Which company owns MAC address prefix 3C:F7:D1?

MAC address prefix 3C:F7:D1 is registered to OMRON Corporation in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 3C:F7:D1 has a network interface built by OMRON Corporation.

What is the OUI 3C:F7:D1?

3C:F7:D1 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to OMRON Corporation. It covers every address from 3C:F7:D1:00:00:00 to 3C:F7:D1:FF:FF:FF, or 16,777,216 addresses in total. It is also written 3C-F7-D1.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 3C:F7:D1:00:00:00 that is 3C:F7:D1 — 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 OMRON Corporation located?

OMRON Corporation is listed at Shiokoji Horikawa, Shimogyo-ku Kyoto JP 600-8530 in the IEEE OUI registry entry for 3C:F7:D1. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does OMRON Corporation own?

OMRON Corporation holds 2 OUI prefixes in the IEEE registry, of which 3C:F7:D1 is one. A device made by OMRON Corporation could carry a MAC address from any of them.

OMRON Corporation

MAC address prefix 3C:F7:D1 is registered to OMRON Corporation in the IEEE OUI registry. Any device whose MAC address begins with 3C:F7:D1 has a network interface built by OMRON Corporation. 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 3C:F7:D1:00:00:00 to 3C:F7:D1:FF:FF:FF.

OUI prefix: 3C:F7:D1
Hyphen form: 3C-F7-D1
MAC range: 3C:F7:D1:00:00:00 – 3C:F7:D1:FF:FF:FF
Addresses in block: 16,777,216
Organization: OMRON Corporation
Address: Shiokoji Horikawa, Shimogyo-ku Kyoto JP 600-8530
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.

Other prefixes from OMRON Corporation

OMRON Corporation holds 2 OUI prefixes in total. A device with this exact prefix could just as well carry any of these:

80:B5:C6

Assignment history (1)

The IEEE registry publishes current state only — this is the change record we've kept since we started tracking it daily.

2026-07-17Assigned to "OMRON Corporation"

Nearby in the registry

The prefixes assigned immediately before and after 3C:F7:D1:

FAQ

Which company owns MAC address prefix 3C:F7:D1?: MAC address prefix 3C:F7:D1 is registered to OMRON Corporation in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 3C:F7:D1 has a network interface built by OMRON Corporation.
What is the OUI 3C:F7:D1?: 3C:F7:D1 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to OMRON Corporation. It covers every address from 3C:F7:D1:00:00:00 to 3C:F7:D1:FF:FF:FF, or 16,777,216 addresses in total. It is also written 3C-F7-D1.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 3C:F7:D1:00:00:00 that is 3C:F7:D1 — 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 OMRON Corporation located?: OMRON Corporation is listed at Shiokoji Horikawa, Shimogyo-ku Kyoto JP 600-8530 in the IEEE OUI registry entry for 3C:F7:D1. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does OMRON Corporation own?: OMRON Corporation holds 2 OUI prefixes in the IEEE registry, of which 3C:F7:D1 is one. A device made by OMRON Corporation could carry a MAC address from any of them.