[EricE]

Something like https://www.globalservices.bt.com/en/solutions/products/diam...

Used it at a previous org I worked for. Pretty nice - it can crawl your routers, build up your existing network allocations then help you analyze/optimize them.

Stupid powerful - we used it mostly for decentralized DNS management (!!) but after a while I finally got the network and security folks to realize what the system could do and the spreadsheets started to finally go away.

Speaking of decentralized management it has robust hierarchical role-based security - we had thousands of site admins managing DNS and eventually IP addresses for their individual sites, but also smoothly maintaining overall command-control. A very cool system.