You can either buy network monitoring software or you can download free network monitoring software available on various Web sites. Such free network monitoring software is of two types. One is completely free software. The other is shareware. Shareware is free for use by you for a limited period of time. Generally, this period is thirty days. Such limited duration free network monitoring software in certain cases may be made available to you by its developer with some features disabled. One such shareware product is Network Inventory Monitor.