Which company owns MAC address prefix DC:57:5C?

MAC address prefix DC:57:5C is registered to PR Electronics A/S in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with DC:57:5C has a network interface built by PR Electronics A/S.

What is the OUI DC:57:5C?

DC:57:5C is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to PR Electronics A/S. It covers every address from DC:57:5C:00:00:00 to DC:57:5C:FF:FF:FF, or 16,777,216 addresses in total. It is also written DC-57-5C.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in DC:57:5C:00:00:00 that is DC:57:5C — 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 PR Electronics A/S located?

PR Electronics A/S is listed at Lerbakken 10 Følle DK 8410 in the IEEE OUI registry entry for DC:57:5C. This is the address the organization registered with the IEEE, which may differ from its current operating address.

PR Electronics A/S

MAC address prefix DC:57:5C is registered to PR Electronics A/S in the IEEE OUI registry. Any device whose MAC address begins with DC:57:5C has a network interface built by PR Electronics A/S. 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 DC:57:5C:00:00:00 to DC:57:5C:FF:FF:FF.

OUI prefix: DC:57:5C
Hyphen form: DC-57-5C
MAC range: DC:57:5C:00:00:00 – DC:57:5C:FF:FF:FF
Addresses in block: 16,777,216
Organization: PR Electronics A/S
Address: Lerbakken 10 Følle DK 8410
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.

2026-01-08Assigned to "PR Electronics A/S"
archived source →
2026-07-17Assigned to "PR Electronics A/S"

Nearby in the registry

The prefixes assigned immediately before and after DC:57:5C:

FAQ

Which company owns MAC address prefix DC:57:5C?: MAC address prefix DC:57:5C is registered to PR Electronics A/S in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with DC:57:5C has a network interface built by PR Electronics A/S.
What is the OUI DC:57:5C?: DC:57:5C is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to PR Electronics A/S. It covers every address from DC:57:5C:00:00:00 to DC:57:5C:FF:FF:FF, or 16,777,216 addresses in total. It is also written DC-57-5C.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in DC:57:5C:00:00:00 that is DC:57:5C — 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 PR Electronics A/S located?: PR Electronics A/S is listed at Lerbakken 10 Følle DK 8410 in the IEEE OUI registry entry for DC:57:5C. This is the address the organization registered with the IEEE, which may differ from its current operating address.