Which company owns MAC address prefix F0:77:65?

MAC address prefix F0:77:65 is registered to Sourcefire, Inc in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with F0:77:65 has a network interface built by Sourcefire, Inc.

What is the OUI F0:77:65?

F0:77:65 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Sourcefire, Inc. It covers every address from F0:77:65:00:00:00 to F0:77:65:FF:FF:FF, or 16,777,216 addresses in total. It is also written F0-77-65.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in F0:77:65:00:00:00 that is F0:77:65 — 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 Sourcefire, Inc located?

Sourcefire, Inc is listed at 9780 Patuxent Woods Drive Columbia Maryland US 21046 in the IEEE OUI registry entry for F0:77:65. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Sourcefire, Inc

MAC address prefix F0:77:65 is registered to Sourcefire, Inc in the IEEE OUI registry. Any device whose MAC address begins with F0:77:65 has a network interface built by Sourcefire, Inc. 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 F0:77:65:00:00:00 to F0:77:65:FF:FF:FF.

OUI prefix: F0:77:65
Hyphen form: F0-77-65
MAC range: F0:77:65:00:00:00 – F0:77:65:FF:FF:FF
Addresses in block: 16,777,216
Organization: Sourcefire, Inc
Address: 9780 Patuxent Woods Drive Columbia Maryland US 21046
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 "Sourcefire, Inc"
archived source →
2026-07-17Assigned to "Sourcefire, Inc"

Nearby in the registry

The prefixes assigned immediately before and after F0:77:65:

FAQ

Which company owns MAC address prefix F0:77:65?: MAC address prefix F0:77:65 is registered to Sourcefire, Inc in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with F0:77:65 has a network interface built by Sourcefire, Inc.
What is the OUI F0:77:65?: F0:77:65 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Sourcefire, Inc. It covers every address from F0:77:65:00:00:00 to F0:77:65:FF:FF:FF, or 16,777,216 addresses in total. It is also written F0-77-65.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in F0:77:65:00:00:00 that is F0:77:65 — 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 Sourcefire, Inc located?: Sourcefire, Inc is listed at 9780 Patuxent Woods Drive Columbia Maryland US 21046 in the IEEE OUI registry entry for F0:77:65. This is the address the organization registered with the IEEE, which may differ from its current operating address.