Hitachi, Ltd. — 4 prefixes (MA-L)

Hitachi, Ltd. — the core Tokyo-headquartered parent of the Hitachi group — holds four IEEE MA-L blocks that all normalize to this consolidated vendor entry: 00:00:87, 00:1F:67, 68:69:CA, and F8:48:97. IEEE's own listing spells the registrant four slightly different ways ("HITACHI, LTD.", "Hitachi,Ltd.", "Hitachi, Ltd."), and F8:48:97 is effectively a duplicate registration of 68:69:CA sharing the same org name and Shinagawa-ku, Tokyo address (27-18 Minami Oi 6-chome, Tokyo 140-8572), which matches Hitachi Ltd.'s registered address. The oldest block, 00:00:87 (Network Engineering Div., Tokyo 140), sits in the low 00:00:xx range consistent with an early Ethernet-era allocation. The critical scoping caveat: many other Hitachi-family entities — Hitachi Energy, Hitachi Rail, Hitachi Metals, Hitachi Data Systems / Vantara (D0:5F:CE), Hitachi Maxell, Hitachi High-Tech, Mitsubishi Hitachi Power Systems, Hitachi-LG Data Storage, and others — are SEPARATE IEEE registrants with their own distinct OUI blocks and must not be silently merged into this entry. Hitachi, Ltd. is a broad conglomerate whose Digital Systems & Services arm ships storage, servers, networking, ATMs, scanners, and industrial control platforms; burned-in MACs on that hardware are the practical relevance of these prefixes, though no public source links a specific one of the four blocks to a specific shipped device model. Hitachi runs an in-house CSIRT (HIRT) that publishes Hitachi Security Advisories through Japan's JVN framework; note that the well-publicized 2024–2025 CISA ICS advisories (RTU500, MACH GWS, etc.) belong to Hitachi Energy, a distinct registrant, not to these four prefixes.

IEEE assignment

4 prefixes → Hitachi, Ltd., registered Shinagawa-ku, Tokyo, JP [Confirmed] — IEEE MA-L

Registry / block size

MA-L (24-bit OUI) for all 4 assignments [Confirmed] — IEEE MA-L. NOTE: IEEE's public OUI data publishes NO assignment/registration date (the IEEE MA-L registry columns are only Registry, Assignment, Organization Name, Organization Address); any "date registered" on third-party tools is a database artifact, not an IEEE fact.

Verified prefixes (all MA-L, Hitachi, Ltd.)

00:00:87, 00:1F:67, 68:69:CA, F8:48:97 [Confirmed] — IEEE MA-L. F8:48:97 duplicates 68:69:CA's org name + address string.

HQ / country

27-18, Minami Oi 6-chome (Minamioi 6-27-18), Shinagawa-ku, Tokyo 140-8572, JP; 00:00:87 registers only "Network Engineering Div., Tokyo 140, JP" (no street) [Confirmed] — IEEE MA-L, hitachi.com

Company status

active [Likely] — hitachi.com (corporate site live; no independent status registry checked)

Industry

diversified conglomerate; Digital Systems & Services, Energy, Mobility, Connective Industries sectors [Likely] — hitachi.com

Device types

enterprise storage, servers, networking, ATMs, scanners, industrial/information-control platforms (e.g. RS90 Series control server) [Likely] — hitachi.com (general business/device-type corroboration; no source ties a specific core prefix to a specific model — that linkage is Unknown)

Registration date

Unknown / not applicable — IEEE OUI-family CSVs carry no date column; do not record or fabricate a date [Confirmed] — IEEE the IEEE MA-L registry column structure

Related / distinct registrants (NOT this entry)

Hitachi Energy (30:B2:16, 00:0D:97, 00:02:A3 — subject of 2024–2025 CISA ICS advisories), Hitachi Data Systems / Vantara (D0:5F:CE), Hitachi Rail, Hitachi Metals, Hitachi Maxell, Hitachi High-Tech, Hitachi-LG Data Storage [Confirmed distinct registrants] — IEEE MA-L, cisa.gov ICS advisories

Security context

Hitachi runs HIRT (Hitachi Incident Response Team), publishing Hitachi Security Advisories via Japan's JVN (JPCERT/CC + IPA) framework [Confirmed] — hitachi.com/hirt/. Hitachi Energy CVEs (e.g. CVE-2024-10037, CVE-2024-11499, CVE-2025-1445) belong to a DISTINCT registrant, not these four prefixes.

Analyst note

A globally-administered Hitachi, Ltd. OUI on one of these four blocks identifies genuine Hitachi, Ltd. hardware; do NOT attribute Hitachi Energy / Hitachi Rail / Vantara devices (separate OUIs) to this entry, and do not conflate Hitachi Energy ICS CVEs with these prefixes.