Which company owns MAC address prefix D8:E9:52?

MAC address prefix D8:E9:52 is registered to KEOPSYS in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with D8:E9:52 has a network interface built by KEOPSYS.

What is the OUI D8:E9:52?

D8:E9:52 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to KEOPSYS. It covers every address from D8:E9:52:00:00:00 to D8:E9:52:FF:FF:FF, or 16,777,216 addresses in total. It is also written D8-E9-52.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in D8:E9:52:00:00:00 that is D8:E9:52 — 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 KEOPSYS located?

KEOPSYS is listed at 21 RUE LOUIS DE BROGLIE LANNION BRITANY FR 22300 in the IEEE OUI registry entry for D8:E9:52. This is the address the organization registered with the IEEE, which may differ from its current operating address.

KEOPSYS

MAC address prefix D8:E9:52 is registered to KEOPSYS in the IEEE OUI registry. Any device whose MAC address begins with D8:E9:52 has a network interface built by KEOPSYS. 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 D8:E9:52:00:00:00 to D8:E9:52:FF:FF:FF.

OUI prefix: D8:E9:52
Hyphen form: D8-E9-52
MAC range: D8:E9:52:00:00:00 – D8:E9:52:FF:FF:FF
Addresses in block: 16,777,216
Organization: KEOPSYS
Address: 21 RUE LOUIS DE BROGLIE LANNION BRITANY FR 22300
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 "KEOPSYS"
archived source →
2026-07-17Assigned to "KEOPSYS"

Nearby in the registry

The prefixes assigned immediately before and after D8:E9:52:

FAQ

Which company owns MAC address prefix D8:E9:52?: MAC address prefix D8:E9:52 is registered to KEOPSYS in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with D8:E9:52 has a network interface built by KEOPSYS.
What is the OUI D8:E9:52?: D8:E9:52 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to KEOPSYS. It covers every address from D8:E9:52:00:00:00 to D8:E9:52:FF:FF:FF, or 16,777,216 addresses in total. It is also written D8-E9-52.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in D8:E9:52:00:00:00 that is D8:E9:52 — 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 KEOPSYS located?: KEOPSYS is listed at 21 RUE LOUIS DE BROGLIE LANNION BRITANY FR 22300 in the IEEE OUI registry entry for D8:E9:52. This is the address the organization registered with the IEEE, which may differ from its current operating address.