Before we scan the live targets, we need to specify them. Generally, we provide a list, a range, or a subnet. Examples of target specification are:
10.11.12.15 scanme.nmap.org example.com
nmap -sL -n 10.10.0-255.101-125
nmap -iL list_of_hosts.txt
nmap -sL list_of_hosts.txt will give a detailed lists of hosts to scan without actually scanning them with reverse-DNS resolution on all targets to obtain their names (unless blocked with -n).
nmap -sL list_of_hosts.txt