Which company owns MAC address prefix CC:F5:38?

MAC address prefix CC:F5:38 is registered to 3isysnetworks in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with CC:F5:38 has a network interface built by 3isysnetworks.

What is the OUI CC:F5:38?

CC:F5:38 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to 3isysnetworks. It covers every address from CC:F5:38:00:00:00 to CC:F5:38:FF:FF:FF, or 16,777,216 addresses in total. It is also written CC-F5-38.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in CC:F5:38:00:00:00 that is CC:F5:38 — 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 3isysnetworks located?

3isysnetworks is listed at 11F-2 No1247 , Jung Jeng RD , Taipei Taiwan TW 0000 in the IEEE OUI registry entry for CC:F5:38. This is the address the organization registered with the IEEE, which may differ from its current operating address.

3isysnetworks

MAC address prefix CC:F5:38 is registered to 3isysnetworks in the IEEE OUI registry. Any device whose MAC address begins with CC:F5:38 has a network interface built by 3isysnetworks. 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 CC:F5:38:00:00:00 to CC:F5:38:FF:FF:FF.

OUI prefix: CC:F5:38
Hyphen form: CC-F5-38
MAC range: CC:F5:38:00:00:00 – CC:F5:38:FF:FF:FF
Addresses in block: 16,777,216
Organization: 3isysnetworks
Address: 11F-2 No1247 , Jung Jeng RD , Taipei Taiwan TW 0000
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 "3isysnetworks"
archived source →
2026-07-17Assigned to "3isysnetworks"

Nearby in the registry

The prefixes assigned immediately before and after CC:F5:38:

FAQ

Which company owns MAC address prefix CC:F5:38?: MAC address prefix CC:F5:38 is registered to 3isysnetworks in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with CC:F5:38 has a network interface built by 3isysnetworks.
What is the OUI CC:F5:38?: CC:F5:38 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to 3isysnetworks. It covers every address from CC:F5:38:00:00:00 to CC:F5:38:FF:FF:FF, or 16,777,216 addresses in total. It is also written CC-F5-38.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in CC:F5:38:00:00:00 that is CC:F5:38 — 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 3isysnetworks located?: 3isysnetworks is listed at 11F-2 No1247 , Jung Jeng RD , Taipei Taiwan TW 0000 in the IEEE OUI registry entry for CC:F5:38. This is the address the organization registered with the IEEE, which may differ from its current operating address.