Full list of builtin roster modules

ansible Read in an Ansible inventory file or script
cache Use the minion cache on the master to derive IP addresses based on minion ID.
cloud Use the cloud cache on the master to derive IPv4 addresses based on minion ID.
clustershell This roster resolves hostname in a pdsh/clustershell style.
flat Read in the roster from a flat file using the renderer system
range This roster resolves targets from a range server.
scan Scan a netmask or ipaddr for open ssh ports