This option skips the Nmap discovery stage altogether. Normally, Nmap uses this stage to determine active machines for heavier scanning. By default
Nmap only performs heavy probing such as port scans, version detection or OS detection against hosts that are found to be up.
Disabling host discovery with -Pn causes Nmap to attempt the requested scanning functions against every target IP address specified. So if a class B target address space (/16) is specified on the command line, all 65,536 IP addresses are scanned. Proper host discovery is skipped as with the list scan, but instead of stopping and printing the target list, Nmap continues to perform requested functions as if each target IP is active. To skip ping scan and port scan, while still allowing NSE to run, use the two options -Pn -sn together.
For machines on a local ethernet network, ARP scanning will still be performed (unless --disable-arp-ping or --send-ip is specified) because Nmap needs MAC addresses to further scan target hosts.
In previous versions of Nmap, -Pn was -P0 and -PN.
This option skips the Nmap discovery stage altogether. Normally, Nmap uses this stage to determine active machines for heavier scanning. By default
Nmap only performs heavy probing such as port scans, version detection or OS detection against hosts that are found to be up.
Disabling host discovery with -Pn causes Nmap to attempt the requested scanning functions against every target IP address specified. So if a class B target address space (/16) is specified on the command line, all 65,536 IP addresses are scanned. Proper host discovery is skipped as with the list scan, but instead of stopping and printing the target list, Nmap continues to perform requested functions as if each target IP is active. To skip ping scan and port scan, while still allowing NSE to run, use the two options -Pn -sn together.
For machines on a local ethernet network, ARP scanning will still be performed (unless --disable-arp-ping or --send-ip is specified) because Nmap needs MAC addresses to further scan target hosts.
In previous versions of Nmap, -Pn was -P0 and -PN.
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