Which company owns MAC address prefix F4:63:49?

MAC address prefix F4:63:49 is registered to Diffon Corporation in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with F4:63:49 has a network interface built by Diffon Corporation.

What is the OUI F4:63:49?

F4:63:49 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Diffon Corporation. It covers every address from F4:63:49:00:00:00 to F4:63:49:FF:FF:FF, or 16,777,216 addresses in total. It is also written F4-63-49.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in F4:63:49:00:00:00 that is F4:63:49 — 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 Diffon Corporation located?

Diffon Corporation is listed at Digital Tower Aston 1505 Seoul KR 153803 in the IEEE OUI registry entry for F4:63:49. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Diffon Corporation

MAC address prefix F4:63:49 is registered to Diffon Corporation in the IEEE OUI registry. Any device whose MAC address begins with F4:63:49 has a network interface built by Diffon Corporation. 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 F4:63:49:00:00:00 to F4:63:49:FF:FF:FF.

OUI prefix: F4:63:49
Hyphen form: F4-63-49
MAC range: F4:63:49:00:00:00 – F4:63:49:FF:FF:FF
Addresses in block: 16,777,216
Organization: Diffon Corporation
Address: Digital Tower Aston 1505 Seoul KR 153803
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 "Diffon Corporation"
archived source →
2026-07-17Assigned to "Diffon Corporation"

Nearby in the registry

The prefixes assigned immediately before and after F4:63:49:

FAQ

Which company owns MAC address prefix F4:63:49?: MAC address prefix F4:63:49 is registered to Diffon Corporation in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with F4:63:49 has a network interface built by Diffon Corporation.
What is the OUI F4:63:49?: F4:63:49 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Diffon Corporation. It covers every address from F4:63:49:00:00:00 to F4:63:49:FF:FF:FF, or 16,777,216 addresses in total. It is also written F4-63-49.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in F4:63:49:00:00:00 that is F4:63:49 — 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 Diffon Corporation located?: Diffon Corporation is listed at Digital Tower Aston 1505 Seoul KR 153803 in the IEEE OUI registry entry for F4:63:49. This is the address the organization registered with the IEEE, which may differ from its current operating address.