I manage hundreds of servers at work. They each have a BMC (remote power on/off, reset, KVM, etc) and we need to use those features frequently. I've been using a Google Docs spreadsheet to track their URLs, what each box is used for, specs, etc but it feels like a dynamic web app would be better for this purpose. Does anyone use anything like this? Did you make your own?
Check out NetBox. It is a free open source datacenter inventory management and IP address management tool. It will let you catalog all of your physical assets along with the network assignments.
+1 for netbox.
Administrating a bunch of network devices and/or servers, etc.... Netbox is the way.