Which company owns MAC address prefix 40:B0:A1?

MAC address prefix 40:B0:A1 is registered to VALCOM CO.,LTD. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 40:B0:A1 has a network interface built by VALCOM CO.,LTD..

What is the OUI 40:B0:A1?

40:B0:A1 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to VALCOM CO.,LTD.. It covers every address from 40:B0:A1:00:00:00 to 40:B0:A1:FF:FF:FF, or 16,777,216 addresses in total. It is also written 40-B0-A1.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 40:B0:A1:00:00:00 that is 40:B0:A1 — 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 VALCOM CO.,LTD. located?

VALCOM CO.,LTD. is listed at 7-25 MINOWA 3-CHOME TOYONAKA CITY,OSAKA JP 560-0035 in the IEEE OUI registry entry for 40:B0:A1. This is the address the organization registered with the IEEE, which may differ from its current operating address.

VALCOM CO.,LTD.

MAC address prefix 40:B0:A1 is registered to VALCOM CO.,LTD. in the IEEE OUI registry. Any device whose MAC address begins with 40:B0:A1 has a network interface built by VALCOM 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 40:B0:A1:00:00:00 to 40:B0:A1:FF:FF:FF.

OUI prefix: 40:B0:A1
Hyphen form: 40-B0-A1
MAC range: 40:B0:A1:00:00:00 – 40:B0:A1:FF:FF:FF
Addresses in block: 16,777,216
Organization: VALCOM CO.,LTD.
Address: 7-25 MINOWA 3-CHOME TOYONAKA CITY,OSAKA JP 560-0035
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 (1)

The IEEE registry publishes current state only — this is the change record we've kept since we started tracking it daily.

2026-07-17Assigned to "VALCOM CO.,LTD."

Nearby in the registry

The prefixes assigned immediately before and after 40:B0:A1:

FAQ

Which company owns MAC address prefix 40:B0:A1?: MAC address prefix 40:B0:A1 is registered to VALCOM CO.,LTD. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 40:B0:A1 has a network interface built by VALCOM CO.,LTD..
What is the OUI 40:B0:A1?: 40:B0:A1 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to VALCOM CO.,LTD.. It covers every address from 40:B0:A1:00:00:00 to 40:B0:A1:FF:FF:FF, or 16,777,216 addresses in total. It is also written 40-B0-A1.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 40:B0:A1:00:00:00 that is 40:B0:A1 — 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 VALCOM CO.,LTD. located?: VALCOM CO.,LTD. is listed at 7-25 MINOWA 3-CHOME TOYONAKA CITY,OSAKA JP 560-0035 in the IEEE OUI registry entry for 40:B0:A1. This is the address the organization registered with the IEEE, which may differ from its current operating address.