Which company owns MAC address prefix B8:1F:5E?

MAC address prefix B8:1F:5E is registered to Apption Labs Limited in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with B8:1F:5E has a network interface built by Apption Labs Limited.

What is the OUI B8:1F:5E?

B8:1F:5E is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Apption Labs Limited. It covers every address from B8:1F:5E:00:00:00 to B8:1F:5E:FF:FF:FF, or 16,777,216 addresses in total. It is also written B8-1F-5E.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in B8:1F:5E:00:00:00 that is B8:1F:5E — 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 Apption Labs Limited located?

Apption Labs Limited is listed at 7-8 Westbridge Close Leicester GB LE3 5LW in the IEEE OUI registry entry for B8:1F:5E. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Apption Labs Limited

MAC address prefix B8:1F:5E is registered to Apption Labs Limited in the IEEE OUI registry. Any device whose MAC address begins with B8:1F:5E has a network interface built by Apption Labs Limited. 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 B8:1F:5E:00:00:00 to B8:1F:5E:FF:FF:FF.

OUI prefix: B8:1F:5E
Hyphen form: B8-1F-5E
MAC range: B8:1F:5E:00:00:00 – B8:1F:5E:FF:FF:FF
Addresses in block: 16,777,216
Organization: Apption Labs Limited
Address: 7-8 Westbridge Close Leicester GB LE3 5LW
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 "Apption Labs Limited"
archived source →
2026-07-17Assigned to "Apption Labs Limited"

Nearby in the registry

The prefixes assigned immediately before and after B8:1F:5E:

FAQ

Which company owns MAC address prefix B8:1F:5E?: MAC address prefix B8:1F:5E is registered to Apption Labs Limited in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with B8:1F:5E has a network interface built by Apption Labs Limited.
What is the OUI B8:1F:5E?: B8:1F:5E is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Apption Labs Limited. It covers every address from B8:1F:5E:00:00:00 to B8:1F:5E:FF:FF:FF, or 16,777,216 addresses in total. It is also written B8-1F-5E.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in B8:1F:5E:00:00:00 that is B8:1F:5E — 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 Apption Labs Limited located?: Apption Labs Limited is listed at 7-8 Westbridge Close Leicester GB LE3 5LW in the IEEE OUI registry entry for B8:1F:5E. This is the address the organization registered with the IEEE, which may differ from its current operating address.