Which company owns MAC address prefix D4:0C:9D?

MAC address prefix D4:0C:9D is registered to SiFly Aviation, Inc in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with D4:0C:9D has a network interface built by SiFly Aviation, Inc.

What is the OUI D4:0C:9D?

D4:0C:9D is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to SiFly Aviation, Inc. It covers every address from D4:0C:9D:00:00:00 to D4:0C:9D:FF:FF:FF, or 16,777,216 addresses in total. It is also written D4-0C-9D.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in D4:0C:9D:00:00:00 that is D4:0C:9D — 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 SiFly Aviation, Inc located?

SiFly Aviation, Inc is listed at 3350 Scott Blvd Building 39-01 Santa Clara CA US 95054 in the IEEE OUI registry entry for D4:0C:9D. This is the address the organization registered with the IEEE, which may differ from its current operating address.

SiFly Aviation, Inc

MAC address prefix D4:0C:9D is registered to SiFly Aviation, Inc in the IEEE OUI registry. Any device whose MAC address begins with D4:0C:9D has a network interface built by SiFly Aviation, 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 D4:0C:9D:00:00:00 to D4:0C:9D:FF:FF:FF.

OUI prefix: D4:0C:9D
Hyphen form: D4-0C-9D
MAC range: D4:0C:9D:00:00:00 – D4:0C:9D:FF:FF:FF
Addresses in block: 16,777,216
Organization: SiFly Aviation, Inc
Address: 3350 Scott Blvd Building 39-01 Santa Clara CA US 95054
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.

2026-07-31Assigned to "SiFly Aviation, Inc"
archived source →

Nearby in the registry

The prefixes assigned immediately before and after D4:0C:9D:

FAQ

Which company owns MAC address prefix D4:0C:9D?: MAC address prefix D4:0C:9D is registered to SiFly Aviation, Inc in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with D4:0C:9D has a network interface built by SiFly Aviation, Inc.
What is the OUI D4:0C:9D?: D4:0C:9D is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to SiFly Aviation, Inc. It covers every address from D4:0C:9D:00:00:00 to D4:0C:9D:FF:FF:FF, or 16,777,216 addresses in total. It is also written D4-0C-9D.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in D4:0C:9D:00:00:00 that is D4:0C:9D — 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 SiFly Aviation, Inc located?: SiFly Aviation, Inc is listed at 3350 Scott Blvd Building 39-01 Santa Clara CA US 95054 in the IEEE OUI registry entry for D4:0C:9D. This is the address the organization registered with the IEEE, which may differ from its current operating address.