HIOKI E.E. CORPORATION — 2 prefixes (MA-L)

A MAC address starting with 00:01:67 or 00:C0:9C belongs to HIOKI E.E. CORPORATION, a Japanese electrical test-and-measurement instrument manufacturer, typically seen on networked lab or field measurement gear rather than consumer devices.

Hioki is headquartered at 81 Koizumi, Ueda, Nagano 386-1192, Japan, and both prefixes resolve to that same registrant name and address in the local IEEE-sourced OUI mirror. Two distinct MA-L blocks assigned to one identifiable, product-shipping company is more substance than a bare single-OUI registration.

Hioki's own product line — resistance meters, memory HiCorders/data loggers, battery testers, and power analyzers — is where these prefixes are most plausibly seen. Independent corroboration comes from Hioki's own support site, which documents how to locate the MAC address on a real shipping product, the MR6000 Memory HiCorder, confirming the vendor ships networked instruments carrying these addresses.

No CVE or security advisory naming Hioki was found in a search conducted in August 2026; that is a search-outcome negative, not a certified clean history, since a direct NVD database query could not be completed in this pass.

IEEE assignment

two MA-L prefixes → HIOKI E.E. CORPORATION, registered 81 Koizumi, Ueda, Nagano, Japan [Confirmed] — the IEEE MA-L registry 000167, the IEEE MA-L registry 00C09C

Registry / block size

MA-L (24-bit OUI); 2 confirmed prefix assignments in the local registry mirror [Confirmed] — the IEEE MA-L registry 000167, the IEEE MA-L registry 00C09C

HQ / country

81 Koizumi, Ueda, Nagano 386-1192, Japan [Confirmed] — the IEEE MA-L registry 000167

Company status

active [Confirmed] — https://www.hioki.com/en/corporate/

Device types

resistance meters, memory HiCorders/data loggers, battery testers, power analyzers [Confirmed] — https://www.hioki.com/en/corporate/

Notable products

MR6000 Memory HiCorder (confirmed to expose a MAC address per Hioki's own support documentation) [Confirmed] — https://www.hioki.com/us-en/support/faq/detail/id_425

Verified sample prefixes

00:01:67, 00:C0:9C — both MA-L, non-shared /24 blocks (not sub-allocations of a large IEEE-held base) [Confirmed] — the IEEE MA-L registry 000167, the IEEE MA-L registry 00C09C

the IEEE MA-M registry / the IEEE MA-S registry cross-check

no additional Hioki entries found in either registry, consistent with a 2-prefix footprint [Confirmed] — the IEEE MA-M registry, the IEEE MA-S registry

Registration dates

Unknown as IEEE facts — IEEE's public OUI registry publishes no assignment/registration-date field; third-party "date registered" figures seen elsewhere are database artifacts, not IEEE facts, and are not recorded here [Unknown] — n/a

Security context

no CVE or security advisory naming Hioki found as of an August 2026 search; direct NVD database query could not be completed this pass, so this is a limited-confidence negative [Likely] — (WebSearch, no direct NVD confirmation)

Related vendors

none identified [Unknown] — n/a

Analyst note

devices carrying a 00:01:67 or 00:C0:9C MAC prefix are attributable specifically to HIOKI E.E. CORPORATION (each is a dedicated, non-shared /24 block), consistent with Hioki's known networked test-and-measurement product line; no security concerns are recorded against the vendor as of an August 2026 search

[Likely] — https://www.hioki.com/us-en/support/faq/detail/id_425