Which company owns MAC address prefix 58:1F:EF?

MAC address prefix 58:1F:EF is registered to Tuttnaer LTD in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 58:1F:EF has a network interface built by Tuttnaer LTD.

What is the OUI 58:1F:EF?

58:1F:EF is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Tuttnaer LTD. It covers every address from 58:1F:EF:00:00:00 to 58:1F:EF:FF:FF:FF, or 16,777,216 addresses in total. It is also written 58-1F-EF.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 58:1F:EF:00:00:00 that is 58:1F:EF — 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 Tuttnaer LTD located?

Tuttnaer LTD is listed at Har-Tuv B Beith Shemesh IL 99000 in the IEEE OUI registry entry for 58:1F:EF. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Tuttnaer LTD

MAC address prefix 58:1F:EF is registered to Tuttnaer LTD in the IEEE OUI registry. Any device whose MAC address begins with 58:1F:EF has a network interface built by Tuttnaer LTD. 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 58:1F:EF:00:00:00 to 58:1F:EF:FF:FF:FF.

OUI prefix: 58:1F:EF
Hyphen form: 58-1F-EF
MAC range: 58:1F:EF:00:00:00 – 58:1F:EF:FF:FF:FF
Addresses in block: 16,777,216
Organization: Tuttnaer LTD
Address: Har-Tuv B Beith Shemesh IL 99000
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 "Tuttnaer LTD"
archived source →
2026-07-17Assigned to "Tuttnaer LTD"

Nearby in the registry

The prefixes assigned immediately before and after 58:1F:EF:

FAQ

Which company owns MAC address prefix 58:1F:EF?: MAC address prefix 58:1F:EF is registered to Tuttnaer LTD in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 58:1F:EF has a network interface built by Tuttnaer LTD.
What is the OUI 58:1F:EF?: 58:1F:EF is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Tuttnaer LTD. It covers every address from 58:1F:EF:00:00:00 to 58:1F:EF:FF:FF:FF, or 16,777,216 addresses in total. It is also written 58-1F-EF.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 58:1F:EF:00:00:00 that is 58:1F:EF — 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 Tuttnaer LTD located?: Tuttnaer LTD is listed at Har-Tuv B Beith Shemesh IL 99000 in the IEEE OUI registry entry for 58:1F:EF. This is the address the organization registered with the IEEE, which may differ from its current operating address.