Mitsubishi Electric Corporation — 7 prefixes (MA-L)

Mitsubishi Electric Corporation, the Tokyo-headquartered industrial and electronics conglomerate, holds seven MA-L (24-bit) OUI blocks registered to the exact organization string "Mitsubishi Electric Corporation" — a modest but real footprint compared to consumer giants, consistent with a company whose network-facing hardware sits mostly in industrial and building-systems niches rather than mass-market consumer devices. The two corroborated product lines behind these prefixes are MELSEC, Mitsubishi Electric's family of programmable logic controllers (PLC) with Ethernet interface modules used across factory-automation networks, and MELCloud, the vendor's cloud service for remote control of Ecodan and other HVAC/air-conditioning equipment. Both lines carry independent corroboration: MELSEC modules are the named target of a long run of CISA/ICS-CERT industrial-control-system advisories stretching from 2016 through 2026, which confirms these OUIs identify real, currently-deployed network devices rather than dormant or shell registrations. Mitsubishi Electric Corporation should not be confused with the many adjacent but organizationally distinct Mitsubishi entities — regional subsidiaries (US, Europe, India, China), joint ventures with Toshiba, and separate heavy-industries or precision divisions — each of which holds its own, separately-registered OUI blocks under a different organization string.

Registry class

MA-L only; no matching MA-M or MA-S block for the exact string "Mitsubishi Electric Corporation" [Confirmed] — the IEEE MA-L registry, the IEEE MA-M registry, the IEEE MA-S registry

Matching OUI blocks (7, MA-L, "Mitsubishi Electric Corporation")

38:E0:8E, 10:4B:46, 58:52:8A, 30:BE:3B, 28:E9:8E, 00:26:92, 94:A4:B5 [Confirmed] — the IEEE MA-L registry (lines 3877, 10194, 10605, 24977, 33548, 33957, 38304); 6 of the 7 further cross-corroborated by two independent third-party aggregators (94:A4:B5 appears on one of the two) — https://maclookup.app/vendors/mitsubishi-electric-corporation, https://www.netify.ai/resources/macs/brands/mitsubishi-electric

Registered address

2-7-3 Marunouchi, Chiyoda-ku, Tokyo, JP 100-8310 for 6 of 7 blocks; the 10:4B:46 block carries a shorter registry string ("2-7-3 Chiyoda-ku Tokyo JP 100-8310", omitting "Marunouchi") — same location, registry data-entry variance, not a different address [Confirmed] — the IEEE MA-L registry

Date registered

null — IEEE's public OUI/MAM/OUI36 data has no assignment/registration-date field for any of the 7 blocks; not fabricated [Confirmed absence] — the IEEE MA-L registry. Third-party aggregator "registered"/"updated" dates (e.g. maclookup.app) are database-crawl artifacts, not IEEE facts, and are excluded.

IANA Reference

not applicable — no IANA RFC reference exists for an IEEE MA-L vendor block; left blank rather than fabricated [Confirmed]

Device types

MELSEC PLC / factory-automation Ethernet interface modules (industrial/OT networks); MELCloud, a cloud service for remote control of Mitsubishi Electric HVAC/Ecodan air-conditioning systems

[Confirmed] — https://www.mitsubishielectric.com/fa/products/cnt/plcr/pmerit/network/ethernet.html, https://melcloudhome.com/

Security corroboration

multiple CISA/ICS-CERT advisories targeting MELSEC PLC Ethernet/network modules from 2016 through 2026 confirm real, actively deployed devices under these OUIs [Confirmed] — https://www.cisa.gov/news-events/ics-advisories/icsa-23-306-03, https://ics-cert.us-cert.gov/advisories/ICSA-16-336-03, https://www.cisa.gov/news-events/ics-advisories/icsa-24-324-01, https://www.cisa.gov/news-events/ics-advisories/icsa-26-036-02

Company status

active [Likely] — recency of the 2026-dated ICS advisory (ICSA-26-036-02) against current MELSEC hardware implies an active, currently-shipping organization; not independently confirmed via a corporate status page this pass — https://www.mitsubishielectric.com

Related-but-distinct entities excluded from this entry (separate OUI blocks, separate organization strings)

Toshiba Mitsubishi-Electric Industrial Systems Corporation (98:6D:C8); Mitsubishi Electric System & Service Co., Ltd. (00:0A:66 MA-L + an MA-S sibling); Mitsubishi Electric Automation (China) Ltd. (58:8D:39); Mitsubishi Electric US, Inc. (MA-M); Mitsubishi Electric Europe B.V UK Branch (MA-M); Mitsubishi Electric India Pvt. Ltd. (multiple MA-S blocks); Mitsubishi Electric Micro-Computer Application Software Co., Ltd. and Mitsubishi Electric Klimat Transportation Systems S.p.A. (MA-S)

[Confirmed] — the IEEE MA-L registry, the IEEE MA-M registry

Unconfirmed extra prefixes

one aggregator (netify.ai) listed additional malformed/truncated "prefix" strings attributed to India/US/China/Italy entities; these correspond to the distinct-org registrations above, not to "Mitsubishi Electric Corporation" itself, and are not merged into this entry

[Unknown / excluded] — https://www.netify.ai/resources/macs/brands/mitsubishi-electric