Which company owns MAC address prefix DC:17:5A?

MAC address prefix DC:17:5A is registered to Hitachi High-Technologies Corporation in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with DC:17:5A has a network interface built by Hitachi High-Technologies Corporation.

What is the OUI DC:17:5A?

DC:17:5A is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Hitachi High-Technologies Corporation. It covers every address from DC:17:5A:00:00:00 to DC:17:5A:FF:FF:FF, or 16,777,216 addresses in total. It is also written DC-17-5A.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in DC:17:5A:00:00:00 that is DC:17:5A — 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 Hitachi High-Technologies Corporation located?

Hitachi High-Technologies Corporation is listed at 794, Higashitoyoi, Kudamatsu City, Yamaguchi Pref., JP 744-0002, in the IEEE OUI registry entry for DC:17:5A. This is the address the organization registered with the IEEE, which may differ from its current operating address.

Hitachi High-Technologies Corporation

MAC address prefix DC:17:5A is registered to Hitachi High-Technologies Corporation in the IEEE OUI registry. Any device whose MAC address begins with DC:17:5A has a network interface built by Hitachi High-Technologies 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 DC:17:5A:00:00:00 to DC:17:5A:FF:FF:FF.

OUI prefix: DC:17:5A
Hyphen form: DC-17-5A
MAC range: DC:17:5A:00:00:00 – DC:17:5A:FF:FF:FF
Addresses in block: 16,777,216
Organization: Hitachi High-Technologies Corporation
Address: 794, Higashitoyoi, Kudamatsu City, Yamaguchi Pref., JP 744-0002,
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 "Hitachi High-Technologies Corporation"
archived source →
2026-07-17Assigned to "Hitachi High-Technologies Corporation"

Nearby in the registry

The prefixes assigned immediately before and after DC:17:5A:

FAQ

Which company owns MAC address prefix DC:17:5A?: MAC address prefix DC:17:5A is registered to Hitachi High-Technologies Corporation in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with DC:17:5A has a network interface built by Hitachi High-Technologies Corporation.
What is the OUI DC:17:5A?: DC:17:5A is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to Hitachi High-Technologies Corporation. It covers every address from DC:17:5A:00:00:00 to DC:17:5A:FF:FF:FF, or 16,777,216 addresses in total. It is also written DC-17-5A.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in DC:17:5A:00:00:00 that is DC:17:5A — 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 Hitachi High-Technologies Corporation located?: Hitachi High-Technologies Corporation is listed at 794, Higashitoyoi, Kudamatsu City, Yamaguchi Pref., JP 744-0002, in the IEEE OUI registry entry for DC:17:5A. This is the address the organization registered with the IEEE, which may differ from its current operating address.