Which company owns MAC address prefix 6C:3B:6B?

MAC address prefix 6C:3B:6B is registered to Routerboard.com in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 6C:3B:6B has a network interface built by Routerboard.com.

What is the OUI 6C:3B:6B?

6C:3B:6B is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Routerboard.com. It covers every address from 6C:3B:6B:00:00:00 to 6C:3B:6B:FF:FF:FF, or 16,777,216 addresses in total. It is also written 6C-3B-6B.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 6C:3B:6B:00:00:00 that is 6C:3B:6B — 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 Routerboard.com located?

Routerboard.com is listed at Mikrotikls SIA Riga Riga LV LV1009 in the IEEE OUI registry entry for 6C:3B:6B. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does Routerboard.com own?

Routerboard.com holds 22 OUI prefixes in the IEEE registry, of which 6C:3B:6B is one. A device made by Routerboard.com could carry a MAC address from any of them.

Routerboard.com

MAC address prefix 6C:3B:6B is registered to Routerboard.com in the IEEE OUI registry. Any device whose MAC address begins with 6C:3B:6B has a network interface built by Routerboard.com. 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:3B:6B:00:00:00 to 6C:3B:6B:FF:FF:FF.

OUI prefix: 6C:3B:6B
Hyphen form: 6C-3B-6B
MAC range: 6C:3B:6B:00:00:00 – 6C:3B:6B:FF:FF:FF
Addresses in block: 16,777,216
Organization: Routerboard.com
Address: Mikrotikls SIA Riga Riga LV LV1009
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 Routerboard.com

Routerboard.com holds 22 OUI prefixes in total. A device with this exact prefix could just as well carry any of these:

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 "Routerboard.com"
archived source →
2026-07-17Assigned to "Routerboard.com"

Nearby in the registry

The prefixes assigned immediately before and after 6C:3B:6B:

FAQ

Which company owns MAC address prefix 6C:3B:6B?: MAC address prefix 6C:3B:6B is registered to Routerboard.com in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 6C:3B:6B has a network interface built by Routerboard.com.
What is the OUI 6C:3B:6B?: 6C:3B:6B is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Routerboard.com. It covers every address from 6C:3B:6B:00:00:00 to 6C:3B:6B:FF:FF:FF, or 16,777,216 addresses in total. It is also written 6C-3B-6B.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 6C:3B:6B:00:00:00 that is 6C:3B:6B — 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 Routerboard.com located?: Routerboard.com is listed at Mikrotikls SIA Riga Riga LV LV1009 in the IEEE OUI registry entry for 6C:3B:6B. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does Routerboard.com own?: Routerboard.com holds 22 OUI prefixes in the IEEE registry, of which 6C:3B:6B is one. A device made by Routerboard.com could carry a MAC address from any of them.