Which company owns MAC address prefix 68:CA:00?

MAC address prefix 68:CA:00 is registered to Octopus Systems Limited in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 68:CA:00 has a network interface built by Octopus Systems Limited.

What is the OUI 68:CA:00?

68:CA:00 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Octopus Systems Limited. It covers every address from 68:CA:00:00:00:00 to 68:CA:00:FF:FF:FF, or 16,777,216 addresses in total. It is also written 68-CA-00.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 68:CA:00:00:00:00 that is 68:CA:00 — 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 Octopus Systems Limited located?

Octopus Systems Limited is listed at 36/F, 148 Electric Road HK in the IEEE OUI registry entry for 68:CA:00. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Octopus Systems Limited

MAC address prefix 68:CA:00 is registered to Octopus Systems Limited in the IEEE OUI registry. Any device whose MAC address begins with 68:CA:00 has a network interface built by Octopus Systems Limited. 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 68:CA:00:00:00:00 to 68:CA:00:FF:FF:FF.

OUI prefix: 68:CA:00
Hyphen form: 68-CA-00
MAC range: 68:CA:00:00:00:00 – 68:CA:00:FF:FF:FF
Addresses in block: 16,777,216
Organization: Octopus Systems Limited
Address: 36/F, 148 Electric Road HK
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 "Octopus Systems Limited"
archived source →
2026-07-17Assigned to "Octopus Systems Limited"

Nearby in the registry

The prefixes assigned immediately before and after 68:CA:00:

FAQ

Which company owns MAC address prefix 68:CA:00?: MAC address prefix 68:CA:00 is registered to Octopus Systems Limited in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 68:CA:00 has a network interface built by Octopus Systems Limited.
What is the OUI 68:CA:00?: 68:CA:00 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Octopus Systems Limited. It covers every address from 68:CA:00:00:00:00 to 68:CA:00:FF:FF:FF, or 16,777,216 addresses in total. It is also written 68-CA-00.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 68:CA:00:00:00:00 that is 68:CA:00 — 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 Octopus Systems Limited located?: Octopus Systems Limited is listed at 36/F, 148 Electric Road HK in the IEEE OUI registry entry for 68:CA:00. This is the address the organization registered with the IEEE, which may differ from its current operating address.