Microsoft IP Address Management Server is described as 'IP Address Management (IPAM) in Windows Server® 2012 is an integrated suite of tools to enable end-to-end planning, deploying, managing and monitoring of your IP address infrastructure, with a rich user experience' and is an app. There are more than 10 alternatives to Microsoft IP Address Management Server for a variety of platforms, including Linux, Web-based, Self-Hosted, SaaS and Windows apps. The best Microsoft IP Address Management Server alternative is NetBox, which is both free and Open Source. Other great apps like Microsoft IP Address Management Server are phpIPAM, SolarWinds IP Address Manager, Simple IP Config and TeemIP.
Simple IP Config manages changing IPs on a single host between presets. Microsoft IPAM is more documentation and management across an entire network.