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Subnetlens is a local-first Windows desktop application developed by HELIOSOFT LTD for LAN discovery, network mapping, and IT troubleshooting, currently available in version 1.1.1 as the latest of five released versions. Positioned in the network administration and IT utility category, it is designed for IT administrators, small businesses, managed service providers, and home-lab users who need visibility into what is connected to their network without deploying a cloud service or server stack. The software scans and classifies devices, builds an interactive topology map, tracks open ports and service history on a per-device basis, and listens for mDNS and SSDP device activity in real time. It also bundles 26 built-in IT tools, including ping, traceroute, DNS lookup, port scan, WHOIS, GeoIP, TLS checks, and HTTP header inspection, making it useful for day-to-day diagnostics as well as inventory work. The free tier covers single-subnet network scanning, topology mapping, device inventory, and the core diagnostic toolset. For more advanced needs, Subnetlens Pro, offered as a one-time purchase, adds Radar monitoring, Prometheus metrics, scheduled scans, risk scoring, HTML reports, IP address management, webhooks, an encrypted credential vault, SNMP topology, an embedded terminal, and multi-network profiles. Because the application follows a local-first model, all scan data remains on the user's machine unless explicitly exported, which suits environments with strict privacy or compliance requirements. The Windows installer is code-signed by HELIOSOFT LTD and contains no adware, bundles, or third-party offers, providing a clean installation experience. Typical use cases range from auditing an office network and documenting connected devices to troubleshooting connectivity issues, monitoring service availability, and maintaining an accurate record of port exposure over time across one or multiple managed networks.
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