IPAM for iTop is the module / extension version of TeemIp that can be integrated on an existing iTop instance. It only provides the core IP management features embbeded in TeemIp standalone. Other features are available for iTop through extensions.
In any case, check the obsolescence status of your iTop version here below.
This IPAM for iTop extension is available through iTop Hub and can be automatically downloaded and deployed from there. Note that iTop Hub may not be up to date with the latest TeemIp version.
Comprehensive documentation can be found on this wiki, namely in the chapter Core features.
Here is the obsolescence status of the different iTop releases.
You may refer to iTop's Community Releases on iTop's Hub to find out the support status of a given iTop version.