Follow these steps for scanning hosts with Nmap:

1. The most common use of Nmap is to find all the hosts online within a given IP range. The default command used takes some time to scan the complete network, depending on the number of hosts in the network.
2. The following screenshot shows an example:
   

3. To perform a SYN scan on a particular IP from a subnet, use the following command:
   
4. If SYN scan does not work properly, you can also use Stealth scan:
   

5. To detect the version number of the services running on the remote host, you can perform Service Version Detection scan as follows:
   
6. If you want to detect the operating system running on the remote host, run the following command:

nmap -O 192.168.1.102

7. The output here has been truncated:
   
8. If you wish to scan only for a particular port, such as 80, run the command: