SMK consolidates two IEEE MA-L blocks under a single vendor entry: 7C:31:80, registered to "SMK corporation" at 6-5-5 Togoshi, Shinagawa, Tokyo 142-8511, Japan (the corporate HQ), and 00:01:90, registered to "SMK-M" at 1055 Tierra Del Rey, Chula Vista, CA 91910, US — the historical address tied to SMK Electronics Corporation USA, the company's American subsidiary. SMK Corporation (Tokyo Stock Exchange: 6798) is a Japanese electronics-component maker founded April 3, 1925, building connectors, switches, remote-control units, touch panels, and wireless communication modules. The practical OUI caveat is that SMK is a B2B component and module supplier, not a consumer device brand: a 7C:31:80 or 00:01:90 address on a network typically belongs to an SMK-made wireless module or remote control embedded inside an OEM customer's product — a smart TV, air conditioner, key fob, or IoT gateway — rather than a standalone SMK-branded device. SMK's module line spans Bluetooth (Classic, dual-mode, BLE), Sigfox 920 MHz, LoRaWAN-compatible tracking, and ultra-low-power BLE built on the Atmosic M2/M3 energy-harvesting SoC. The security posture of any host bearing these prefixes therefore depends on the OEM's firmware, not on SMK directly; no CVEs or security advisories specific to SMK Corporation were found in this pass.
- IEEE assignment
- 2 prefixes → SMK (7C:31:80 to "SMK corporation", Tokyo JP; 00:01:90 to "SMK-M", Chula Vista CA US) [Confirmed] — IEEE MA-L (enrichment/registries/oui.csv rows 152, 37497)
- Registry / block size
- both MA-L (24-bit OUI, 2^24 addresses each); no MA-M (mam.csv) or MA-S (oui36.csv) hits [Confirmed] — IEEE registry CSVs (enrichment/registries/oui.csv, mam.csv, oui36.csv). NOTE: IEEE's public OUI data publishes NO assignment/registration date (columns are only Registry, Assignment, Organization Name, Organization Address); any "date registered" on third-party tools is a database artifact, not an IEEE fact.
- HQ / country
- 6-5-5 Togoshi, Shinagawa-ku, Tokyo 142-8511, JP (parent, 7C:31:80 registry address) [Confirmed] — IEEE MA-L / https://www.smk.co.jp/en/company/overview
- US subsidiary address
- 1055 Tierra Del Rey, Chula Vista, CA 91910, US (00:01:90 "SMK-M" registry address; SMK Electronics Corporation USA, adjacent to the San Diego metro) [Confirmed] — IEEE MA-L / https://www.smkusa.com/en/about-smk-usa
- Company status
- active; Tokyo Stock Exchange ticker 6798; founded April 3, 1925; consolidated sales 48,051M JPY FY2024, ~3,985 employees [Confirmed] — https://www.smk.co.jp/en/company/overview, https://nz.finance.yahoo.com/quote/6798.T/profile/
- Device types
- B2B components/modules — connectors, switches, remote-control units, touch panels, and wireless modules (Bluetooth Classic/dual-mode/BLE, Sigfox 920 MHz, LoRaWAN-compatible tracking, Atmosic M2/M3 ultra-low-power BLE) [Confirmed] — https://www.smk.co.jp/en/products/lineup/iot/communication-module, https://partners.sigfox.com/companies/smk-corporation
- Notable products
- BT401 Bluetooth SPP series; WF923/WF931/WF941 Sigfox modules (Japan RC3); Atmosic M3-based IoT modules; RF remote controls for TVs, air conditioners, and automotive smart keys [Confirmed] — https://www.smk.co.jp/en/products/lineup/iot/communication-module, https://www.businesswire.com/news/home/20200902005159/en/Atmosic-Technologies-and-SMK-Electronics-Partner-Together-to-Bring-Forever-Battery-Life-to-IoT-Devices
- Verified prefixes (both MA-L)
- 7C:31:80 (SMK corporation), 00:01:90 (SMK-M) [Confirmed] — IEEE MA-L (enrichment/registries/oui.csv)
- Security context
- No CVEs, CISA KEV, or NVD entries specific to SMK Corporation found this pass. SMK's footprint is as an embedded module supplier; the host device is the OEM's product. Atmosic M3 BLE modules carry the standard BLE attack surface (pairing weaknesses, BlueBorne class) but no SMK-specific advisory exists. [Likely — single research pass, no advisory database confirms a clean record] — https://www.cvedetails.com/
- Related entities
- SMK Electronics Corporation USA (subsidiary, est. 1973; manufacturing in Tijuana, Mexico; US sales offices in San Diego, San Jose, White Plains, Detroit) — registry "SMK-M" on 00:01:90 [Confirmed] — https://www.smkusa.com/en/about-smk-usa
- Analyst note
- A 7C:31:80 or 00:01:90 address identifies an SMK-made module/remote embedded in an OEM product, not a standalone SMK device. Use it to attribute the network interface, not to identify the host appliance; security depends on the OEM firmware.