Which company owns MAC address prefix F0:2E:51?

MAC address prefix F0:2E:51 is registered to Casa Systems in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with F0:2E:51 has a network interface built by Casa Systems.

What is the OUI F0:2E:51?

F0:2E:51 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 F0:2E:51:00:00:00 to F0:2E:51:FF:FF:FF, or 16,777,216 addresses in total. It is also written F0-2E-51.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in F0:2E:51:00:00:00 that is F0:2E:51 — 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 F0:2E:51. 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 F0:2E:51 is one. A device made by Casa Systems could carry a MAC address from any of them.

Casa Systems

MAC address prefix F0:2E:51 is registered to Casa Systems in the IEEE OUI registry. Any device whose MAC address begins with F0:2E:51 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 F0:2E:51:00:00:00 to F0:2E:51:FF:FF:FF.

OUI prefix: F0:2E:51
Hyphen form: F0-2E-51
MAC range: F0:2E:51:00:00:00 – F0:2E:51: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:

D0:DB:B7

Assignment history (2)

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

2020-04-23Assigned to "Casa Systems"
archived source →
2026-07-17Assigned to "Casa Systems"

Nearby in the registry

The prefixes assigned immediately before and after F0:2E:51:

FAQ

Which company owns MAC address prefix F0:2E:51?: MAC address prefix F0:2E:51 is registered to Casa Systems in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with F0:2E:51 has a network interface built by Casa Systems.
What is the OUI F0:2E:51?: F0:2E:51 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 F0:2E:51:00:00:00 to F0:2E:51:FF:FF:FF, or 16,777,216 addresses in total. It is also written F0-2E-51.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in F0:2E:51:00:00:00 that is F0:2E:51 — 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 F0:2E:51. 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 F0:2E:51 is one. A device made by Casa Systems could carry a MAC address from any of them.