Which company owns MAC address prefix A8:3C:CB?

MAC address prefix A8:3C:CB is registered to ROSSMA in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with A8:3C:CB has a network interface built by ROSSMA.

What is the OUI A8:3C:CB?

A8:3C:CB is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to ROSSMA. It covers every address from A8:3C:CB:00:00:00 to A8:3C:CB:FF:FF:FF, or 16,777,216 addresses in total. It is also written A8-3C-CB.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in A8:3C:CB:00:00:00 that is A8:3C:CB — 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 ROSSMA located?

ROSSMA is listed at Malkova,12-108 PERM RU 614087 in the IEEE OUI registry entry for A8:3C:CB. This is the address the organization registered with the IEEE, which may differ from its current operating address.

ROSSMA

MAC address prefix A8:3C:CB is registered to ROSSMA in the IEEE OUI registry. Any device whose MAC address begins with A8:3C:CB has a network interface built by ROSSMA. 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 A8:3C:CB:00:00:00 to A8:3C:CB:FF:FF:FF.

OUI prefix: A8:3C:CB
Hyphen form: A8-3C-CB
MAC range: A8:3C:CB:00:00:00 – A8:3C:CB:FF:FF:FF
Addresses in block: 16,777,216
Organization: ROSSMA
Address: Malkova,12-108 PERM RU 614087
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.

2018-12-21Assigned to "ROSSMA"
archived source →
2026-07-17Assigned to "ROSSMA"

Nearby in the registry

The prefixes assigned immediately before and after A8:3C:CB:

FAQ

Which company owns MAC address prefix A8:3C:CB?: MAC address prefix A8:3C:CB is registered to ROSSMA in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with A8:3C:CB has a network interface built by ROSSMA.
What is the OUI A8:3C:CB?: A8:3C:CB is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to ROSSMA. It covers every address from A8:3C:CB:00:00:00 to A8:3C:CB:FF:FF:FF, or 16,777,216 addresses in total. It is also written A8-3C-CB.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in A8:3C:CB:00:00:00 that is A8:3C:CB — 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 ROSSMA located?: ROSSMA is listed at Malkova,12-108 PERM RU 614087 in the IEEE OUI registry entry for A8:3C:CB. This is the address the organization registered with the IEEE, which may differ from its current operating address.