Which company owns MAC address prefix 34:A5:5D?

MAC address prefix 34:A5:5D is registered to TECHNOSOFT INTERNATIONAL SRL in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 34:A5:5D has a network interface built by TECHNOSOFT INTERNATIONAL SRL.

What is the OUI 34:A5:5D?

34:A5:5D is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to TECHNOSOFT INTERNATIONAL SRL. It covers every address from 34:A5:5D:00:00:00 to 34:A5:5D:FF:FF:FF, or 16,777,216 addresses in total. It is also written 34-A5-5D.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 34:A5:5D:00:00:00 that is 34:A5:5D — 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 TECHNOSOFT INTERNATIONAL SRL located?

TECHNOSOFT INTERNATIONAL SRL is listed at RO6640904 Bucuresti - Sector 6 RO 061992 in the IEEE OUI registry entry for 34:A5:5D. This is the address the organization registered with the IEEE, which may differ from its current operating address.

TECHNOSOFT INTERNATIONAL SRL

MAC address prefix 34:A5:5D is registered to TECHNOSOFT INTERNATIONAL SRL in the IEEE OUI registry. Any device whose MAC address begins with 34:A5:5D has a network interface built by TECHNOSOFT INTERNATIONAL SRL. 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 34:A5:5D:00:00:00 to 34:A5:5D:FF:FF:FF.

OUI prefix: 34:A5:5D
Hyphen form: 34-A5-5D
MAC range: 34:A5:5D:00:00:00 – 34:A5:5D:FF:FF:FF
Addresses in block: 16,777,216
Organization: TECHNOSOFT INTERNATIONAL SRL
Address: RO6640904 Bucuresti - Sector 6 RO 061992
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 "TECHNOSOFT INTERNATIONAL SRL"
archived source →
2026-07-17Assigned to "TECHNOSOFT INTERNATIONAL SRL"

Nearby in the registry

The prefixes assigned immediately before and after 34:A5:5D:

FAQ

Which company owns MAC address prefix 34:A5:5D?: MAC address prefix 34:A5:5D is registered to TECHNOSOFT INTERNATIONAL SRL in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 34:A5:5D has a network interface built by TECHNOSOFT INTERNATIONAL SRL.
What is the OUI 34:A5:5D?: 34:A5:5D is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to TECHNOSOFT INTERNATIONAL SRL. It covers every address from 34:A5:5D:00:00:00 to 34:A5:5D:FF:FF:FF, or 16,777,216 addresses in total. It is also written 34-A5-5D.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 34:A5:5D:00:00:00 that is 34:A5:5D — 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 TECHNOSOFT INTERNATIONAL SRL located?: TECHNOSOFT INTERNATIONAL SRL is listed at RO6640904 Bucuresti - Sector 6 RO 061992 in the IEEE OUI registry entry for 34:A5:5D. This is the address the organization registered with the IEEE, which may differ from its current operating address.