Which company owns MAC address prefix 6C:9B:C0?

MAC address prefix 6C:9B:C0 is registered to Chemoptics Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 6C:9B:C0 has a network interface built by Chemoptics Inc..

What is the OUI 6C:9B:C0?

6C:9B:C0 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Chemoptics Inc.. It covers every address from 6C:9B:C0:00:00:00 to 6C:9B:C0:FF:FF:FF, or 16,777,216 addresses in total. It is also written 6C-9B-C0.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 6C:9B:C0:00:00:00 that is 6C:9B:C0 — 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 Chemoptics Inc. located?

Chemoptics Inc. is listed at 261, Techno 2-ro, Yuseong-gu Daejeon KR 34026 in the IEEE OUI registry entry for 6C:9B:C0. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Chemoptics Inc.

MAC address prefix 6C:9B:C0 is registered to Chemoptics Inc. in the IEEE OUI registry. Any device whose MAC address begins with 6C:9B:C0 has a network interface built by Chemoptics Inc.. 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 6C:9B:C0:00:00:00 to 6C:9B:C0:FF:FF:FF.

OUI prefix: 6C:9B:C0
Hyphen form: 6C-9B-C0
MAC range: 6C:9B:C0:00:00:00 – 6C:9B:C0:FF:FF:FF
Addresses in block: 16,777,216
Organization: Chemoptics Inc.
Address: 261, Techno 2-ro, Yuseong-gu Daejeon KR 34026
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.

2018-12-21Assigned to "Chemoptics Inc."
archived source →
2026-07-17Assigned to "Chemoptics Inc."

Nearby in the registry

The prefixes assigned immediately before and after 6C:9B:C0:

FAQ

Which company owns MAC address prefix 6C:9B:C0?: MAC address prefix 6C:9B:C0 is registered to Chemoptics Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 6C:9B:C0 has a network interface built by Chemoptics Inc..
What is the OUI 6C:9B:C0?: 6C:9B:C0 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Chemoptics Inc.. It covers every address from 6C:9B:C0:00:00:00 to 6C:9B:C0:FF:FF:FF, or 16,777,216 addresses in total. It is also written 6C-9B-C0.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 6C:9B:C0:00:00:00 that is 6C:9B:C0 — 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 Chemoptics Inc. located?: Chemoptics Inc. is listed at 261, Techno 2-ro, Yuseong-gu Daejeon KR 34026 in the IEEE OUI registry entry for 6C:9B:C0. This is the address the organization registered with the IEEE, which may differ from its current operating address.