Laplace System Co., Ltd. holds the MA-L OUI block 04:EE:EE, registered to its Kyoto headquarters at 1-245 Kyo-machi, Fushimi-ku, Kyoto, Japan. Founded in June 1990, the company is a renewable-energy monitoring specialist that ships both software and embedded hardware for photovoltaic (PV) and wind power generation. The networked devices most likely to surface this OUI are the Solar Link ZERO series (T3/T4/T5) — compact ARM-based (quad-core Cortex-A72) data-logger and controller units that carry Gigabit Ethernet (10/100/1000BASE-T, RJ-45), IEEE 802.11 b/g/n Wi-Fi in access-point mode, RS-485 for local PV-inverter communication, an optional LTE module, and HDMI output. These units both monitor and perform output control for PV inverters, placing them in the industrial/OT (ICS-adjacent) class rather than general IT networking equipment. The vendor reports top PV-monitoring market share in Japan, with roughly 83,000 installed sites and 20.2 GW under management as of March 2024. No public CVEs or CISA ICS-CERT advisories were found for Laplace System products as of June 2026, though absence of advisories may reflect limited public security research on the product rather than confirmed absence of risk. As with all MA-L blocks, IEEE publishes no assignment date, so no registration date is recorded here.
- IEEE assignment
- 04:EE:EE → Laplace System Co., Ltd. [Confirmed] — enrichment/registries/oui.csv line 945 (IEEE MA-L)
- Registry / block size
- MA-L (24-bit OUI) [Confirmed] — IEEE oui.csv. Not present in mam.csv (MA-M) or oui36.csv (MA-S). NOTE: IEEE public OUI data publishes NO assignment/registration date; any third-party "date registered" is a database artifact, not an IEEE fact.
- HQ / country
- 1-245 Kyo-machi, Fushimi-ku, Kyoto 6128083, Japan [Confirmed] — IEEE MA-L registry address; corroborated by company site https://www.lapsys.co.jp/en/company/details/index.html
- Company status
- active; founded June 1990 [Confirmed] — https://www.lapsys.co.jp/en/company/details/index.html
- Device types
- Solar Link ZERO series (T3/T4/T5) embedded data-logger/controller units; L-eye remote monitoring packages; Solar Link Viewer display systems [Confirmed] — https://www.lapsys.co.jp/en/products/zero/spec.html, https://www.lapsys.co.jp/en/solution/monitoring/index.html
- Device category
- Industrial/OT — solar power data logger / monitoring controller (ICS-adjacent; not general IT networking gear) [Confirmed] — https://www.lapsys.co.jp/en/products/zero/spec.html
- Network interfaces
- Gigabit Ethernet (10BASE-T/100BASE-TX/1000BASE-T, RJ-45); IEEE 802.11 b/g/n Wi-Fi (AP mode only); optional LTE module; RS-485 for local PV-inverter comms (not Ethernet) [Confirmed] — https://www.lapsys.co.jp/en/products/zero/spec.html
- Hardware platform
- quad-core ARM Cortex-A72 SoC; HDMI output [Confirmed] — https://www.lapsys.co.jp/en/products/zero/spec.html
- OUI registration date
- Unknown — IEEE does not publish OUI registration dates; no third-party source corroborated a specific date with a citable URL [Unknown]
- Security context
- No public CVEs, CISA ICS-CERT advisories, or disclosed vulnerabilities found for Laplace System / lapsys.co.jp products as of June 2026 [Likely] — https://www.cisa.gov/news-events/ics-advisories (no matching advisory). The Solar Link ZERO is an internet-connected OT/ICS-adjacent device that performs PV-inverter output control, placing it in a security-sensitive (grid-edge) class; absence of CVEs may reflect limited public research, not confirmed absence of risk.
- Market position
- reported top PV-monitoring share in Japan; ~83,000 monitoring sites, 20.2 GW under management (end of March 2024); US subsidiary Laplace Systems, Inc. established 2014 [Likely] — https://www.lapsys.co.jp/en/solution/monitoring/index.html, https://www.zoominfo.com/c/laplace-systems-inc/1103572340
- Website
- https://www.lapsys.co.jp/english/ (JP); US subsidiary laplacesystems.com [Confirmed] — https://www.lapsys.co.jp/english/
- Analyst note
- A 04:EE:EE address most likely identifies a Solar Link ZERO data-logger/controller deployed at a PV site. Because these are output-control devices on the energy grid edge, presence of this OUI on a network is a useful signal for OT/ICS asset inventory.