Seongji Industry Company holds two MA-L (24-bit OUI) blocks — 40:CA:63 and 88:57:1D — both registered to the same address at 54-33, Dongtanhana 1-gil, Hwaseong-si, Gyeonggi-do, KR 18423. The company is a South Korean industrial electronics manufacturer founded in 1986, now operating as SJIT Co., Ltd. after rebranding from "Seong Ji Industrial Co., Ltd." Its MAC-bearing products are wireless IoT modules: Wi-Fi HaLow / 802.11ah (WHM-series), Sigfox (SFM-series), LoRaWAN, UWB (UWM-series), audio transceivers (ATM-series), and GPS asset trackers (IET-series). It also manufactures touch-screen panels, wiring harnesses, and smart-home terminals such as digital door locks, wall pads, and video phones. These modules ship OEM/ODM/EMS only — they are embedded into host integrator products, not sold at retail. Seeing 40:CA:63 or 88:57:1D on a network therefore indicates a host device (IoT sensor, asset tracker, smart-home controller, or sub-GHz gateway) built around an SJIT module rather than a Seongji-branded consumer product. The company is a legitimate FCC grantee (2BEK7) with multiple certified products and is not associated with commodity consumer hardware or known threat actors; if encountered unexpectedly, identify the host integrator product, since SJIT modules are not deployed standalone.
- IEEE assignment
- 2 prefixes (40:CA:63, 88:57:1D) → Seongji Industry Company [Confirmed] — IEEE MA-L (enrichment/registries/oui.csv, lines 830 and 1512)
- Registry / block size
- MA-L (24-bit OUI), two blocks [Confirmed] — enrichment/registries/oui.csv. NOTE: IEEE's public OUI data publishes NO assignment/registration date; any "date registered" on third-party MAC-lookup tools (e.g. maclookup.app citing "July 2019") is a database artifact, not an IEEE fact. No IANA reference applies to OUI entries. Not present in mam.csv (MA-M) or oui36.csv (MA-S).
- Registered address / country
- 54-33, Dongtanhana 1-gil, Hwaseong-si, Gyeonggi-do, KR 18423; South Korea (KR) [Confirmed] — enrichment/registries/oui.csv
- Company
- Seongji Industry Company, now operating as SJIT Co., Ltd. (rebranded from "Seong Ji Industrial Co., Ltd."); South Korean electronics manufacturer founded 1986, HQ Hwaseong-si, Gyeonggi-do [Confirmed] — https://seongji.tradekorea.com/company.do, https://www.komachine.com/en/companies/seong-ji-industrial
- Company status
- active; vendor site and FCC filings current as of 2025 [Confirmed] — https://www.fccinsights.com/sjit-coltd, https://fccid.io/2BEK7WHM200A
- Device types
- IoT wireless modules — Wi-Fi HaLow/802.11ah (WHM-series), Sigfox (SFM-series), LoRaWAN, UWB (UWM-series), audio transceivers (ATM-series), GPS asset trackers (IET-series); also touch-screen panels, interface boards/PBAs, wiring harnesses, smart-home terminals (digital door locks, wall pads, video phones, interphones), ESS/EV charging cables [Confirmed] — https://www.komachine.com/en/companies/seong-ji-industrial, https://github.com/Support-SJI/WiFi_Halow, https://fccid.io/2BEK7WHM200A
- Distribution model
- OEM/ODM/EMS only — modules embedded into host integrator products, not sold retail [Confirmed] — https://fccid.io/2BEK7WHM200A (FCC "OEM installation only"), https://www.komachine.com/en/companies/seong-ji-industrial
- Industry partnerships
- STMicroelectronics partner; Sigfox partner network; FCC grantee 2BEK7 with multiple certified products [Confirmed] — https://www.st.com/content/st_com/en/partner/partner-program/partnerpage/sjit.html, https://partners.sigfox.com/companies/wisol-co-ltd, https://www.fccinsights.com/sjit-coltd
- Security context
- No CVEs, NVD entries, or CISA advisories found for Seongji/SJIT products as of June 2026. WHM-series Wi-Fi HaLow modules are FCC-certified "OEM installation only" (host integrator handles end-user isolation). Modules span Sigfox/LoRa/BLE/Wi-Fi HaLow/UWB/Zigbee — a broad multi-protocol wireless surface; standard IoT supply-chain caution applies if this OUI appears unexpectedly on an enterprise/OT network. Smart-home products (door locks, wall pads) imply physical-security integration. [Likely] — https://nvd.nist.gov (searched, no results), https://fccid.io/2BEK7WHM200A
- Website
- https://seongji.co.kr (primary); https://github.com/Support-SJI (module firmware support) [Likely] — https://www.fccinsights.com/sjit-coltd, https://github.com/Support-SJI/WiFi_Halow
- Allocated date
- Unknown — IEEE publishes no OUI registration date; not an ASN/RIR resource, so no first-party RDAP date applies; the "July 2019" third-party artifact is not recorded [Unknown] — enrichment/registries/oui.csv
- Analyst note
- Seeing 40:CA:63 or 88:57:1D on a network indicates an OEM/ODM-integrated SJIT wireless module embedded in a host device (IoT sensor, asset tracker, smart-home controller, or sub-GHz gateway), not a standalone consumer product. Identify the host integrator product if encountered unexpectedly. [Confirmed]