Moxa holds two MA-L blocks in the IEEE registry, recorded under two name variants for the same Taiwanese company: the long-standing 00:90:E8 block registered to "MOXA TECHNOLOGIES CORP., LTD." at a Taipei address, and a newer 50:0B:88 block registered to "Moxa Inc." in New Taipei City. Moxa is an industrial networking, edge-computing, and automation maker founded in 1987 and headquartered in Taipei (with a US subsidiary, Moxa Americas Inc., in Brea, California). Its OUIs appear on operational-technology (OT) gear: industrial Ethernet switches, secure/cellular routers, wireless APs, NPort serial device servers, protocol gateways, media converters, and x86/Arm industrial computers — equipment that lives in manufacturing, rail, power, oil and gas, marine, and intelligent-transportation environments. For triage, a Moxa OUI on a network almost always marks an industrial/ICS device rather than office IT, and it warrants attention: Moxa products — particularly the NPort serial servers and cellular/secure routers — carry a long history of CISA ICS-CERT advisories (unauthenticated firmware update, buffer-overflow RCE, authorization bypass, credential and information-disclosure flaws), including recent 2025–2026 CVEs. A Moxa MAC in a critical-infrastructure segment should be confirmed as a managed, patched asset, not an unmanaged or end-of-life unit.
- IEEE assignment
- 2 prefixes → 00:90:E8 (MOXA TECHNOLOGIES CORP., LTD., Taipei) and 50:0B:88 (Moxa Inc., New Taipei City), both MA-L, TW [Confirmed] — IEEE MA-L (oui.csv)
- Registry / block size
- MA-L (24-bit OUI); 2 blocks found in oui.csv; no entries in MA-M (mam.csv) or MA-S (oui36.csv) [Confirmed] — IEEE MA-L. NOTE: IEEE's public OUI data publishes NO assignment/registration date (oui.csv columns are only Registry, Assignment, Organization Name, Organization Address); any "date registered" on third-party tools (e.g. maclookup.app shows 2000-11-09 for 00:90:E8 and 2024-12-11 for 50:0B:88) is a database artifact, not an IEEE fact.
- HQ / country
- Taipei, Taiwan (registry addresses: 00:90:E8 → Taipei; 50:0B:88 → 13F, No. 3, Sec. 4, New Taipei Blvd., Xinzhuang Dist., New Taipei City 242032, TW). US subsidiary: Moxa Americas Inc., Brea, CA [Confirmed] — IEEE MA-L; Wikipedia (Moxa Technologies)
- Company status
- active; founded 1987; private company [Confirmed] — moxa.com (company profile); Wikipedia (Moxa Technologies)
- Device types
- industrial Ethernet switches, secure/cellular routers, wireless APs/bridges/clients, network security appliances, media converters, NPort serial device servers, protocol gateways, OPC UA gateways, x86/Arm industrial computers, panel PCs, IIoT gateways [Confirmed] — moxa.com (industrial network infrastructure)
- Notable products
- NPort serial device servers; EDS/MGate/AWK/OnCell product lines; primarily OT/ICS context
- Verified prefixes (both MA-L)
- 00:90:E8 (MOXA TECHNOLOGIES CORP., LTD.), 50:0B:88 (Moxa Inc.) [Confirmed] — IEEE MA-L; hwaddress.com; maclookup.app
- Name-variant note
- the two blocks are recorded verbatim under different names — "MOXA TECHNOLOGIES CORP., LTD." (all-caps, older) and "Moxa Inc." (mixed-case, newer) — for the same company [Confirmed] — IEEE MA-L
- Security note
- Moxa devices have a substantial CISA ICS-CERT advisory history (unauthenticated firmware update, buffer-overflow RCE, authorization bypass, credential management, information disclosure, XSS/CSRF, OS command injection); recent examples include CVE-2025-1977/CVE-2025-2026 (NPort 6100-G2/6200-G2) and CVE-2026-0714/CVE-2026-0715 (industrial computers). List is illustrative, not exhaustive [Confirmed history; specific CVE set is a current snapshot] — CISA ICS advisories; Moxa security advisories
- Related vendors
- TXOne Networks (OT/IIoT security; co-founded 2018 by Moxa with Trend Micro — likely separate OUI registrations) [Likely] — Wikipedia (Moxa Technologies)
- Analyst note
- A Moxa OUI almost always marks an industrial/ICS asset, not office IT; given Moxa's advisory history, treat such a MAC in a critical-infrastructure segment as warranting verification that it is managed and patched.