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+# NMAP Cheat Sheet
+
+Base nmap Syntax:
+
+```
+nmap [ScanType] [Options] {targets}
+```
+If no port range is specified, Nmap scans the 1,000 most popular ports.
+
+```
+-F Scan 100 most popular ports
+-p <port1>-<port2> Port range
+-p <port1>,<port2>,... Port List
+-pU:53,U:110,T20-445 Mix TCP and UDP
+-r Scan linearly (do not randomize ports)
+--top-ports <n> Scan n most popular ports
+-p-65535 Leaving off initial port in range makes Nmap scan start at port 1
+-p0- Leaving off end port in range makes Nmap scan through p
+```
+
+## Nmap Scripting Engine
+
+The full list of Nmap Scripting Engine scripts: http://nmap.org/nsedoc/
+
+Some particularly useful scripts include:
+
+- dns-zone-transfer: Attempts to pull a zone file (AXFR) from a DNS server.
+```
+$ nmap --script dns-zonetransfer.nse --script-args dns-zonetransfer.domain=<domain> -p53 <hosts>
+```
+
+- http-robots.txt: Harvests robots.txt files from discovered web servers.
+```
+$ nmap --script http-robots.txt <hosts>
+```
+
+- smb-brute: Attempts to determine valid username and password combinations via automated guessing.
+```
+$ nmap --script smb-brute.nse -p445 <hosts>
+```
+
+- smb-psexec: Attempts to run a series of programs on the target machine, using credentials provided as scriptargs.
+```
+$ nmap --script smb-psexec.nse –script-args=smbuser=<username>,smbpass=<password>[,config=<config>] -p445 <hosts>
+```
+
+### Nmap Scripting Engine Categories
+The most common Nmap scripting engine categories:
+- auth: Utilize credentials or bypass authentication on target hosts.
+- broadcast: Discover hosts not included on command line by broadcasting on local network.
+- brute: Attempt to guess passwords on target systems, for a variety of protocols, including http, SNMP, IAX, MySQL, VNC, etc.
+- default: Scripts run automatically when -sC or -A are used.
+- discovery: Try to learn more information about target hosts through public sources of information, SNMP, directory services, and more.
+- dos: May cause denial of service conditions in target hosts.
+- exploit: Attempt to exploit target systems.
+- external: Interact with third-party systems not included in target list.
+- fuzzer: Send unexpected input in network protocol fields.
+- intrusive: May crash target, consume excessive resources, or otherwise impact target machines in a malicious fashion.
+- malware: Look for signs of malware infection on the target hosts.
+- safe: Designed not to impact target in a negative fashion.
+- version: Measure the version of software or protocols on the target hosts.
+- vul: Measure whether target systems have a known vulnerability.