Which company owns MAC address prefix DC:82:5B?

MAC address prefix DC:82:5B is registered to JANUS, spol. s r.o. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with DC:82:5B has a network interface built by JANUS, spol. s r.o..

What is the OUI DC:82:5B?

DC:82:5B is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to JANUS, spol. s r.o.. It covers every address from DC:82:5B:00:00:00 to DC:82:5B:FF:FF:FF, or 16,777,216 addresses in total. It is also written DC-82-5B.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in DC:82:5B:00:00:00 that is DC:82:5B — 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 JANUS, spol. s r.o. located?

JANUS, spol. s r.o. is listed at Sarajevska 8 Prague Czech Republic CZ 12000 in the IEEE OUI registry entry for DC:82:5B. This is the address the organization registered with the IEEE, which may differ from its current operating address.

JANUS, spol. s r.o.

MAC address prefix DC:82:5B is registered to JANUS, spol. s r.o. in the IEEE OUI registry. Any device whose MAC address begins with DC:82:5B has a network interface built by JANUS, 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:82:5B:00:00:00 to DC:82:5B:FF:FF:FF.

OUI prefix: DC:82:5B
Hyphen form: DC-82-5B
MAC range: DC:82:5B:00:00:00 – DC:82:5B:FF:FF:FF
Addresses in block: 16,777,216
Organization: JANUS, spol. s r.o.
Address: Sarajevska 8 Prague Czech Republic CZ 12000
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 "JANUS, spol. s r.o."
archived source →
2026-07-17Assigned to "JANUS, spol. s r.o."

Nearby in the registry

The prefixes assigned immediately before and after DC:82:5B:

FAQ

Which company owns MAC address prefix DC:82:5B?: MAC address prefix DC:82:5B is registered to JANUS, spol. s r.o. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with DC:82:5B has a network interface built by JANUS, spol. s r.o..
What is the OUI DC:82:5B?: DC:82:5B is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to JANUS, spol. s r.o.. It covers every address from DC:82:5B:00:00:00 to DC:82:5B:FF:FF:FF, or 16,777,216 addresses in total. It is also written DC-82-5B.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in DC:82:5B:00:00:00 that is DC:82:5B — 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 JANUS, spol. s r.o. located?: JANUS, spol. s r.o. is listed at Sarajevska 8 Prague Czech Republic CZ 12000 in the IEEE OUI registry entry for DC:82:5B. This is the address the organization registered with the IEEE, which may differ from its current operating address.