Which company owns MAC address prefix 98:1D:AC?

MAC address prefix 98:1D:AC is registered to Cyviz AS in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 98:1D:AC has a network interface built by Cyviz AS.

What is the OUI 98:1D:AC?

98:1D:AC is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Cyviz AS. It covers every address from 98:1D:AC:00:00:00 to 98:1D:AC:FF:FF:FF, or 16,777,216 addresses in total. It is also written 98-1D-AC.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 98:1D:AC:00:00:00 that is 98:1D:AC — 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 Cyviz AS located?

Cyviz AS is listed at Grenseveien 21 Sandnes NO 4313 in the IEEE OUI registry entry for 98:1D:AC. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Cyviz AS

MAC address prefix 98:1D:AC is registered to Cyviz AS in the IEEE OUI registry. Any device whose MAC address begins with 98:1D:AC has a network interface built by Cyviz AS. 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 98:1D:AC:00:00:00 to 98:1D:AC:FF:FF:FF.

OUI prefix: 98:1D:AC
Hyphen form: 98-1D-AC
MAC range: 98:1D:AC:00:00:00 – 98:1D:AC:FF:FF:FF
Addresses in block: 16,777,216
Organization: Cyviz AS
Address: Grenseveien 21 Sandnes NO 4313
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.

2024-04-16Assigned to "Cyviz AS"
archived source →
2026-07-17Assigned to "Cyviz AS"

Nearby in the registry

The prefixes assigned immediately before and after 98:1D:AC:

FAQ

Which company owns MAC address prefix 98:1D:AC?: MAC address prefix 98:1D:AC is registered to Cyviz AS in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 98:1D:AC has a network interface built by Cyviz AS.
What is the OUI 98:1D:AC?: 98:1D:AC is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Cyviz AS. It covers every address from 98:1D:AC:00:00:00 to 98:1D:AC:FF:FF:FF, or 16,777,216 addresses in total. It is also written 98-1D-AC.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 98:1D:AC:00:00:00 that is 98:1D:AC — 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 Cyviz AS located?: Cyviz AS is listed at Grenseveien 21 Sandnes NO 4313 in the IEEE OUI registry entry for 98:1D:AC. This is the address the organization registered with the IEEE, which may differ from its current operating address.