Which company owns MAC address prefix F8:99:55?

MAC address prefix F8:99:55 is registered to Fortress Technology Inc in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with F8:99:55 has a network interface built by Fortress Technology Inc.

What is the OUI F8:99:55?

F8:99:55 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Fortress Technology Inc. It covers every address from F8:99:55:00:00:00 to F8:99:55:FF:FF:FF, or 16,777,216 addresses in total. It is also written F8-99-55.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in F8:99:55:00:00:00 that is F8:99:55 — 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 Fortress Technology Inc located?

Fortress Technology Inc is listed at 51 Grand Marshall Drive Scarborough Ontario CA M1B 5N6 in the IEEE OUI registry entry for F8:99:55. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Fortress Technology Inc

MAC address prefix F8:99:55 is registered to Fortress Technology Inc in the IEEE OUI registry. Any device whose MAC address begins with F8:99:55 has a network interface built by Fortress Technology 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 F8:99:55:00:00:00 to F8:99:55:FF:FF:FF.

OUI prefix: F8:99:55
Hyphen form: F8-99-55
MAC range: F8:99:55:00:00:00 – F8:99:55:FF:FF:FF
Addresses in block: 16,777,216
Organization: Fortress Technology Inc
Address: 51 Grand Marshall Drive Scarborough Ontario CA M1B 5N6
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 "Fortress Technology Inc"
archived source →
2026-07-17Assigned to "Fortress Technology Inc"

Nearby in the registry

The prefixes assigned immediately before and after F8:99:55:

FAQ

Which company owns MAC address prefix F8:99:55?: MAC address prefix F8:99:55 is registered to Fortress Technology Inc in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with F8:99:55 has a network interface built by Fortress Technology Inc.
What is the OUI F8:99:55?: F8:99:55 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Fortress Technology Inc. It covers every address from F8:99:55:00:00:00 to F8:99:55:FF:FF:FF, or 16,777,216 addresses in total. It is also written F8-99-55.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in F8:99:55:00:00:00 that is F8:99:55 — 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 Fortress Technology Inc located?: Fortress Technology Inc is listed at 51 Grand Marshall Drive Scarborough Ontario CA M1B 5N6 in the IEEE OUI registry entry for F8:99:55. This is the address the organization registered with the IEEE, which may differ from its current operating address.