Embodiments relate to systems and methods for generating cached representations of host package inventories in remote package repositories. A physical or virtual client machine can host a set of installed software packages, including operating system, application, and/or other software. A package manager installed on the client reports an inventory of the installed packages to one or more package servers. The package server(s) can receive the inventory from machines populating the managed network, and generate an encoded identification for each constituent package, such as a hash-based output based on package attributes. The encoded identification and other data can be stored to an aggregate package cache in the one or more package servers, for more efficient management of the host machines in the managed network. In embodiments, the package update files for each identifier can also be stored in the cache for even more efficient inventorying and package update operations.