Which company owns MAC address prefix 40:15:97?

MAC address prefix 40:15:97 is registered to Protect America, Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 40:15:97 has a network interface built by Protect America, Inc..

What is the OUI 40:15:97?

40:15:97 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Protect America, Inc.. It covers every address from 40:15:97:00:00:00 to 40:15:97:FF:FF:FF, or 16,777,216 addresses in total. It is also written 40-15-97.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 40:15:97:00:00:00 that is 40:15:97 — 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 Protect America, Inc. located?

Protect America, Inc. is listed at 5100 N IH-35 Round Rock TX US 78681 in the IEEE OUI registry entry for 40:15:97. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Protect America, Inc.

MAC address prefix 40:15:97 is registered to Protect America, Inc. in the IEEE OUI registry. Any device whose MAC address begins with 40:15:97 has a network interface built by Protect America, 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 40:15:97:00:00:00 to 40:15:97:FF:FF:FF.

OUI prefix: 40:15:97
Hyphen form: 40-15-97
MAC range: 40:15:97:00:00:00 – 40:15:97:FF:FF:FF
Addresses in block: 16,777,216
Organization: Protect America, Inc.
Address: 5100 N IH-35 Round Rock TX US 78681
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 "Protect America, Inc."
archived source →
2026-07-17Assigned to "Protect America, Inc."

Nearby in the registry

The prefixes assigned immediately before and after 40:15:97:

FAQ

Which company owns MAC address prefix 40:15:97?: MAC address prefix 40:15:97 is registered to Protect America, Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 40:15:97 has a network interface built by Protect America, Inc..
What is the OUI 40:15:97?: 40:15:97 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Protect America, Inc.. It covers every address from 40:15:97:00:00:00 to 40:15:97:FF:FF:FF, or 16,777,216 addresses in total. It is also written 40-15-97.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 40:15:97:00:00:00 that is 40:15:97 — 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 Protect America, Inc. located?: Protect America, Inc. is listed at 5100 N IH-35 Round Rock TX US 78681 in the IEEE OUI registry entry for 40:15:97. This is the address the organization registered with the IEEE, which may differ from its current operating address.