Which company owns MAC address prefix 40:12:E4?

MAC address prefix 40:12:E4 is registered to Compass-EOS in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 40:12:E4 has a network interface built by Compass-EOS.

What is the OUI 40:12:E4?

40:12:E4 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Compass-EOS. It covers every address from 40:12:E4:00:00:00 to 40:12:E4:FF:FF:FF, or 16,777,216 addresses in total. It is also written 40-12-E4.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 40:12:E4:00:00:00 that is 40:12:E4 — 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 Compass-EOS located?

Compass-EOS is listed at 7 Giborei Israel Natanya IL 42504 in the IEEE OUI registry entry for 40:12:E4. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Compass-EOS

MAC address prefix 40:12:E4 is registered to Compass-EOS in the IEEE OUI registry. Any device whose MAC address begins with 40:12:E4 has a network interface built by Compass-EOS. 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 40:12:E4:00:00:00 to 40:12:E4:FF:FF:FF.

OUI prefix: 40:12:E4
Hyphen form: 40-12-E4
MAC range: 40:12:E4:00:00:00 – 40:12:E4:FF:FF:FF
Addresses in block: 16,777,216
Organization: Compass-EOS
Address: 7 Giborei Israel Natanya IL 42504
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 "Compass-EOS"
archived source →
2026-07-17Assigned to "Compass-EOS"

Nearby in the registry

The prefixes assigned immediately before and after 40:12:E4:

FAQ

Which company owns MAC address prefix 40:12:E4?: MAC address prefix 40:12:E4 is registered to Compass-EOS in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 40:12:E4 has a network interface built by Compass-EOS.
What is the OUI 40:12:E4?: 40:12:E4 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Compass-EOS. It covers every address from 40:12:E4:00:00:00 to 40:12:E4:FF:FF:FF, or 16,777,216 addresses in total. It is also written 40-12-E4.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 40:12:E4:00:00:00 that is 40:12:E4 — 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 Compass-EOS located?: Compass-EOS is listed at 7 Giborei Israel Natanya IL 42504 in the IEEE OUI registry entry for 40:12:E4. This is the address the organization registered with the IEEE, which may differ from its current operating address.