Which company owns MAC address prefix 54:A0:4F?

MAC address prefix 54:A0:4F is registered to t-mac Technologies Ltd in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 54:A0:4F has a network interface built by t-mac Technologies Ltd.

What is the OUI 54:A0:4F?

54:A0:4F is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to t-mac Technologies Ltd. It covers every address from 54:A0:4F:00:00:00 to 54:A0:4F:FF:FF:FF, or 16,777,216 addresses in total. It is also written 54-A0-4F.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 54:A0:4F:00:00:00 that is 54:A0:4F — 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 t-mac Technologies Ltd located?

t-mac Technologies Ltd is listed at Stand Park Chesterfield Derbyshire GB S41 8JT in the IEEE OUI registry entry for 54:A0:4F. This is the address the organization registered with the IEEE, which may differ from its current operating address.

t-mac Technologies Ltd

MAC address prefix 54:A0:4F is registered to t-mac Technologies Ltd in the IEEE OUI registry. Any device whose MAC address begins with 54:A0:4F has a network interface built by t-mac Technologies Ltd. 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 54:A0:4F:00:00:00 to 54:A0:4F:FF:FF:FF.

OUI prefix: 54:A0:4F
Hyphen form: 54-A0-4F
MAC range: 54:A0:4F:00:00:00 – 54:A0:4F:FF:FF:FF
Addresses in block: 16,777,216
Organization: t-mac Technologies Ltd
Address: Stand Park Chesterfield Derbyshire GB S41 8JT
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 "t-mac Technologies Ltd"
archived source →
2026-07-17Assigned to "t-mac Technologies Ltd"

Nearby in the registry

The prefixes assigned immediately before and after 54:A0:4F:

FAQ

Which company owns MAC address prefix 54:A0:4F?: MAC address prefix 54:A0:4F is registered to t-mac Technologies Ltd in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 54:A0:4F has a network interface built by t-mac Technologies Ltd.
What is the OUI 54:A0:4F?: 54:A0:4F is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to t-mac Technologies Ltd. It covers every address from 54:A0:4F:00:00:00 to 54:A0:4F:FF:FF:FF, or 16,777,216 addresses in total. It is also written 54-A0-4F.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 54:A0:4F:00:00:00 that is 54:A0:4F — 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 t-mac Technologies Ltd located?: t-mac Technologies Ltd is listed at Stand Park Chesterfield Derbyshire GB S41 8JT in the IEEE OUI registry entry for 54:A0:4F. This is the address the organization registered with the IEEE, which may differ from its current operating address.