Which company owns MAC address prefix 84:A9:EA?

MAC address prefix 84:A9:EA is registered to Career Technologies USA in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 84:A9:EA has a network interface built by Career Technologies USA.

What is the OUI 84:A9:EA?

84:A9:EA is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Career Technologies USA. It covers every address from 84:A9:EA:00:00:00 to 84:A9:EA:FF:FF:FF, or 16,777,216 addresses in total. It is also written 84-A9-EA.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 84:A9:EA:00:00:00 that is 84:A9:EA — 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 Career Technologies USA located?

Career Technologies USA is listed at 9134 Independence Ave Chatsworth CA US 91311 in the IEEE OUI registry entry for 84:A9:EA. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Career Technologies USA

MAC address prefix 84:A9:EA is registered to Career Technologies USA in the IEEE OUI registry. Any device whose MAC address begins with 84:A9:EA has a network interface built by Career Technologies USA. 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 84:A9:EA:00:00:00 to 84:A9:EA:FF:FF:FF.

OUI prefix: 84:A9:EA
Hyphen form: 84-A9-EA
MAC range: 84:A9:EA:00:00:00 – 84:A9:EA:FF:FF:FF
Addresses in block: 16,777,216
Organization: Career Technologies USA
Address: 9134 Independence Ave Chatsworth CA US 91311
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.

2019-07-04Assigned to "Career Technologies USA"
archived source →
2026-07-17Assigned to "Career Technologies USA"

Nearby in the registry

The prefixes assigned immediately before and after 84:A9:EA:

FAQ

Which company owns MAC address prefix 84:A9:EA?: MAC address prefix 84:A9:EA is registered to Career Technologies USA in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 84:A9:EA has a network interface built by Career Technologies USA.
What is the OUI 84:A9:EA?: 84:A9:EA is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Career Technologies USA. It covers every address from 84:A9:EA:00:00:00 to 84:A9:EA:FF:FF:FF, or 16,777,216 addresses in total. It is also written 84-A9-EA.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 84:A9:EA:00:00:00 that is 84:A9:EA — 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 Career Technologies USA located?: Career Technologies USA is listed at 9134 Independence Ave Chatsworth CA US 91311 in the IEEE OUI registry entry for 84:A9:EA. This is the address the organization registered with the IEEE, which may differ from its current operating address.