Which company owns MAC address prefix EC:D9:25?

MAC address prefix EC:D9:25 is registered to RAMI in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with EC:D9:25 has a network interface built by RAMI.

What is the OUI EC:D9:25?

EC:D9:25 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to RAMI. It covers every address from EC:D9:25:00:00:00 to EC:D9:25:FF:FF:FF, or 16,777,216 addresses in total. It is also written EC-D9-25.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in EC:D9:25:00:00:00 that is EC:D9:25 — 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 RAMI located?

RAMI is listed at 7 RUE RAOUL FOLLEREAU BUSSY ST GEORGES FR 77600 in the IEEE OUI registry entry for EC:D9:25. This is the address the organization registered with the IEEE, which may differ from its current operating address.

RAMI

MAC address prefix EC:D9:25 is registered to RAMI in the IEEE OUI registry. Any device whose MAC address begins with EC:D9:25 has a network interface built by RAMI. 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 EC:D9:25:00:00:00 to EC:D9:25:FF:FF:FF.

OUI prefix: EC:D9:25
Hyphen form: EC-D9-25
MAC range: EC:D9:25:00:00:00 – EC:D9:25:FF:FF:FF
Addresses in block: 16,777,216
Organization: RAMI
Address: 7 RUE RAOUL FOLLEREAU BUSSY ST GEORGES FR 77600
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 "RAMI"
archived source →
2026-07-17Assigned to "RAMI"

Nearby in the registry

The prefixes assigned immediately before and after EC:D9:25:

FAQ

Which company owns MAC address prefix EC:D9:25?: MAC address prefix EC:D9:25 is registered to RAMI in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with EC:D9:25 has a network interface built by RAMI.
What is the OUI EC:D9:25?: EC:D9:25 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to RAMI. It covers every address from EC:D9:25:00:00:00 to EC:D9:25:FF:FF:FF, or 16,777,216 addresses in total. It is also written EC-D9-25.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in EC:D9:25:00:00:00 that is EC:D9:25 — 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 RAMI located?: RAMI is listed at 7 RUE RAOUL FOLLEREAU BUSSY ST GEORGES FR 77600 in the IEEE OUI registry entry for EC:D9:25. This is the address the organization registered with the IEEE, which may differ from its current operating address.