Which company owns MAC address prefix 00:18:36?

MAC address prefix 00:18:36 is registered to REJ Co.,Ltd in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 00:18:36 has a network interface built by REJ Co.,Ltd.

What is the OUI 00:18:36?

00:18:36 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to REJ Co.,Ltd. It covers every address from 00:18:36:00:00:00 to 00:18:36:FF:FF:FF, or 16,777,216 addresses in total. It is also written 00-18-36.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 00:18:36:00:00:00 that is 00:18:36 — 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 REJ Co.,Ltd located?

REJ Co.,Ltd is listed at 2-3-2 Fukuura, Kanazawa-ku Yokohama Kanagawa JP 236-8641 in the IEEE OUI registry entry for 00:18:36. This is the address the organization registered with the IEEE, which may differ from its current operating address.

REJ Co.,Ltd

MAC address prefix 00:18:36 is registered to REJ Co.,Ltd in the IEEE OUI registry. Any device whose MAC address begins with 00:18:36 has a network interface built by REJ 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 00:18:36:00:00:00 to 00:18:36:FF:FF:FF.

OUI prefix: 00:18:36
Hyphen form: 00-18-36
MAC range: 00:18:36:00:00:00 – 00:18:36:FF:FF:FF
Addresses in block: 16,777,216
Organization: REJ Co.,Ltd
Address: 2-3-2 Fukuura, Kanazawa-ku Yokohama Kanagawa JP 236-8641
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 (3)

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 "Reliance Electric Limited"
archived source →
2019-07-04Renamed from "Reliance Electric Limited" to "REJ Co.,Ltd"
archived source →
2026-07-17Assigned to "REJ Co.,Ltd"

Nearby in the registry

The prefixes assigned immediately before and after 00:18:36:

FAQ

Which company owns MAC address prefix 00:18:36?: MAC address prefix 00:18:36 is registered to REJ Co.,Ltd in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 00:18:36 has a network interface built by REJ Co.,Ltd.
What is the OUI 00:18:36?: 00:18:36 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to REJ Co.,Ltd. It covers every address from 00:18:36:00:00:00 to 00:18:36:FF:FF:FF, or 16,777,216 addresses in total. It is also written 00-18-36.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 00:18:36:00:00:00 that is 00:18:36 — 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 REJ Co.,Ltd located?: REJ Co.,Ltd is listed at 2-3-2 Fukuura, Kanazawa-ku Yokohama Kanagawa JP 236-8641 in the IEEE OUI registry entry for 00:18:36. This is the address the organization registered with the IEEE, which may differ from its current operating address.