The IEEE registry lists 16 MA-L blocks under the organization name "OHSUNG," all carrying a Gumi, Gyeongsangbuk-do, South Korea address (most read "335-4, Sanhodaero, Gumi, Gyeong Buk, KR 730-030"; two older blocks show a shorter "181, Gumi, Kyungbuk" form). These registrations belong to Ohsung Electronics Co., Ltd., a South Korean manufacturer founded in 1974 whose principal business is infrared and RF remote controllers — set-top box, smart-TV, and home-automation remotes, including reference-design remotes co-developed for the Google Android TV platform. Ohsung also produces smart-home IoT hardware (PIR and door/window sensors, sirens, monitoring cameras, environmental sensors, smart thermostats) and wireless modules spanning Wi-Fi (802.11 b/g/n, 2.4 GHz), Bluetooth/BLE, and Zigbee. The company files FCC equipment authorizations under grantee code OZ5, with roughly 154 applications since 2000. For a network operator, an Ohsung OUI on a LAN most likely indicates a consumer AV/STB remote, a smart-home hub, or a home-automation sensor or camera — low inherent enterprise threat, though IoT cameras and sensors warrant VLAN segmentation as a general best practice. No vendor-specific CVEs were found; class-level risks apply to Ohsung's Zigbee and IR-controlled devices. As with all OUI data, IEEE publishes no registration date for these blocks, so any third-party "date registered" is a database artifact rather than an IEEE fact.
- IEEE assignment
- 16 prefixes → "OHSUNG," registered Gumi, Gyeongsangbuk-do, KR [Confirmed] — IEEE MA-L (enrichment/registries/oui.csv, 16 matching rows, all MA-L)
- Registry / block size
- MA-L (24-bit OUI); 16 IEEE prefixes [Confirmed] — IEEE oui.csv; no MA-M or MA-S assignments found
- Verified prefixes (all MA-L, OHSUNG)
- 14CF8D, 1C3929, 309E1D, 343E25, 4892C1, 68966A, 749EA5, 98EF9B, 98F5A9, B814DB, C8DD6A, D01B1F, D4FF26, E8DF24, F4832C, F4AAD0 [Confirmed] — IEEE oui.csv
- Registry address
- 335-4, Sanhodaero, Gumi, Gyeong Buk, KR 730-030 (primary on most blocks; two older blocks show "181, Gumi, Kyungbuk, KR 730-030") [Confirmed] — IEEE oui.csv
- Country
- South Korea (KR) [Confirmed] — IEEE oui.csv
- Company / legal entity
- Ohsung Electronics Co., Ltd. — headquartered in Busan; manufacturing in Gumi (matching the registry address), with additional production in China, Indonesia, and Mexico [Confirmed] — ohsunghq.com, ohsungec.tradekorea.com
- Founded
- 1974 (primary vendor site dates the Homenet/Gumi-factory business to April 1974; tradekorea also states 1974; Tracxn lists 1983 — likely an entity-vs-parent-group discrepancy; 1974 is the first-party figure) [Likely] — ohsunghq.com (primary), tracxn.com (conflicting)
- Company status
- active [Confirmed] — ohsunghq.com
- Device types
- IR/RF remote controllers (set-top box, smart TV, home automation, Android TV reference designs); smart-home IoT (PIR/door/window sensors, sirens, cameras, environmental sensors, thermostats); wireless modules (Wi-Fi 802.11 b/g/n 2.4 GHz, Bluetooth/BLE, Zigbee, Wi-Fi+BLE combo, RFID readers) [Confirmed] — fccid.io/OZ5, ohsunghq.com, tracxn.com
- Primary use context
- consumer-electronics remote controls and smart-home/home-automation devices, often OEM-embedded into third-party platforms (e.g., modular Wi-Fi module OZ5-S904-SD-WF, FCC-approved Jan 2021, for downstream OEM integration) [Confirmed] — fccid.io/OZ5-S904-SD-WF, fccid.io/OZ5
- FCC grantee code
- OZ5 (~154 filings, 2000–2026) [Confirmed] — fccid.io/OZ5
- IEEE registration date
- NONE published. IEEE public OUI data (oui.csv: Registry, Assignment, Organization Name, Organization Address) carries no assignment/registration date; any third-party "date registered" is a database artifact, not an IEEE fact. [Confirmed] — IEEE oui.csv
- Security context
- No vendor-specific CVEs or public advisories found for Ohsung Electronics as of June 2026. Class-level risks apply: Zigbee devices share well-documented protocol weaknesses (symmetric-key compromise, key-sniffing during pairing, jamming); IR remotes have a known eavesdropping/replay surface when controlling sensitive IoT functions; OEM-embedded Wi-Fi modules inherit the host firmware's posture. [Confirmed for absence of Ohsung-specific CVE; class risks Confirmed generically] — exploitsecurity.io (Zigbee), ncbi.nlm.nih.gov/PMC8706134, fccid.io/OZ5-S904-SD-WF
- Website
- https://www.ohsunghq.com (group/parent site, English pages); https://www.ohsungec.com (subsidiary site; TLS errors observed during fetch) [Confirmed] — ohsunghq.com
- Data trap / disambiguation
- Two distinct "Ohsung" entities exist in South Korea — Ohsung Electronics Co., Ltd. (Busan; the remote/home-automation maker covered here) and a separate smaller "Ohsung Co., Ltd." in Changwon. The MA-L OUI vendor is Ohsung Electronics, given its extensive FCC wireless portfolio. Also exclude OUI 00:03:2A (UniData Communication Systems, Inc.), which references an unrelated "OhSung-Bldg" Korean address but is a different legal entity. [Confirmed] — IEEE oui.csv, fccid.io/OZ5
- Analyst note
- An Ohsung OUI on a LAN most likely identifies a consumer AV/STB remote, smart-home hub, or home-automation sensor/camera. Low inherent enterprise-network threat; segment IoT cameras/sensors onto a dedicated VLAN per general best practice.