OMRON Corporation is a major Japanese electronics manufacturer founded in 1933 and headquartered at Shiokoji Horikawa, Shimogyo-ku, Kyoto, Japan. Across the Omron group, IEEE has issued six assignments: two MA-L blocks registered directly to "OMRON Corporation" (3C:F7:D1 and 80:B5:C6), three additional MA-L registrations tied to healthcare and predecessor names (B0:49:5F and 00:22:09 to OMRON/Omron Healthcare Co. Ltd., and the legacy 00:00:0A registered to "OMRON TATEISI ELECTRONICS CO." — the company's former name before it adopted "Omron" branding), and one MA-M block (D4:7C:44:3x) registered to subsidiary OMRON SENTECH CO., LTD. Consolidating these under a single vendor entry is more useful than minting near-identical per-prefix pages, because they all trace back to the same corporate group. The reason an Omron OUI matters for network work is what the hardware is: the parent blocks appear chiefly on industrial automation and control gear — Programmable Logic Controllers and Machine Automation Controllers in the CJ, CS, NJ, and NX Sysmac families — which speak EtherNet/IP (CIP) on modern controllers and legacy FINS-over-Ethernet on older ones. The security caveat is the load-bearing one: Omron's network-connected PLCs are confirmed ICS/OT attack targets. The state-sponsored Pipedream/Incontroller framework included a component ("BadOmen") that exploited the HTTP server interface on NX/NJ controllers via CVE-2022-34151 (hardcoded credentials, CVSS 9.0), and CISA has issued multiple ICS advisories covering Omron controllers. Seeing an Omron MAC on a network therefore strongly suggests industrial control (OT/ICS) infrastructure rather than a consumer device — though the healthcare registrations (B0:49:5F, 00:22:09) can also appear on connected blood-pressure monitors and similar devices.
- IEEE assignment (primary)
- 3C:F7:D1, 80:B5:C6 → OMRON Corporation, registered Kyoto, JP [Confirmed] — IEEE MA-L (enrichment/registries/oui.csv); corroborated maclookup.app / uic.io
- Registry / block sizes
- 5 MA-L (24-bit OUI, ~16.7M addresses each) + 1 MA-M (28-bit, OMRON SENTECH); 6 IEEE assignments total across the Omron group [Confirmed] — IEEE oui.csv + mam.csv (enrichment/registries/)
- HQ / country
- Shiokoji Horikawa, Shimogyo-ku, Kyoto 600-8530, Japan (registry address matches corporate HQ) [Confirmed] — IEEE MA-L; uic.io
- Company status
- active; publicly listed Japanese multinational electronics manufacturer (industrial automation, electronic components, healthcare devices, social infrastructure) [Confirmed] — en.wikipedia.org/wiki/Omron
- Founded
- 1933-05-10 [Confirmed] — en.wikipedia.org/wiki/Omron
- Verified prefixes — OMRON Corporation (MA-L)
- 3C:F7:D1, 80:B5:C6 [Confirmed] — IEEE MA-L (oui.csv)
- Verified prefixes — healthcare (MA-L)
- B0:49:5F (OMRON HEALTHCARE Co. Ltd.), 00:22:09 (Omron Healthcare Co. Ltd.) [Confirmed] — IEEE MA-L (oui.csv)
- Legacy / predecessor prefix (MA-L)
- 00:00:0A → "OMRON TATEISI ELECTRONICS CO." — the former corporate name; the company shifted to "Omron" branding (legacy block in the early 00:00:0x Ethernet range) [Confirmed assignment; the Tateisi→Omron renaming is the well-documented corporate history] — IEEE MA-L (oui.csv); Wikipedia
- Subsidiary prefix (MA-M)
- D4:7C:44:3x → OMRON SENTECH CO., LTD., Ebina-City, Kanagawa, JP [Confirmed] — IEEE MA-M (enrichment/registries/mam.csv)
- Device types
- PLCs and Machine Automation Controllers (CJ, CS, NJ, NX Sysmac series), industrial robots, sensors, HMIs, safety/motion controllers, relay/switch components, networked infrastructure (ticket gates, traffic controllers, access control); healthcare blocks → connected medical devices (e.g. blood-pressure monitors) [Confirmed] — en.wikipedia.org/wiki/Omron; softwaretoolbox.com
- Network protocols
- EtherNet/IP (CIP) on modern NJ/NX Sysmac controllers; legacy FINS-over-Ethernet on older CJ/CS/CP series [Confirmed] — softwaretoolbox.com; docs.roboticsware.com
- IEEE assignment date
- none published — IEEE's public OUI data (oui.csv columns: Registry, Assignment, Organization Name, Organization Address) carries NO assignment/registration date. Third-party "dates" surfaced for these prefixes (e.g. 2021-11-05 for 3C:F7:D1, 2026-02-11 for 80:B5:C6) are database-artifact scrape timestamps, NOT IEEE facts. [Confirmed] — IEEE oui.csv
- Security note (analyst, load-bearing)
- Omron's networked PLCs (NJ/NX Sysmac) are confirmed ICS/OT targets. CVE-2022-34151 (hardcoded credentials, CVSS 9.0) was weaponized by the Pipedream/Incontroller "BadOmen" component (HTTP-server interface on NX/NJ); related advisories cover CVE-2022-33971 and CVE-2022-33208. CISA has issued multiple Omron ICS advisories; Omron obtained IEC 62443-4-1 certification (March 2023). [Confirmed] — securityweek.com; cisa.gov ICS advisories ICSA-22-179-02 / ICSA-23-073-01; omron.com
- Related entities
- OMRON HEALTHCARE Co., Ltd. (healthcare devices); OMRON SENTECH CO., LTD. (machine-vision subsidiary)
- Analyst note
- An Omron OUI on a globally-administered address identifies genuine Omron hardware; the parent/legacy blocks most often mean industrial control (OT/ICS) gear, so treat such a MAC as a signal of PLC/controller infrastructure and review ICS exposure. The healthcare blocks instead point to connected medical devices.