixes assigned immediately before and after 10:A1:3B:

FAQ

Which company owns MAC address prefix 10:A1:3B?: MAC address prefix 10:A1:3B is registered to FUJIKURA RUBBER LTD. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 10:A1:3B has a network interface built by FUJIKURA RUBBER LTD..
What is the OUI 10:A1:3B?: 10:A1:3B is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to FUJIKURA RUBBER LTD.. It covers every address from 10:A1:3B:00:00:00 to 10:A1:3B:FF:FF:FF, or 16,777,216 addresses in total. It is also written 10-A1-3B.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 10:A1:3B:00:00:00 that is 10:A1:3B — 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 FUJIKURA RUBBER LTD. located?: FUJIKURA RUBBER LTD. is listed at 1-840,Mihashi,Omiya Saitama JP 330-0856 in the IEEE OUI registry entry for 10:A1:3B. This is the address the organization registered with the IEEE, which may differ from its current operating address.