Which company owns MAC address prefix 38:B5:D3?

MAC address prefix 38:B5:D3 is registered to SecuWorks in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 38:B5:D3 has a network interface built by SecuWorks.

What is the OUI 38:B5:D3?

38:B5:D3 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to SecuWorks. It covers every address from 38:B5:D3:00:00:00 to 38:B5:D3:FF:FF:FF, or 16,777,216 addresses in total. It is also written 38-B5-D3.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 38:B5:D3:00:00:00 that is 38:B5:D3 — 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 SecuWorks located?

SecuWorks is listed at #709, 218 Gajeong-ro Yuseong -gu Daejeon KR 34129 in the IEEE OUI registry entry for 38:B5:D3. This is the address the organization registered with the IEEE, which may differ from its current operating address.

SecuWorks

MAC address prefix 38:B5:D3 is registered to SecuWorks in the IEEE OUI registry. Any device whose MAC address begins with 38:B5:D3 has a network interface built by SecuWorks. 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 38:B5:D3:00:00:00 to 38:B5:D3:FF:FF:FF.

OUI prefix: 38:B5:D3
Hyphen form: 38-B5-D3
MAC range: 38:B5:D3:00:00:00 – 38:B5:D3:FF:FF:FF
Addresses in block: 16,777,216
Organization: SecuWorks
Address: #709, 218 Gajeong-ro Yuseong -gu Daejeon KR 34129
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.

2020-11-28Assigned to "SecuWorks"
archived source →
2026-07-17Assigned to "SecuWorks"

Nearby in the registry

The prefixes assigned immediately before and after 38:B5:D3:

FAQ

Which company owns MAC address prefix 38:B5:D3?: MAC address prefix 38:B5:D3 is registered to SecuWorks in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 38:B5:D3 has a network interface built by SecuWorks.
What is the OUI 38:B5:D3?: 38:B5:D3 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to SecuWorks. It covers every address from 38:B5:D3:00:00:00 to 38:B5:D3:FF:FF:FF, or 16,777,216 addresses in total. It is also written 38-B5-D3.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 38:B5:D3:00:00:00 that is 38:B5:D3 — 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 SecuWorks located?: SecuWorks is listed at #709, 218 Gajeong-ro Yuseong -gu Daejeon KR 34129 in the IEEE OUI registry entry for 38:B5:D3. This is the address the organization registered with the IEEE, which may differ from its current operating address.