Which company owns MAC address prefix 40:42:29?

MAC address prefix 40:42:29 is registered to Layer3TV, Inc in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 40:42:29 has a network interface built by Layer3TV, Inc.

What is the OUI 40:42:29?

40:42:29 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Layer3TV, Inc. It covers every address from 40:42:29:00:00:00 to 40:42:29:FF:FF:FF, or 16,777,216 addresses in total. It is also written 40-42-29.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 40:42:29:00:00:00 that is 40:42:29 — 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 Layer3TV, Inc located?

Layer3TV, Inc is listed at 1660 Wynkoop St - Suite 800 Denver CO US 80202 in the IEEE OUI registry entry for 40:42:29. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Layer3TV, Inc

MAC address prefix 40:42:29 is registered to Layer3TV, Inc in the IEEE OUI registry. Any device whose MAC address begins with 40:42:29 has a network interface built by Layer3TV, 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 40:42:29:00:00:00 to 40:42:29:FF:FF:FF.

OUI prefix: 40:42:29
Hyphen form: 40-42-29
MAC range: 40:42:29:00:00:00 – 40:42:29:FF:FF:FF
Addresses in block: 16,777,216
Organization: Layer3TV, Inc
Address: 1660 Wynkoop St - Suite 800 Denver CO US 80202
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.

2017-09-08Assigned to "Layer3TV, Inc"
archived source →
2026-07-17Assigned to "Layer3TV, Inc"

Nearby in the registry

The prefixes assigned immediately before and after 40:42:29:

FAQ

Which company owns MAC address prefix 40:42:29?: MAC address prefix 40:42:29 is registered to Layer3TV, Inc in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 40:42:29 has a network interface built by Layer3TV, Inc.
What is the OUI 40:42:29?: 40:42:29 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Layer3TV, Inc. It covers every address from 40:42:29:00:00:00 to 40:42:29:FF:FF:FF, or 16,777,216 addresses in total. It is also written 40-42-29.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 40:42:29:00:00:00 that is 40:42:29 — 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 Layer3TV, Inc located?: Layer3TV, Inc is listed at 1660 Wynkoop St - Suite 800 Denver CO US 80202 in the IEEE OUI registry entry for 40:42:29. This is the address the organization registered with the IEEE, which may differ from its current operating address.