Which company owns MAC address prefix D0:DB:B7?

MAC address prefix D0:DB:B7 is registered to Casa Systems in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with D0:DB:B7 has a network interface built by Casa Systems.

What is the OUI D0:DB:B7?

D0:DB:B7 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Casa Systems. It covers every address from D0:DB:B7:00:00:00 to D0:DB:B7:FF:FF:FF, or 16,777,216 addresses in total. It is also written D0-DB-B7.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in D0:DB:B7:00:00:00 that is D0:DB:B7 — 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 Casa Systems located?

Casa Systems is listed at 18-20 Orion Road Lane Cove West LANE COVE NSW AU 2066 in the IEEE OUI registry entry for D0:DB:B7. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does Casa Systems own?

Casa Systems holds 2 OUI prefixes in the IEEE registry, of which D0:DB:B7 is one. A device made by Casa Systems could carry a MAC address from any of them.

Casa Systems

MAC address prefix D0:DB:B7 is registered to Casa Systems in the IEEE OUI registry. Any device whose MAC address begins with D0:DB:B7 has a network interface built by Casa Systems. 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 D0:DB:B7:00:00:00 to D0:DB:B7:FF:FF:FF.

OUI prefix: D0:DB:B7
Hyphen form: D0-DB-B7
MAC range: D0:DB:B7:00:00:00 – D0:DB:B7:FF:FF:FF
Addresses in block: 16,777,216
Organization: Casa Systems
Address: 18-20 Orion Road Lane Cove West LANE COVE NSW AU 2066
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 Casa Systems

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

F0:2E:51

Assignment history (2)

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

2021-06-10Assigned to "Casa Systems"
archived source →
2026-07-17Assigned to "Casa Systems"

Nearby in the registry

The prefixes assigned immediately before and after D0:DB:B7:

FAQ

Which company owns MAC address prefix D0:DB:B7?: MAC address prefix D0:DB:B7 is registered to Casa Systems in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with D0:DB:B7 has a network interface built by Casa Systems.
What is the OUI D0:DB:B7?: D0:DB:B7 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Casa Systems. It covers every address from D0:DB:B7:00:00:00 to D0:DB:B7:FF:FF:FF, or 16,777,216 addresses in total. It is also written D0-DB-B7.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in D0:DB:B7:00:00:00 that is D0:DB:B7 — 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 Casa Systems located?: Casa Systems is listed at 18-20 Orion Road Lane Cove West LANE COVE NSW AU 2066 in the IEEE OUI registry entry for D0:DB:B7. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does Casa Systems own?: Casa Systems holds 2 OUI prefixes in the IEEE registry, of which D0:DB:B7 is one. A device made by Casa Systems could carry a MAC address from any of them.