I-O DATA DEVICE, INC. — 3 prefixes (MA-L)

I-O DATA DEVICE, INC. is a Japanese computer-peripheral and networking-hardware manufacturer headquartered in Kanazawa, Ishikawa Prefecture, and listed on the Tokyo Stock Exchange (ticker 6916). It holds three separate MA-L (24-bit) OUI blocks — 00:A0:B0, 34:76:C5, and 50:41:B9 — all registered to the exact same organization name "I-O DATA DEVICE,INC." in the IEEE registry, each with a slightly different Kanazawa address string. Holding three MA-L blocks across different eras is itself substance: it is the footprint of an ongoing hardware maker exhausting one 16.7-million-address block and being assigned another, not a one-off shell registration. The company's product line is squarely the kind of hardware that carries these prefixes — network-attached storage (LAN DISK, fidata), wired and wireless LAN routers and hubs, network cameras, and IoT/LTE routers. For an analyst classifying devices by MAC prefix, these OUIs reliably flag I-O DATA network hardware, and the vendor has a real, patched CVE history worth noting: its routers have appeared in multiple JVN (Japan Vulnerability Notes) advisories, including 2024 command-injection CVEs on the UD-LT1 series and 2025 advisories on the WN-7D36QR wireless router. As always for OUI data, IEEE publishes no registration date for any of these blocks — any "date registered" seen on third-party lookup tools is a database artifact, not an IEEE fact.

IEEE assignment

3 prefixes → I-O DATA DEVICE,INC., registered Kanazawa, Ishikawa, JP [Confirmed] — IEEE MA-L (lines 1647 / 9689 / 17459)

Registry / block size

MA-L (24-bit OUI), 3 blocks (~50.3M addresses). No MA-M or MA-S (36-bit) blocks found for this org [Confirmed] — the IEEE MA-L registry, the IEEE MA-M registry, the IEEE MA-S registry (no matches in the latter two)

Verified prefixes (all MA-L, I-O DATA DEVICE,INC.)

00:A0:B0, 34:76:C5, 50:41:B9 [Confirmed] — IEEE the IEEE MA-L registry (00A0B0 line 1647; 3476C5 line 17459; 5041B9 line 9689), cross-checked against maclookup.app

Registry address

Kanazawa, Ishikawa, JP (older block: "24-1, Sakurada-machi, Kanazawa, Ishikawa 920"; newer blocks: "3-10, Sakurada-machi, Kanazawa, Ishikawa 920-8512") [Confirmed] — IEEE MA-L address fields

HQ / country

Kanazawa, Ishikawa Prefecture, Japan [Confirmed] — iodata.com

Company status

active; publicly traded on the Tokyo Stock Exchange (ticker 6916); founded 1976 [Likely] — TSE:6916 listing (single-source financial-listing corroboration; corporate identity itself is Confirmed via iodata.com)

Device types

NAS (LAN DISK, fidata), wired/wireless LAN routers, network hubs, network cameras, IoT/LTE routers [Confirmed] — iodata.com product catalog

Notable products

LAN DISK / fidata NAS series; WN-series and UD-series routers

Security note

I-O DATA routers appear in multiple JVN advisories — 2024 OS-command-injection CVEs on UD-LT1 / UD-LT1-EX (CVE-2024-45841, CVE-2024-47133, CVE-2024-52564; patched in firmware 2.1.9) and 2025 advisories on the WN-7D36QR wireless router (JVNVU#97490987, CVE-2025-55075 + CVE-2025-58116; fixed in firmware 2.1.3). Relevant context when flagging these devices by MAC prefix.

[Likely] — jvn.jp (Japan Vulnerability Notes); single-registry source

No-date note

IEEE public OUI data (the IEEE MA-L registry columns: Registry, Assignment, Organization Name, Organization Address) publishes NO assignment/registration date. Third-party "date registered" values (e.g. maclookup.app's 1998/2012/2019) are database artifacts, not IEEE facts, and are not recorded here.

[Confirmed] — standards-oui.ieee.org/oui/oui.csv

Analyst note

A globally-administered I-O DATA OUI reliably identifies genuine I-O DATA network hardware (NAS/routers/cameras). Multiple blocks across eras mean device age varies; OUI alone does not indicate firmware/patch level, which matters given the vendor's active CVE history.