Which company owns MAC address prefix 78:55:17?

MAC address prefix 78:55:17 is registered to SankyuElectronics in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 78:55:17 has a network interface built by SankyuElectronics.

What is the OUI 78:55:17?

78:55:17 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to SankyuElectronics. It covers every address from 78:55:17:00:00:00 to 78:55:17:FF:FF:FF, or 16,777,216 addresses in total. It is also written 78-55-17.

How do I find the manufacturer of a MAC address?

Take the first three octets of the address — in 78:55:17:00:00:00 that is 78:55:17 — 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 SankyuElectronics located?

SankyuElectronics is listed at 2-30-12 Ohta-ku Tokyo JP 146-0091 in the IEEE OUI registry entry for 78:55:17. This is the address the organization registered with the IEEE, which may differ from its current operating address.

SankyuElectronics

MAC address prefix 78:55:17 is registered to SankyuElectronics in the IEEE OUI registry. Any device whose MAC address begins with 78:55:17 has a network interface built by SankyuElectronics. 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 78:55:17:00:00:00 to 78:55:17:FF:FF:FF.

OUI prefix: 78:55:17
Hyphen form: 78-55-17
MAC range: 78:55:17:00:00:00 – 78:55:17:FF:FF:FF
Addresses in block: 16,777,216
Organization: SankyuElectronics
Address: 2-30-12 Ohta-ku Tokyo JP 146-0091
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 "SankyuElectronics"
archived source →
2026-07-17Assigned to "SankyuElectronics"

Nearby in the registry

The prefixes assigned immediately before and after 78:55:17:

FAQ

Which company owns MAC address prefix 78:55:17?: MAC address prefix 78:55:17 is registered to SankyuElectronics in the IEEE Organizationally Unique Identifier (OUI) registry. Any device whose MAC address begins with 78:55:17 has a network interface built by SankyuElectronics.
What is the OUI 78:55:17?: 78:55:17 is an Organizationally Unique Identifier — the first three octets (24 bits) of a MAC address, assigned by the IEEE to SankyuElectronics. It covers every address from 78:55:17:00:00:00 to 78:55:17:FF:FF:FF, or 16,777,216 addresses in total. It is also written 78-55-17.
How do I find the manufacturer of a MAC address?: Take the first three octets of the address — in 78:55:17:00:00:00 that is 78:55:17 — 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 SankyuElectronics located?: SankyuElectronics is listed at 2-30-12 Ohta-ku Tokyo JP 146-0091 in the IEEE OUI registry entry for 78:55:17. This is the address the organization registered with the IEEE, which may differ from its current operating address.