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To scan a range of 1,000 IP addresses to find live hosts using nmap, you can use the following command:
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nmap -sP <range of IP addresses> -oG - | grep "Status: Up"
This command uses the -sP option, which tells nmap to perform a ping scan, the <range of IP addresses> is where you should insert the range of IPs that you want to scan, for example:
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nmap -sP 192.168.1.1-1000 -oG - | grep "Status: Up"
This command will scan the IP addresses from 192.168.1.1 to 192.168.1.1000 and the last part of the command "grep "Status: Up"" will only show the results of the hosts that are Up.
This is a faster and less invasive way of checking which hosts are live, but keep in mind that it might take a while to scan 1k IPs, and it might cause some impact on the network and on the hosts themselves. Therefore, it's recommended to coordinate with network administrators and get proper authorization before performing the scan. Also, like any other scan, without prior authorization, it can be considered as an unauthorized access and it's illegal in some jurisdictions.
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