Which company owns MAC address prefix 38:C4:E8?

MAC address prefix 38:C4:E8 is registered to NSS Sp. z o.o. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 38:C4:E8 has a network interface built by NSS Sp. z o.o..

What is the OUI 38:C4:E8?

38:C4:E8 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to NSS Sp. z o.o.. It covers every address from 38:C4:E8:00:00:00 to 38:C4:E8:FF:FF:FF, or 16,777,216 addresses in total. It is also written 38-C4-E8.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 38:C4:E8:00:00:00 that is 38:C4:E8 — 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 NSS Sp. z o.o. located?

NSS Sp. z o.o. is listed at Modularna 11 Warszawa PL 02-238 in the IEEE OUI registry entry for 38:C4:E8. This is the address the organization registered with the IEEE, which may differ from its current operating address.

NSS Sp. z o.o.

MAC address prefix 38:C4:E8 is registered to NSS Sp. z o.o. in the IEEE OUI registry. Any device whose MAC address begins with 38:C4:E8 has a network interface built by NSS 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 38:C4:E8:00:00:00 to 38:C4:E8:FF:FF:FF.

OUI prefix: 38:C4:E8
Hyphen form: 38-C4-E8
MAC range: 38:C4:E8:00:00:00 – 38:C4:E8:FF:FF:FF
Addresses in block: 16,777,216
Organization: NSS Sp. z o.o.
Address: Modularna 11 Warszawa PL 02-238
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.

2019-07-04Assigned to "NSS Sp. z o.o."
archived source →
2026-07-17Assigned to "NSS Sp. z o.o."

Nearby in the registry

The prefixes assigned immediately before and after 38:C4:E8:

FAQ

Which company owns MAC address prefix 38:C4:E8?: MAC address prefix 38:C4:E8 is registered to NSS Sp. z o.o. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 38:C4:E8 has a network interface built by NSS Sp. z o.o..
What is the OUI 38:C4:E8?: 38:C4:E8 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to NSS Sp. z o.o.. It covers every address from 38:C4:E8:00:00:00 to 38:C4:E8:FF:FF:FF, or 16,777,216 addresses in total. It is also written 38-C4-E8.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 38:C4:E8:00:00:00 that is 38:C4:E8 — 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 NSS Sp. z o.o. located?: NSS Sp. z o.o. is listed at Modularna 11 Warszawa PL 02-238 in the IEEE OUI registry entry for 38:C4:E8. This is the address the organization registered with the IEEE, which may differ from its current operating address.