Which company owns MAC address prefix 64:81:25?

MAC address prefix 64:81:25 is registered to Alphatron Marine BV in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 64:81:25 has a network interface built by Alphatron Marine BV.

What is the OUI 64:81:25?

64:81:25 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Alphatron Marine BV. It covers every address from 64:81:25:00:00:00 to 64:81:25:FF:FF:FF, or 16,777,216 addresses in total. It is also written 64-81-25.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 64:81:25:00:00:00 that is 64:81:25 — 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 Alphatron Marine BV located?

Alphatron Marine BV is listed at Schaardijk 23 Rotterdam Zuid-Holland NL 3063NH in the IEEE OUI registry entry for 64:81:25. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Alphatron Marine BV

MAC address prefix 64:81:25 is registered to Alphatron Marine BV in the IEEE OUI registry. Any device whose MAC address begins with 64:81:25 has a network interface built by Alphatron Marine BV. 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 64:81:25:00:00:00 to 64:81:25:FF:FF:FF.

OUI prefix: 64:81:25
Hyphen form: 64-81-25
MAC range: 64:81:25:00:00:00 – 64:81:25:FF:FF:FF
Addresses in block: 16,777,216
Organization: Alphatron Marine BV
Address: Schaardijk 23 Rotterdam Zuid-Holland NL 3063NH
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 "Alphatron Marine BV"
archived source →
2026-07-17Assigned to "Alphatron Marine BV"

Nearby in the registry

The prefixes assigned immediately before and after 64:81:25:

FAQ

Which company owns MAC address prefix 64:81:25?: MAC address prefix 64:81:25 is registered to Alphatron Marine BV in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 64:81:25 has a network interface built by Alphatron Marine BV.
What is the OUI 64:81:25?: 64:81:25 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Alphatron Marine BV. It covers every address from 64:81:25:00:00:00 to 64:81:25:FF:FF:FF, or 16,777,216 addresses in total. It is also written 64-81-25.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 64:81:25:00:00:00 that is 64:81:25 — 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 Alphatron Marine BV located?: Alphatron Marine BV is listed at Schaardijk 23 Rotterdam Zuid-Holland NL 3063NH in the IEEE OUI registry entry for 64:81:25. This is the address the organization registered with the IEEE, which may differ from its current operating address.