This release notes document for ExtremeCloud™ IQ Classic version 25.4.3-40 outlines enhancements, resolved issues, supported devices, and known limitations across the platform. This release addresses issues with ExtremeCloud IQ displaying inconsistent data, audit logs displaying the userId instead of the username, and an issue with a missing icon. The document supports IQ Engine version 10.8.3a and includes extensive device compatibility matrices for controllers, access points, switches, routers, and third-party hardware. It provides detailed public IP address blocks for global data centers and firewall configurations. Known issues span UI inconsistencies, configuration push errors, and licensing anomalies. The guide is technically comprehensive, targeting IT professionals with advanced configuration needs, and includes supplemental CLI usage, and browser/display compatibility requirements.