Which company owns MAC address prefix 08:00:3F?

MAC address prefix 08:00:3F is registered to FRED KOSCHARA ENTERPRISES in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 08:00:3F has a network interface built by FRED KOSCHARA ENTERPRISES.

What is the OUI 08:00:3F?

08:00:3F is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to FRED KOSCHARA ENTERPRISES. It covers every address from 08:00:3F:00:00:00 to 08:00:3F:FF:FF:FF, or 16,777,216 addresses in total. It is also written 08-00-3F.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 08:00:3F:00:00:00 that is 08:00:3F — 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.

FRED KOSCHARA ENTERPRISES

MAC address prefix 08:00:3F is registered to FRED KOSCHARA ENTERPRISES in the IEEE OUI registry. Any device whose MAC address begins with 08:00:3F has a network interface built by FRED KOSCHARA ENTERPRISES. 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 08:00:3F:00:00:00 to 08:00:3F:FF:FF:FF.

OUI prefix: 08:00:3F
Hyphen form: 08-00-3F
MAC range: 08:00:3F:00:00:00 – 08:00:3F:FF:FF:FF
Addresses in block: 16,777,216
Organization: FRED KOSCHARA ENTERPRISES
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 "FRED KOSCHARA ENTERPRISES"
archived source →
2026-07-17Assigned to "FRED KOSCHARA ENTERPRISES"

Nearby in the registry

The prefixes assigned immediately before and after 08:00:3F:

FAQ

Which company owns MAC address prefix 08:00:3F?: MAC address prefix 08:00:3F is registered to FRED KOSCHARA ENTERPRISES in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 08:00:3F has a network interface built by FRED KOSCHARA ENTERPRISES.
What is the OUI 08:00:3F?: 08:00:3F is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to FRED KOSCHARA ENTERPRISES. It covers every address from 08:00:3F:00:00:00 to 08:00:3F:FF:FF:FF, or 16,777,216 addresses in total. It is also written 08-00-3F.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 08:00:3F:00:00:00 that is 08:00:3F — 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.