Final answer:
The command in nmap that is used to determine if a host or range of hosts are live without port scanning is nmap -sn.
Step-by-step explanation:
The command in nmap that is used to determine if a host or range of hosts are live without port scanning is nmap -sn. The -sn option stands for ping scan, which sends ICMP Echo Requests to the target hosts and waits for a response. If a response is received, it indicates that the host is live.
This command is commonly used to quickly check the availability of hosts on a network before performing a more thorough port scan. It can also be useful for mapping out active hosts in a large network.
For example, to check if a range of hosts from 192.168.0.1 to 192.168.0.10 are live, you can use the command nmap -sn 192.168.0.1-10.