Which company owns MAC address prefix A4:B3:6A?

MAC address prefix A4:B3:6A is registered to JSC SDO Chromatec in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with A4:B3:6A has a network interface built by JSC SDO Chromatec.

What is the OUI A4:B3:6A?

A4:B3:6A is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to JSC SDO Chromatec. It covers every address from A4:B3:6A:00:00:00 to A4:B3:6A:FF:FF:FF, or 16,777,216 addresses in total. It is also written A4-B3-6A.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in A4:B3:6A:00:00:00 that is A4:B3:6A — 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 JSC SDO Chromatec located?

JSC SDO Chromatec is listed at 94, Stroiteley street Yoshkar-Ola Mari El republic RU 424000 in the IEEE OUI registry entry for A4:B3:6A. This is the address the organization registered with the IEEE, which may differ from its current operating address.

JSC SDO Chromatec

MAC address prefix A4:B3:6A is registered to JSC SDO Chromatec in the IEEE OUI registry. Any device whose MAC address begins with A4:B3:6A has a network interface built by JSC SDO Chromatec. 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 A4:B3:6A:00:00:00 to A4:B3:6A:FF:FF:FF.

OUI prefix: A4:B3:6A
Hyphen form: A4-B3-6A
MAC range: A4:B3:6A:00:00:00 – A4:B3:6A:FF:FF:FF
Addresses in block: 16,777,216
Organization: JSC SDO Chromatec
Address: 94, Stroiteley street Yoshkar-Ola Mari El republic RU 424000
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 "JSC SDO Chromatec"
archived source →
2026-07-17Assigned to "JSC SDO Chromatec"

Nearby in the registry

The prefixes assigned immediately before and after A4:B3:6A:

FAQ

Which company owns MAC address prefix A4:B3:6A?: MAC address prefix A4:B3:6A is registered to JSC SDO Chromatec in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with A4:B3:6A has a network interface built by JSC SDO Chromatec.
What is the OUI A4:B3:6A?: A4:B3:6A is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to JSC SDO Chromatec. It covers every address from A4:B3:6A:00:00:00 to A4:B3:6A:FF:FF:FF, or 16,777,216 addresses in total. It is also written A4-B3-6A.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in A4:B3:6A:00:00:00 that is A4:B3:6A — 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 JSC SDO Chromatec located?: JSC SDO Chromatec is listed at 94, Stroiteley street Yoshkar-Ola Mari El republic RU 424000 in the IEEE OUI registry entry for A4:B3:6A. This is the address the organization registered with the IEEE, which may differ from its current operating address.