Which company owns MAC address prefix 14:A9:E3?

MAC address prefix 14:A9:E3 is registered to MST CORPORATION in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 14:A9:E3 has a network interface built by MST CORPORATION.

What is the OUI 14:A9:E3?

14:A9:E3 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to MST CORPORATION. It covers every address from 14:A9:E3:00:00:00 to 14:A9:E3:FF:FF:FF, or 16,777,216 addresses in total. It is also written 14-A9-E3.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 14:A9:E3:00:00:00 that is 14:A9:E3 — 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 MST CORPORATION located?

MST CORPORATION is listed at 4th Floor Lawford House London England GB N3 1 RL in the IEEE OUI registry entry for 14:A9:E3. This is the address the organization registered with the IEEE, which may differ from its current operating address.

MST CORPORATION

MAC address prefix 14:A9:E3 is registered to MST CORPORATION in the IEEE OUI registry. Any device whose MAC address begins with 14:A9:E3 has a network interface built by MST CORPORATION. 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 14:A9:E3:00:00:00 to 14:A9:E3:FF:FF:FF.

OUI prefix: 14:A9:E3
Hyphen form: 14-A9-E3
MAC range: 14:A9:E3:00:00:00 – 14:A9:E3:FF:FF:FF
Addresses in block: 16,777,216
Organization: MST CORPORATION
Address: 4th Floor Lawford House London England GB N3 1 RL
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 "MST CORPORATION"
archived source →
2026-07-17Assigned to "MST CORPORATION"

Nearby in the registry

The prefixes assigned immediately before and after 14:A9:E3:

FAQ

Which company owns MAC address prefix 14:A9:E3?: MAC address prefix 14:A9:E3 is registered to MST CORPORATION in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 14:A9:E3 has a network interface built by MST CORPORATION.
What is the OUI 14:A9:E3?: 14:A9:E3 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to MST CORPORATION. It covers every address from 14:A9:E3:00:00:00 to 14:A9:E3:FF:FF:FF, or 16,777,216 addresses in total. It is also written 14-A9-E3.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 14:A9:E3:00:00:00 that is 14:A9:E3 — 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 MST CORPORATION located?: MST CORPORATION is listed at 4th Floor Lawford House London England GB N3 1 RL in the IEEE OUI registry entry for 14:A9:E3. This is the address the organization registered with the IEEE, which may differ from its current operating address.