Which company owns MAC address prefix 00:CB:BD?

MAC address prefix 00:CB:BD is registered to Cambridge Broadband Networks Group in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 00:CB:BD has a network interface built by Cambridge Broadband Networks Group.

What is the OUI 00:CB:BD?

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

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 00:CB:BD:00:00:00 that is 00:CB:BD — 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 Cambridge Broadband Networks Group located?

Cambridge Broadband Networks Group is listed at 1 Hammersmith Broadway London GB W6 9DL in the IEEE OUI registry entry for 00:CB:BD. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Cambridge Broadband Networks Group

MAC address prefix 00:CB:BD is registered to Cambridge Broadband Networks Group in the IEEE OUI registry. Any device whose MAC address begins with 00:CB:BD has a network interface built by Cambridge Broadband Networks Group. 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 00:CB:BD:00:00:00 to 00:CB:BD:FF:FF:FF.

OUI prefix: 00:CB:BD
Hyphen form: 00-CB-BD
MAC range: 00:CB:BD:00:00:00 – 00:CB:BD:FF:FF:FF
Addresses in block: 16,777,216
Organization: Cambridge Broadband Networks Group
Address: 1 Hammersmith Broadway London GB W6 9DL
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 (3)

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 "Cambridge Broadband Networks Ltd."
archived source →
2020-08-05Renamed from "Cambridge Broadband Networks Ltd." to "Cambridge Broadband Networks Group"
archived source →
2026-07-17Assigned to "Cambridge Broadband Networks Group"

Nearby in the registry

The prefixes assigned immediately before and after 00:CB:BD:

FAQ

Which company owns MAC address prefix 00:CB:BD?: MAC address prefix 00:CB:BD is registered to Cambridge Broadband Networks Group in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 00:CB:BD has a network interface built by Cambridge Broadband Networks Group.
What is the OUI 00:CB:BD?: 00:CB:BD is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Cambridge Broadband Networks Group. It covers every address from 00:CB:BD:00:00:00 to 00:CB:BD:FF:FF:FF, or 16,777,216 addresses in total. It is also written 00-CB-BD.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 00:CB:BD:00:00:00 that is 00:CB:BD — 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 Cambridge Broadband Networks Group located?: Cambridge Broadband Networks Group is listed at 1 Hammersmith Broadway London GB W6 9DL in the IEEE OUI registry entry for 00:CB:BD. This is the address the organization registered with the IEEE, which may differ from its current operating address.