Which company owns MAC address prefix 38:45:4C?

MAC address prefix 38:45:4C is registered to Light Labs, Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 38:45:4C has a network interface built by Light Labs, Inc..

What is the OUI 38:45:4C?

38:45:4C is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Light Labs, Inc.. It covers every address from 38:45:4C:00:00:00 to 38:45:4C:FF:FF:FF, or 16,777,216 addresses in total. It is also written 38-45-4C.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 38:45:4C:00:00:00 that is 38:45:4C — 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 Light Labs, Inc. located?

Light Labs, Inc. is listed at 636 Ramona St. Palo Alto CA US 94301 in the IEEE OUI registry entry for 38:45:4C. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Light Labs, Inc.

MAC address prefix 38:45:4C is registered to Light Labs, Inc. in the IEEE OUI registry. Any device whose MAC address begins with 38:45:4C has a network interface built by Light Labs, 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 38:45:4C:00:00:00 to 38:45:4C:FF:FF:FF.

OUI prefix: 38:45:4C
Hyphen form: 38-45-4C
MAC range: 38:45:4C:00:00:00 – 38:45:4C:FF:FF:FF
Addresses in block: 16,777,216
Organization: Light Labs, Inc.
Address: 636 Ramona St. Palo Alto CA US 94301
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 "Light Labs, Inc."
archived source →
2026-07-17Assigned to "Light Labs, Inc."

Nearby in the registry

The prefixes assigned immediately before and after 38:45:4C:

FAQ

Which company owns MAC address prefix 38:45:4C?: MAC address prefix 38:45:4C is registered to Light Labs, Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 38:45:4C has a network interface built by Light Labs, Inc..
What is the OUI 38:45:4C?: 38:45:4C is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Light Labs, Inc.. It covers every address from 38:45:4C:00:00:00 to 38:45:4C:FF:FF:FF, or 16,777,216 addresses in total. It is also written 38-45-4C.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 38:45:4C:00:00:00 that is 38:45:4C — 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 Light Labs, Inc. located?: Light Labs, Inc. is listed at 636 Ramona St. Palo Alto CA US 94301 in the IEEE OUI registry entry for 38:45:4C. This is the address the organization registered with the IEEE, which may differ from its current operating address.