# Host Discovery ### **Before a SYN scan with wihtout arp ping:** ``` nmap -sn --disable-arp-ping ``` ### **Before a SYN scan with wihtout arp ping and with TCP packet with a SYN flag attached:** ``` nmap -sn -PS --disable-arp-ping ``` ### **Before a SYN scan with wihtout arp ping and with TCP packet with a ACK flag attached:** ``` nmap -sn -PA --disable-arp-ping ``` ### **Before a SYN scan with wihtout arp ping and with TCP packet with ICMP echo request:** ``` nmap -sn -PE --disable-arp-ping ``` ### **Send ICMP ech**o request packets an**d only display hosts that are alive:** ``` fping -A ``` **Send ICMP echo request packets and only display hosts that are alive and specify the number of retries (-r):** ``` fping -A -r ``` Specify a range of ip addresses such as a whole subnet (-g), send ICMP packets to every host in subnet, display time required to reach host (-e) and force fping to be quiet (-q): ``` fping -q -a -g -r 0 -e ``` --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://ejpt-certification.certs-study.com/ecpptv2-certified-professional-penetration-tester/commands-notes/host-discovery.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.