This is an alternate way of viewing IPAM data. The currently viewed location in IP Addresses forms the the tree root level. You can change the view back to IP address list by selecting a IP block from the tree view or from the breadcrumb trail available at the top of the page, or by clicking IP Addresses in the navigation.

You can open and close individual branches with the icons containing + and - signs. You can also use the designated buttons for opening and closing all the tree branches at a time (this disables the individual branch open and close functions).

Address and bitmask, Type and Status columns are static and displayed always. Additional information field columns can be displayed for both hosts and blocks. The column contents are selected in the user's display preferences in Configuration / User accounts / User / IPAM / Information field displayed in tree view.