SJIT Co., Ltd. — 5 prefixes (MA-L)

A MAC address beginning with 34:FC:99, 34:55:E5, 1C:E8:9E, 28:6B:B4, or 2C:E7:A7 belongs to SJIT Co., Ltd., a South Korean manufacturer of Wi-Fi HaLow (802.11ah), Sigfox, and LoRaWAN wireless modules built into IoT gateways, asset trackers, and smart-building terminals.

SJIT is based in Hwaseong-si, Gyeonggi-do and holds five IEEE MA-L blocks under the registrant name "SJIT Co., Ltd." (one row records it simply as "SJIT"). Its FCC-certified module line includes the WHM200A, WHM320A, and WHM500A Wi-Fi HaLow modules, alongside Sigfox and BLE/Zigbee/Z-Wave/UWB/GPS parts — OEM components integrators embed rather than retail products end users buy directly.

Company history points to an earlier identity: SJIT appears to be a rebrand of Seong Ji Industrial Co., Ltd. (founded 1985 or 1986, sources disagree). A separate vendor, "Seongji Industry Company," is registered at the same address with two other OUIs (40:CA:63, 88:57:1D). The two registrant names hold entirely disjoint blocks, so they are recorded as distinct, cross-linked vendors rather than merged.

No IEEE-published assignment date exists for any of these five prefixes; IEEE's OUI registry carries no date column, so any "date registered" surfaced by third-party MAC lookup tools is a database artifact, not an IEEE fact, and must not be recorded as one. No CVEs, threat-intel reports, or blacklist entries turned up for SJIT or any of its prefixes.

IEEE assignment

5 prefixes → SJIT Co., Ltd., registered Hwaseong-si, Gyeonggi-do, KR [Confirmed] — IEEE the IEEE MA-L registry

Registry / block size

MA-L (24-bit OUI); 5 IEEE prefixes, all in the IEEE MA-L registry (none in the IEEE MA-M registry/oui36.csv) [Confirmed] — IEEE the IEEE MA-L registry, the IEEE MA-M registry, the IEEE MA-S registry

HQ / country

54-33 Dongtanhana 1-gil, Hwaseong-si, Gyeonggi-do, KR 18423 [Confirmed] — IEEE MA-L registry

Company status

active [Likely] — https://www.fccinsights.com/sjit-coltd, https://www.st.com/content/st_com/en/partner/partner-program/partnerpage/sjit.html (no dissolution/closure signal found)

Device types

Wi-Fi HaLow/802.11ah modules, Sigfox, LoRaWAN, UWB, BLE/Zigbee/Z-Wave, GPS asset trackers [Confirmed] — https://fccid.io/2BEK7WHM200A, https://device.report/sjit/whm200a, https://manuals.plus/sjit/whm320a-wi-fi-halow-module-manual

Notable products

WHM200A, WHM320A, WHM500A Wi-Fi HaLow modules [Confirmed] — https://fccid.io/2BEK7WHM200A

Verified sample prefixes

34:FC:99, 34:55:E5, 1C:E8:9E, 28:6B:B4, 2C:E7:A7 [Confirmed] — IEEE the IEEE MA-L registry

Company history

apparent rebrand of Seong Ji Industrial Co., Ltd. (founded 1985 or 1986, sources disagree) [Likely] — https://www.fccinsights.com/sjit-coltd

Industry partnerships

STMicroelectronics partner program; Sigfox partner network; FCC grantee code 2BEK7 [Confirmed] — https://www.st.com/content/st_com/en/partner/partner-program/partnerpage/sjit.html, https://partners.sigfox.com/companies/wisol-co-ltd, https://fcc.report/company/Sjit-Co-L-T-D

Related vendor

"Seongji Industry Company" holds two separate MA-L blocks (40:CA:63, 88:57:1D) at this same registered address and is very likely the predecessor identity. The two registrant names hold disjoint prefix sets, so each stands as its own vendor entry and the pair is cross-linked rather than merged [Confirmed re: disjoint blocks; Likely re: rebrand lineage] — IEEE the IEEE MA-L registry

Security context

no CVEs, disclosures, or blacklist entries found for SJIT or its five prefixes [Unknown] — no source (absence of findings, not confirmed clean)

Registration date

Unknown — the IEEE OUI registry publishes no assignment date; third-party "date registered" values are database artifacts, not IEEE facts [Confirmed] — IEEE the IEEE MA-L registry