Network mapping for discover hosts and topology in a LAN. Is the previous step for tapping in the web or attack a host.
For view the hosts in company lan:
nmap -sL 10.0.0.0/8
Too much hosts, I try the next command for less hosts. This limits to the subhost 10.15.255.255(1+2+4+8) :
nmap -sL 10.0.0.0/12
Or in a personal LAN we could do:
nmap -sL 192.168.1.0/24
More options for host detection explained in nmap.org: