Top 8 IP Address Management (IPAM) Tools
Device42Infoblox IPAMSolarWinds IPAMBT Diamond IPBlueCat Adaptive DNSManageEngine OpUtilsMen&Mice DDI SuiteInfoblox Network Insight
The pricing is reasonable.
The solution's automatic IT asset discovery and inventory functionality are top-notch. The thing I like is that it's open-source. If I need to change them — and they've given me links on GitHub to have them — I can go and change them to pull exactly what I want, as frequently as I want.