Which company owns MAC address prefix DC:9F:1F?

MAC address prefix DC:9F:1F is registered to Aseko, spol. s r.o. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with DC:9F:1F has a network interface built by Aseko, spol. s r.o..

What is the OUI DC:9F:1F?

DC:9F:1F is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Aseko, spol. s r.o.. It covers every address from DC:9F:1F:00:00:00 to DC:9F:1F:FF:FF:FF, or 16,777,216 addresses in total. It is also written DC-9F-1F.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in DC:9F:1F:00:00:00 that is DC:9F:1F — 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 Aseko, spol. s r.o. located?

Aseko, spol. s r.o. is listed at Videnska 340 Vestec u Prahy CZ 25250 in the IEEE OUI registry entry for DC:9F:1F. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Aseko, spol. s r.o.

MAC address prefix DC:9F:1F is registered to Aseko, spol. s r.o. in the IEEE OUI registry. Any device whose MAC address begins with DC:9F:1F has a network interface built by Aseko, spol. s r.o.. 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:9F:1F:00:00:00 to DC:9F:1F:FF:FF:FF.

OUI prefix: DC:9F:1F
Hyphen form: DC-9F-1F
MAC range: DC:9F:1F:00:00:00 – DC:9F:1F:FF:FF:FF
Addresses in block: 16,777,216
Organization: Aseko, spol. s r.o.
Address: Videnska 340 Vestec u Prahy CZ 25250
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 (1)

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

2026-08-21Assigned to "Aseko, spol. s r.o."

Nearby in the registry

The prefixes assigned immediately before and after DC:9F:1F:

FAQ

Which company owns MAC address prefix DC:9F:1F?: MAC address prefix DC:9F:1F is registered to Aseko, spol. s r.o. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with DC:9F:1F has a network interface built by Aseko, spol. s r.o..
What is the OUI DC:9F:1F?: DC:9F:1F is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Aseko, spol. s r.o.. It covers every address from DC:9F:1F:00:00:00 to DC:9F:1F:FF:FF:FF, or 16,777,216 addresses in total. It is also written DC-9F-1F.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in DC:9F:1F:00:00:00 that is DC:9F:1F — 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 Aseko, spol. s r.o. located?: Aseko, spol. s r.o. is listed at Videnska 340 Vestec u Prahy CZ 25250 in the IEEE OUI registry entry for DC:9F:1F. This is the address the organization registered with the IEEE, which may differ from its current operating address.