Which company owns MAC address prefix 94:FD:1D?

MAC address prefix 94:FD:1D is registered to WhereWhen Corp in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 94:FD:1D has a network interface built by WhereWhen Corp.

What is the OUI 94:FD:1D?

94:FD:1D is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to WhereWhen Corp. It covers every address from 94:FD:1D:00:00:00 to 94:FD:1D:FF:FF:FF, or 16,777,216 addresses in total. It is also written 94-FD-1D.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 94:FD:1D:00:00:00 that is 94:FD:1D — 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 WhereWhen Corp located?

WhereWhen Corp is listed at 96A Flynn Avenue Mountain View California US 94043 in the IEEE OUI registry entry for 94:FD:1D. This is the address the organization registered with the IEEE, which may differ from its current operating address.

WhereWhen Corp

MAC address prefix 94:FD:1D is registered to WhereWhen Corp in the IEEE OUI registry. Any device whose MAC address begins with 94:FD:1D has a network interface built by WhereWhen Corp. 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 94:FD:1D:00:00:00 to 94:FD:1D:FF:FF:FF.

OUI prefix: 94:FD:1D
Hyphen form: 94-FD-1D
MAC range: 94:FD:1D:00:00:00 – 94:FD:1D:FF:FF:FF
Addresses in block: 16,777,216
Organization: WhereWhen Corp
Address: 96A Flynn Avenue Mountain View California US 94043
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 "WhereWhen Corp"
archived source →
2026-07-17Assigned to "WhereWhen Corp"

Nearby in the registry

The prefixes assigned immediately before and after 94:FD:1D:

FAQ

Which company owns MAC address prefix 94:FD:1D?: MAC address prefix 94:FD:1D is registered to WhereWhen Corp in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 94:FD:1D has a network interface built by WhereWhen Corp.
What is the OUI 94:FD:1D?: 94:FD:1D is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to WhereWhen Corp. It covers every address from 94:FD:1D:00:00:00 to 94:FD:1D:FF:FF:FF, or 16,777,216 addresses in total. It is also written 94-FD-1D.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 94:FD:1D:00:00:00 that is 94:FD:1D — 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 WhereWhen Corp located?: WhereWhen Corp is listed at 96A Flynn Avenue Mountain View California US 94043 in the IEEE OUI registry entry for 94:FD:1D. This is the address the organization registered with the IEEE, which may differ from its current operating address.