Nmap: Network Exploration and Security Auditing Cookbook - Second Edition

How to do it...

To launch a default scan, the bare minimum you need is a target. A target can be an IP address, a host name, or a network range:

$nmap scanme.nmap.org  

The scan results will show all the host information obtained, such as IPv4 (and IPv6 if available) address, reverse DNS name, and interesting ports with service names. All listed ports have a state. Ports marked as opened are of special interest as they represent services running on the target host:

   Nmap scan report for scanme.nmap.org (45.33.32.156)    Host is up (0.16s latency).    Other addresses for scanme.nmap.org (not scanned):         2600:3c01::f03c:91ff:fe18:bb2f    Not shown: 995 closed ports    PORT      STATE    SERVICE     22/tcp    open     ssh    25/tcp    filtered smtp    80/tcp    open     http  9929/tcp ...