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NMAP Commands Cheat Sheet and Tutorial with Examples (Download PDF) Edited By Harris Andrea. NMAP (Network Mapper) is the de facto open source network scanner used by almost all security professionals to enumerate open ports and find live hosts in a network (and much more really).
nmap -sX <ip address> (Xmas scan: sends FIN, URG and PUSH flags, read books for more info!) nmap -sA <ip address> (ACK scan: to be used in conjunction with other scans to detect firewall rules) These scans don’t tend to work on windows targets.
Inspect Top 100 TCP and UDP ports for free or get a paid plan to automate and schedule extensive custom scans for even more ports. Each Nmap port scan against a target IP address or hostname automatically maps the attack surface and gives accurate data for your reconnaissance work.
Identify open ports: Nmap conducts port scanning of target hosts. OS version detection: discover the operating system (OS) and version of a target system quickly. We’ve covered all of the commands you need to know, alongside their use cases below.
Basics - Target Syntax. Everything that isn’t an option is considered a host :-) Hostname: nmap scanme.nmap.org. IP-Address: nmap 45.33.32.156. CIDR-ish notation: nmap 45.33.32.156/32. nmap scanme.nmap.org/32. NOT nmap 45.33.32.156/255.255.255.255.
Examples and diagrams show actual communication on the wire. Topics include subverting firewalls and intrusion detection systems, optimizing Nmap performance, and automating common networking tasks with the Nmap Scripting Engine. More than half of the book is available free online.
Example: nmap -sn -PS21 <Target-ip> Best two example commands for Host Discovery. 1. nmap -sn -T4 -PS21,22,25,80,445,3389,8080 -PU137,138 10.0.2.0/24. 2. nmap -sn -T4 10.0.2.0/24. Port Scanning. After we knew the up hosts we must skip the host discovery phase by adding this switch: nmap -Pn <target-ip>
