Which company owns MAC address prefix F4:B5:BB?

MAC address prefix F4:B5:BB is registered to CERAGON NETWORKS in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with F4:B5:BB has a network interface built by CERAGON NETWORKS.

What is the OUI F4:B5:BB?

F4:B5:BB is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to CERAGON NETWORKS. It covers every address from F4:B5:BB:00:00:00 to F4:B5:BB:FF:FF:FF, or 16,777,216 addresses in total. It is also written F4-B5-BB.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in F4:B5:BB:00:00:00 that is F4:B5:BB — 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 CERAGON NETWORKS located?

CERAGON NETWORKS is listed at 24 RAUEL WALLENBERG STREET TEL-AVIV IL 96719 in the IEEE OUI registry entry for F4:B5:BB. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does CERAGON NETWORKS own?

CERAGON NETWORKS holds 3 OUI prefixes in the IEEE registry, of which F4:B5:BB is one. A device made by CERAGON NETWORKS could carry a MAC address from any of them.

CERAGON NETWORKS

MAC address prefix F4:B5:BB is registered to CERAGON NETWORKS in the IEEE OUI registry. Any device whose MAC address begins with F4:B5:BB has a network interface built by CERAGON NETWORKS. 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 F4:B5:BB:00:00:00 to F4:B5:BB:FF:FF:FF.

OUI prefix: F4:B5:BB
Hyphen form: F4-B5-BB
MAC range: F4:B5:BB:00:00:00 – F4:B5:BB:FF:FF:FF
Addresses in block: 16,777,216
Organization: CERAGON NETWORKS
Address: 24 RAUEL WALLENBERG STREET TEL-AVIV IL 96719
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 CERAGON NETWORKS

CERAGON NETWORKS holds 3 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.

2019-07-04Assigned to "CERAGON NETWORKS"
archived source →
2026-07-17Assigned to "CERAGON NETWORKS"

Nearby in the registry

The prefixes assigned immediately before and after F4:B5:BB:

FAQ

Which company owns MAC address prefix F4:B5:BB?: MAC address prefix F4:B5:BB is registered to CERAGON NETWORKS in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with F4:B5:BB has a network interface built by CERAGON NETWORKS.
What is the OUI F4:B5:BB?: F4:B5:BB is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to CERAGON NETWORKS. It covers every address from F4:B5:BB:00:00:00 to F4:B5:BB:FF:FF:FF, or 16,777,216 addresses in total. It is also written F4-B5-BB.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in F4:B5:BB:00:00:00 that is F4:B5:BB — 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 CERAGON NETWORKS located?: CERAGON NETWORKS is listed at 24 RAUEL WALLENBERG STREET TEL-AVIV IL 96719 in the IEEE OUI registry entry for F4:B5:BB. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does CERAGON NETWORKS own?: CERAGON NETWORKS holds 3 OUI prefixes in the IEEE registry, of which F4:B5:BB is one. A device made by CERAGON NETWORKS could carry a MAC address from any of them.