NMAP

Nmap

Nmap is a port scanner developped in the mid-nineties by Gordon Lyon . It is used during the initial enumeration phase to scan for all ports on target machines, and incorporates a wide range of options for all our needs, be they service/version detection, specific port scanning behaviour, an integrated script engine, etc . See the example below :

nmap -A -sC -sV -p 21,22,65000 -oA target 10.10.110.100

It runs nmap and specifies the following options ; -A for OS detection, version detection, script scanning, and traceroute -sC to run the nmap default scripts -sV for service/version informations -p [list of ports] to scan the specified ports -oA target to write the output of this scan in the three major formats at once (.xml, .nmap, and .gnmap)

The output looks like this ;

In this example, we notice an FTP server running on port 21, and a WordPress server on port 65000.