Which company owns MAC address prefix 50:B1:40?

MAC address prefix 50:B1:40 is registered to ELPROMA ELEKTRONIKA SP Z O O in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 50:B1:40 has a network interface built by ELPROMA ELEKTRONIKA SP Z O O.

What is the OUI 50:B1:40?

50:B1:40 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to ELPROMA ELEKTRONIKA SP Z O O. It covers every address from 50:B1:40:00:00:00 to 50:B1:40:FF:FF:FF, or 16,777,216 addresses in total. It is also written 50-B1-40.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 50:B1:40:00:00:00 that is 50:B1:40 — 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 ELPROMA ELEKTRONIKA SP Z O O located?

ELPROMA ELEKTRONIKA SP Z O O is listed at DUNSKA 2A CZOSNOW PL 05152 in the IEEE OUI registry entry for 50:B1:40. This is the address the organization registered with the IEEE, which may differ from its current operating address.

ELPROMA ELEKTRONIKA SP Z O O

MAC address prefix 50:B1:40 is registered to ELPROMA ELEKTRONIKA SP Z O O in the IEEE OUI registry. Any device whose MAC address begins with 50:B1:40 has a network interface built by ELPROMA ELEKTRONIKA SP Z O 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 50:B1:40:00:00:00 to 50:B1:40:FF:FF:FF.

OUI prefix: 50:B1:40
Hyphen form: 50-B1-40
MAC range: 50:B1:40:00:00:00 – 50:B1:40:FF:FF:FF
Addresses in block: 16,777,216
Organization: ELPROMA ELEKTRONIKA SP Z O O
Address: DUNSKA 2A CZOSNOW PL 05152
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.

2024-04-16Assigned to "ELPROMA ELEKTRONIKA SP Z O O"
archived source →
2026-07-17Assigned to "ELPROMA ELEKTRONIKA SP Z O O"

Nearby in the registry

The prefixes assigned immediately before and after 50:B1:40:

FAQ

Which company owns MAC address prefix 50:B1:40?: MAC address prefix 50:B1:40 is registered to ELPROMA ELEKTRONIKA SP Z O O in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 50:B1:40 has a network interface built by ELPROMA ELEKTRONIKA SP Z O O.
What is the OUI 50:B1:40?: 50:B1:40 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to ELPROMA ELEKTRONIKA SP Z O O. It covers every address from 50:B1:40:00:00:00 to 50:B1:40:FF:FF:FF, or 16,777,216 addresses in total. It is also written 50-B1-40.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 50:B1:40:00:00:00 that is 50:B1:40 — 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 ELPROMA ELEKTRONIKA SP Z O O located?: ELPROMA ELEKTRONIKA SP Z O O is listed at DUNSKA 2A CZOSNOW PL 05152 in the IEEE OUI registry entry for 50:B1:40. This is the address the organization registered with the IEEE, which may differ from its current operating address.