Which company owns MAC address prefix 14:A9:D0?

MAC address prefix 14:A9:D0 is registered to F5 Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 14:A9:D0 has a network interface built by F5 Inc..

What is the OUI 14:A9:D0?

14:A9:D0 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to F5 Inc.. It covers every address from 14:A9:D0:00:00:00 to 14:A9:D0:FF:FF:FF, or 16,777,216 addresses in total. It is also written 14-A9-D0.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 14:A9:D0:00:00:00 that is 14:A9:D0 — 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 F5 Inc. located?

F5 Inc. is listed at 801 5th Avenue Seattle WA US 98104 in the IEEE OUI registry entry for 14:A9:D0. This is the address the organization registered with the IEEE, which may differ from its current operating address.

How many MAC prefixes does F5 Inc. own?

F5 Inc. holds 7 OUI prefixes in the IEEE registry, of which 14:A9:D0 is one. A device made by F5 Inc. could carry a MAC address from any of them.

F5 Inc.

MAC address prefix 14:A9:D0 is registered to F5 Inc. in the IEEE OUI registry. Any device whose MAC address begins with 14:A9:D0 has a network interface built by F5 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 14:A9:D0:00:00:00 to 14:A9:D0:FF:FF:FF.

OUI prefix: 14:A9:D0
Hyphen form: 14-A9-D0
MAC range: 14:A9:D0:00:00:00 – 14:A9:D0:FF:FF:FF
Addresses in block: 16,777,216
Organization: F5 Inc.
Address: 801 5th Avenue Seattle WA US 98104
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.

Other prefixes from F5 Inc.

F5 Inc. holds 7 OUI prefixes in total. A device with this exact prefix could just as well carry any of these:

Assignment history (3)

The IEEE registry publishes current state only — this is the change record we've kept since we started tracking it daily.

2020-08-05Assigned to "F5 Networks, Inc."
archived source →
2025-08-23Renamed from "F5 Networks, Inc." to "F5 Inc."
archived source →
2026-07-17Assigned to "F5 Inc."

Nearby in the registry

The prefixes assigned immediately before and after 14:A9:D0:

FAQ

Which company owns MAC address prefix 14:A9:D0?: MAC address prefix 14:A9:D0 is registered to F5 Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 14:A9:D0 has a network interface built by F5 Inc..
What is the OUI 14:A9:D0?: 14:A9:D0 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to F5 Inc.. It covers every address from 14:A9:D0:00:00:00 to 14:A9:D0:FF:FF:FF, or 16,777,216 addresses in total. It is also written 14-A9-D0.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 14:A9:D0:00:00:00 that is 14:A9:D0 — 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 F5 Inc. located?: F5 Inc. is listed at 801 5th Avenue Seattle WA US 98104 in the IEEE OUI registry entry for 14:A9:D0. This is the address the organization registered with the IEEE, which may differ from its current operating address.
How many MAC prefixes does F5 Inc. own?: F5 Inc. holds 7 OUI prefixes in the IEEE registry, of which 14:A9:D0 is one. A device made by F5 Inc. could carry a MAC address from any of them.