Which company owns MAC address prefix AC:02:EF?

MAC address prefix AC:02:EF is registered to Comsis in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with AC:02:EF has a network interface built by Comsis.

What is the OUI AC:02:EF?

AC:02:EF is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Comsis. It covers every address from AC:02:EF:00:00:00 to AC:02:EF:FF:FF:FF, or 16,777,216 addresses in total. It is also written AC-02-EF.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in AC:02:EF:00:00:00 that is AC:02:EF — 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 Comsis located?

Comsis is listed at 3 rue Broussais Paris FR 75014 in the IEEE OUI registry entry for AC:02:EF. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Comsis

MAC address prefix AC:02:EF is registered to Comsis in the IEEE OUI registry. Any device whose MAC address begins with AC:02:EF has a network interface built by Comsis. 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 AC:02:EF:00:00:00 to AC:02:EF:FF:FF:FF.

OUI prefix: AC:02:EF
Hyphen form: AC-02-EF
MAC range: AC:02:EF:00:00:00 – AC:02:EF:FF:FF:FF
Addresses in block: 16,777,216
Organization: Comsis
Address: 3 rue Broussais Paris FR 75014
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 "Comsis"
archived source →
2026-07-17Assigned to "Comsis"

Nearby in the registry

The prefixes assigned immediately before and after AC:02:EF:

FAQ

Which company owns MAC address prefix AC:02:EF?: MAC address prefix AC:02:EF is registered to Comsis in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with AC:02:EF has a network interface built by Comsis.
What is the OUI AC:02:EF?: AC:02:EF is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Comsis. It covers every address from AC:02:EF:00:00:00 to AC:02:EF:FF:FF:FF, or 16,777,216 addresses in total. It is also written AC-02-EF.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in AC:02:EF:00:00:00 that is AC:02:EF — 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 Comsis located?: Comsis is listed at 3 rue Broussais Paris FR 75014 in the IEEE OUI registry entry for AC:02:EF. This is the address the organization registered with the IEEE, which may differ from its current operating address.