Which company owns MAC address prefix 20:F8:3B?

MAC address prefix 20:F8:3B is registered to Nabu Casa, Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 20:F8:3B has a network interface built by Nabu Casa, Inc..

What is the OUI 20:F8:3B?

20:F8:3B is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Nabu Casa, Inc.. It covers every address from 20:F8:3B:00:00:00 to 20:F8:3B:FF:FF:FF, or 16,777,216 addresses in total. It is also written 20-F8-3B.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 20:F8:3B:00:00:00 that is 20:F8:3B — 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 Nabu Casa, Inc. located?

Nabu Casa, Inc. is listed at 8 The Green, Suite 12630 Dover DE US 19901 in the IEEE OUI registry entry for 20:F8:3B. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Nabu Casa, Inc.

MAC address prefix 20:F8:3B is registered to Nabu Casa, Inc. in the IEEE OUI registry. Any device whose MAC address begins with 20:F8:3B has a network interface built by Nabu Casa, Inc.. 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 20:F8:3B:00:00:00 to 20:F8:3B:FF:FF:FF.

OUI prefix: 20:F8:3B
Hyphen form: 20-F8-3B
MAC range: 20:F8:3B:00:00:00 – 20:F8:3B:FF:FF:FF
Addresses in block: 16,777,216
Organization: Nabu Casa, Inc.
Address: 8 The Green, Suite 12630 Dover DE US 19901
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 (1)

The IEEE registry publishes current state only — this is the change record we've kept since we started tracking it daily.

2026-07-17Assigned to "Nabu Casa, Inc."

Nearby in the registry

The prefixes assigned immediately before and after 20:F8:3B:

FAQ

Which company owns MAC address prefix 20:F8:3B?: MAC address prefix 20:F8:3B is registered to Nabu Casa, Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 20:F8:3B has a network interface built by Nabu Casa, Inc..
What is the OUI 20:F8:3B?: 20:F8:3B is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Nabu Casa, Inc.. It covers every address from 20:F8:3B:00:00:00 to 20:F8:3B:FF:FF:FF, or 16,777,216 addresses in total. It is also written 20-F8-3B.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 20:F8:3B:00:00:00 that is 20:F8:3B — 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 Nabu Casa, Inc. located?: Nabu Casa, Inc. is listed at 8 The Green, Suite 12630 Dover DE US 19901 in the IEEE OUI registry entry for 20:F8:3B. This is the address the organization registered with the IEEE, which may differ from its current operating address.