KMS is a Key Management Service activation tool that enables Windows systems and Office to be activated using slmgr commands against a KMS server.
The tool solves the problem of activating Windows and Office installations by providing a KMS server endpoint that clients can connect to via the standard slmgr command-line utility. The activation process involves three steps executed with administrator privileges: setting the KMS server address using slmgr -skms, installing the appropriate product key for the Windows or Office version using slmgr -ipk, and then activating the system using slmgr -ato. The service can be tested for availability using telnet or tcping on port 1688.
The project maintains a curated list of KMS client activation keys for multiple Windows versions, including Windows Server editions from 2016 through 2025, Windows 10 and 11 variants across different release channels and editions, and legacy LTSC and LTSB versions. This makes it useful for administrators managing multiple Windows installations who need a centralized activation service. The README references the official Microsoft documentation for KMS client activation keys and points to vlmcsd as the underlying KMS server implementation that can be deployed.
The project consists primarily of HTML and documentation. Development activity shows consistent maintenance of the service endpoint and documentation updates to reflect new Windows versions as they are released. The tool is straightforward in scope, focusing on providing reliable KMS activation infrastructure and maintaining accurate product key references rather than adding novel functionality to the activation process itself.
