Nmap

Nmap is a free, open-source network mapper widely used for security auditing and inventorying. Device auto discovery and color-coded icons (via interfaces) provide visibility. Compliance and hierarchical mapping may require scripts; location-based and self-updating maps are supported by add-ons. On-demand mapping, reporting, and analytics are customizable. Nmap’s flexibility and zero-cost approach make it a go-to tool for network scanning and security professionals.