Which company owns MAC address prefix A8:17:58?

MAC address prefix A8:17:58 is registered to Elektronik System i Umeå AB in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with A8:17:58 has a network interface built by Elektronik System i Umeå AB.

What is the OUI A8:17:58?

A8:17:58 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Elektronik System i Umeå AB. It covers every address from A8:17:58:00:00:00 to A8:17:58:FF:FF:FF, or 16,777,216 addresses in total. It is also written A8-17-58.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in A8:17:58:00:00:00 that is A8:17:58 — 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 Elektronik System i Umeå AB located?

Elektronik System i Umeå AB is listed at Box 7978 Umeå Västerbotten SE 907 19 in the IEEE OUI registry entry for A8:17:58. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Elektronik System i Umeå AB

MAC address prefix A8:17:58 is registered to Elektronik System i Umeå AB in the IEEE OUI registry. Any device whose MAC address begins with A8:17:58 has a network interface built by Elektronik System i Umeå AB. 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 A8:17:58:00:00:00 to A8:17:58:FF:FF:FF.

OUI prefix: A8:17:58
Hyphen form: A8-17-58
MAC range: A8:17:58:00:00:00 – A8:17:58:FF:FF:FF
Addresses in block: 16,777,216
Organization: Elektronik System i Umeå AB
Address: Box 7978 Umeå Västerbotten SE 907 19
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 "Elektronik System i Umeå AB"
archived source →
2026-07-17Assigned to "Elektronik System i Umeå AB"

Nearby in the registry

The prefixes assigned immediately before and after A8:17:58:

FAQ

Which company owns MAC address prefix A8:17:58?: MAC address prefix A8:17:58 is registered to Elektronik System i Umeå AB in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with A8:17:58 has a network interface built by Elektronik System i Umeå AB.
What is the OUI A8:17:58?: A8:17:58 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Elektronik System i Umeå AB. It covers every address from A8:17:58:00:00:00 to A8:17:58:FF:FF:FF, or 16,777,216 addresses in total. It is also written A8-17-58.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in A8:17:58:00:00:00 that is A8:17:58 — 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 Elektronik System i Umeå AB located?: Elektronik System i Umeå AB is listed at Box 7978 Umeå Västerbotten SE 907 19 in the IEEE OUI registry entry for A8:17:58. This is the address the organization registered with the IEEE, which may differ from its current operating address.