Mitsumi Electric Co., Ltd. holds seven MA-L (24-bit OUI) blocks with IEEE, all registered under the legal name "MITSUMI ELECTRIC CO.,LTD." to a single address in Tama-shi, Tokyo — 00:A0:96, 78:61:7C, C4:49:BB, F0:AB:54, BC:82:5D, 00:6F:F2, and F8:3C:80, together spanning roughly 117 million addresses. Mitsumi is a long-established Japanese OEM component maker (founded January 1954) that became a wholly-owned subsidiary of MinebeaMitsumi Inc. after a merger effective January 27, 2017. Its network-relevant output is overwhelmingly embedded modules supplied to other OEMs rather than standalone networking gear: Wi-Fi/wireless-LAN modules (802.11b/g/n), Bluetooth modules, and the internal Wi-Fi boards used in Nintendo handheld and console hardware — DWM-W006 in the DS Lite, DWM-W015 in the DSi, plus Wii-era boards. Because Mitsumi is a supplier, a Mitsumi OUI seen on a network most often belongs to consumer gaming hardware or an embedded wireless module inside consumer electronics, not to networking infrastructure. A practical caveat: the Wavit11 access-point line (00:A0:96, FCC ID EW4DWLA001) runs a proprietary ad-hoc protocol that is invisible to standard 802.11 scanners — a network-visibility gap rather than a named vulnerability. A separate MA-S block (8C:1F:64:AF:0/36) is registered to "MinebeaMitsumi Inc." — a distinct post-merger legal registrant — and is NOT attributed to this vendor slug.
- IEEE assignment
- 7 MA-L prefixes → MITSUMI ELECTRIC CO.,LTD. [Confirmed] — IEEE oui.csv (standards-oui.ieee.org), local snapshot fetched 2026-06-11
- Registry / block size
- MA-L (24-bit OUI); 7 IEEE prefixes (~117.4M addresses total) [Confirmed] — IEEE oui.csv. NOTE: IEEE's public OUI data publishes NO assignment/registration date (oui.csv columns are only Registry, Assignment, Organization Name, Organization Address); third-party tools (maclookup.app) show per-prefix dates spanning 1998–2022, but these are database artifacts, not IEEE facts.
- Verified prefixes (all MA-L, MITSUMI ELECTRIC CO.,LTD.)
- 00:A0:96, 78:61:7C, C4:49:BB, F0:AB:54, BC:82:5D, 00:6F:F2, F8:3C:80 [Confirmed] — IEEE oui.csv
- HQ / country
- 2-11-2, Tsurumaki, Tama-shi, Tokyo, JP 206-8567 (registry address) [Confirmed] — IEEE oui.csv; Tsurumaki, Tama, Tokyo, Japan [Confirmed] — en.wikipedia.org/wiki/Mitsumi_Electric
- Founded
- January 1954 [Confirmed] — en.wikipedia.org/wiki/Mitsumi_Electric
- Parent company
- MinebeaMitsumi Inc. (merger effective January 27, 2017; Mitsumi Electric became a wholly-owned subsidiary) [Confirmed] — en.wikipedia.org/wiki/Mitsumi_Electric
- Company website
- https://www.minebeamitsumi.com/ (parent group) [Likely] — en.wikipedia.org/wiki/Mitsumi_Electric
- Device types
- OEM electronic components and modules — Wi-Fi/wireless-LAN modules (802.11b/g/n), Bluetooth modules, consumer gaming peripherals (Nintendo DS/DSi/Wii Wi-Fi boards, game controllers), optical/floppy disc drives, keyboards and mice, RF receiver/transceiver modules, power ICs, motors, connectors [Confirmed] — en.wikipedia.org/wiki/Mitsumi_Electric, techinfodepot.shoutwiki.com, dsibrew.org
- Known device examples
- Wavit11 802.11b access point/bridge (OUI 00:A0:96, FCC ID EW4DWLA001, approved 2002; Mitsumi MW5701 CPU + Intersil HFA3861 radio; proprietary ad-hoc default mode, no HTTP config UI); DWM-W006 (Nintendo DS Lite internal Wi-Fi, MM3218 chip); DWM-W015 (Nintendo DSi internal Wi-Fi, MM3218 + Atheros AR6002G) [Confirmed] — techinfodepot.shoutwiki.com, dsibrew.org, westingames.com
- FCC grantee code
- EW4 (Mitsumi Electric Co., Ltd.) [Confirmed] — fccid.io/EW4DWMW052
- Security context
- No CVEs or named public security advisories found for Mitsumi wireless modules or OUI-prefixed devices. The Wavit11's proprietary ad-hoc protocol is invisible to standard 802.11 monitoring — a passive visibility gap, not a named exploit. A Mitsumi OUI on a network is most consistent with consumer gaming hardware or an embedded Wi-Fi module, not rogue infrastructure; no elevated threat profile identified. [Confirmed] — fccid.io/EW4DWMW052, techinfodepot.shoutwiki.com
- Related registrant (NOT this slug)
- MA-S 8C:1F:64:AF:0/36 → "MinebeaMitsumi Inc." in oui36.csv (distinct post-2017 legal registrant) [Confirmed] — IEEE oui36.csv
- Analyst note
- Mitsumi is an OEM component supplier; OUI presence indicates consumer/embedded hardware (especially Nintendo-era Wi-Fi) rather than standalone networking infrastructure. No MA-M (mam.csv) entries found for Mitsumi Electric.