Net Work Documentation

I’m looking for software that can help me keep track of the our Network. We are growing on a daily basis and need to keep track or our equiptment and software for obvious purposes. Any software that will allow me to document the number of the Servers, Routers, Switches, workstations, IP’s assigned, NerBIOS/Host names, etc., would be a savior. It would also be great if It will allow us to run query’s for reporting purposes. I have not really done much reasearch, but thought I would try here for a start point. Please Help.