Which company owns MAC address prefix 38:E0:54?

MAC address prefix 38:E0:54 is registered to Security Design, Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 38:E0:54 has a network interface built by Security Design, Inc..

What is the OUI 38:E0:54?

38:E0:54 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Security Design, Inc.. It covers every address from 38:E0:54:00:00:00 to 38:E0:54:FF:FF:FF, or 16,777,216 addresses in total. It is also written 38-E0-54.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 38:E0:54:00:00:00 that is 38:E0:54 — 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 Security Design, Inc. located?

Security Design, Inc. is listed at Nishiki-cho Trad Square 4F, 3-20 Kanda Nishiki-cho Chiyoda-ku Tokyo JP 101-0054 in the IEEE OUI registry entry for 38:E0:54. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Security Design, Inc.

MAC address prefix 38:E0:54 is registered to Security Design, Inc. in the IEEE OUI registry. Any device whose MAC address begins with 38:E0:54 has a network interface built by Security Design, 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 38:E0:54:00:00:00 to 38:E0:54:FF:FF:FF.

OUI prefix: 38:E0:54
Hyphen form: 38-E0-54
MAC range: 38:E0:54:00:00:00 – 38:E0:54:FF:FF:FF
Addresses in block: 16,777,216
Organization: Security Design, Inc.
Address: Nishiki-cho Trad Square 4F, 3-20 Kanda Nishiki-cho Chiyoda-ku Tokyo JP 101-0054
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.

2026-01-08Assigned to "Security Design, Inc."
archived source →
2026-07-17Assigned to "Security Design, Inc."

Nearby in the registry

The prefixes assigned immediately before and after 38:E0:54:

FAQ

Which company owns MAC address prefix 38:E0:54?: MAC address prefix 38:E0:54 is registered to Security Design, Inc. in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 38:E0:54 has a network interface built by Security Design, Inc..
What is the OUI 38:E0:54?: 38:E0:54 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Security Design, Inc.. It covers every address from 38:E0:54:00:00:00 to 38:E0:54:FF:FF:FF, or 16,777,216 addresses in total. It is also written 38-E0-54.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 38:E0:54:00:00:00 that is 38:E0:54 — 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 Security Design, Inc. located?: Security Design, Inc. is listed at Nishiki-cho Trad Square 4F, 3-20 Kanda Nishiki-cho Chiyoda-ku Tokyo JP 101-0054 in the IEEE OUI registry entry for 38:E0:54. This is the address the organization registered with the IEEE, which may differ from its current operating address.