Which company owns MAC address prefix 10:83:B4?

MAC address prefix 10:83:B4 is registered to Sidora Srl in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 10:83:B4 has a network interface built by Sidora Srl.

What is the OUI 10:83:B4?

10:83:B4 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Sidora Srl. It covers every address from 10:83:B4:00:00:00 to 10:83:B4:FF:FF:FF, or 16,777,216 addresses in total. It is also written 10-83-B4.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 10:83:B4:00:00:00 that is 10:83:B4 — 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 Sidora Srl located?

Sidora Srl is listed at Via Giacomo Boni, 15 Roma Rm IT 00162 in the IEEE OUI registry entry for 10:83:B4. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Sidora Srl

MAC address prefix 10:83:B4 is registered to Sidora Srl in the IEEE OUI registry. Any device whose MAC address begins with 10:83:B4 has a network interface built by Sidora 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 10:83:B4:00:00:00 to 10:83:B4:FF:FF:FF.

OUI prefix: 10:83:B4
Hyphen form: 10-83-B4
MAC range: 10:83:B4:00:00:00 – 10:83:B4:FF:FF:FF
Addresses in block: 16,777,216
Organization: Sidora Srl
Address: Via Giacomo Boni, 15 Roma Rm IT 00162
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.

2024-02-15Assigned to "Sidora Srl"
archived source →
2026-07-17Assigned to "Sidora Srl"

Nearby in the registry

The prefixes assigned immediately before and after 10:83:B4:

FAQ

Which company owns MAC address prefix 10:83:B4?: MAC address prefix 10:83:B4 is registered to Sidora Srl in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 10:83:B4 has a network interface built by Sidora Srl.
What is the OUI 10:83:B4?: 10:83:B4 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Sidora Srl. It covers every address from 10:83:B4:00:00:00 to 10:83:B4:FF:FF:FF, or 16,777,216 addresses in total. It is also written 10-83-B4.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 10:83:B4:00:00:00 that is 10:83:B4 — 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 Sidora Srl located?: Sidora Srl is listed at Via Giacomo Boni, 15 Roma Rm IT 00162 in the IEEE OUI registry entry for 10:83:B4. This is the address the organization registered with the IEEE, which may differ from its current operating address.