Which company owns MAC address prefix EC:71:5E?

MAC address prefix EC:71:5E is registered to Freefly Systems Inc in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with EC:71:5E has a network interface built by Freefly Systems Inc.

What is the OUI EC:71:5E?

EC:71:5E is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Freefly Systems Inc. It covers every address from EC:71:5E:00:00:00 to EC:71:5E:FF:FF:FF, or 16,777,216 addresses in total. It is also written EC-71-5E.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in EC:71:5E:00:00:00 that is EC:71:5E — 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 Freefly Systems Inc located?

Freefly Systems Inc is listed at 16650 Woodinville-Redmond RD NE, Bldg D Woodinville WA US 98072 in the IEEE OUI registry entry for EC:71:5E. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Freefly Systems Inc

MAC address prefix EC:71:5E is registered to Freefly Systems Inc in the IEEE OUI registry. Any device whose MAC address begins with EC:71:5E has a network interface built by Freefly Systems 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 EC:71:5E:00:00:00 to EC:71:5E:FF:FF:FF.

OUI prefix: EC:71:5E
Hyphen form: EC-71-5E
MAC range: EC:71:5E:00:00:00 – EC:71:5E:FF:FF:FF
Addresses in block: 16,777,216
Organization: Freefly Systems Inc
Address: 16650 Woodinville-Redmond RD NE, Bldg D Woodinville WA US 98072
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.

2026-06-20Assigned to "Freefly Systems Inc"
archived source →
2026-07-17Assigned to "Freefly Systems Inc"

Nearby in the registry

The prefixes assigned immediately before and after EC:71:5E:

FAQ

Which company owns MAC address prefix EC:71:5E?: MAC address prefix EC:71:5E is registered to Freefly Systems Inc in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with EC:71:5E has a network interface built by Freefly Systems Inc.
What is the OUI EC:71:5E?: EC:71:5E is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Freefly Systems Inc. It covers every address from EC:71:5E:00:00:00 to EC:71:5E:FF:FF:FF, or 16,777,216 addresses in total. It is also written EC-71-5E.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in EC:71:5E:00:00:00 that is EC:71:5E — 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 Freefly Systems Inc located?: Freefly Systems Inc is listed at 16650 Woodinville-Redmond RD NE, Bldg D Woodinville WA US 98072 in the IEEE OUI registry entry for EC:71:5E. This is the address the organization registered with the IEEE, which may differ from its current operating address.