Which company owns MAC address prefix F8:8D:EF?

MAC address prefix F8:8D:EF is registered to Tenebraex in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with F8:8D:EF has a network interface built by Tenebraex.

What is the OUI F8:8D:EF?

F8:8D:EF is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Tenebraex. It covers every address from F8:8D:EF:00:00:00 to F8:8D:EF:FF:FF:FF, or 16,777,216 addresses in total. It is also written F8-8D-EF.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in F8:8D:EF:00:00:00 that is F8:8D: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 Tenebraex located?

Tenebraex is listed at 27 Drydock Avenue Boston MA US 02210 in the IEEE OUI registry entry for F8:8D:EF. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Tenebraex

MAC address prefix F8:8D:EF is registered to Tenebraex in the IEEE OUI registry. Any device whose MAC address begins with F8:8D:EF has a network interface built by Tenebraex. 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 F8:8D:EF:00:00:00 to F8:8D:EF:FF:FF:FF.

OUI prefix: F8:8D:EF
Hyphen form: F8-8D-EF
MAC range: F8:8D:EF:00:00:00 – F8:8D:EF:FF:FF:FF
Addresses in block: 16,777,216
Organization: Tenebraex
Address: 27 Drydock Avenue Boston MA US 02210
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 "Tenebraex"
archived source →
2026-07-17Assigned to "Tenebraex"

Nearby in the registry

The prefixes assigned immediately before and after F8:8D:EF:

FAQ

Which company owns MAC address prefix F8:8D:EF?: MAC address prefix F8:8D:EF is registered to Tenebraex in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with F8:8D:EF has a network interface built by Tenebraex.
What is the OUI F8:8D:EF?: F8:8D:EF is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Tenebraex. It covers every address from F8:8D:EF:00:00:00 to F8:8D:EF:FF:FF:FF, or 16,777,216 addresses in total. It is also written F8-8D-EF.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in F8:8D:EF:00:00:00 that is F8:8D: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 Tenebraex located?: Tenebraex is listed at 27 Drydock Avenue Boston MA US 02210 in the IEEE OUI registry entry for F8:8D:EF. This is the address the organization registered with the IEEE, which may differ from its current operating address.