man nmap Command

Man page for apt-get nmap Command

Man Page for nmap in Linux

Ubuntu Man Command : man nmap

Man Nmap  Command

This tutorial shows the man page for man nmap in linux.

Open terminal with 'su' access and type the command as shown below:
man nmap

Result of the Command Execution shown below:

NMAP(1)                                                                 Nmap Reference Guide                                                                 NMAP(1)



NAME
nmap Network exploration tool and security / port scanner

SYNOPSIS
nmap [Scan Type...] [Options] {target specification}

DESCRIPTION
Nmap ( ÄúNetwork Mapper Äù) is an open source tool for network exploration and security auditing. It was designed to rapidly scan large networks, although it
works fine against single hosts. Nmap uses raw IP packets in novel ways to determine what hosts are available on the network, what services (application name
and version) those hosts are offering, what operating systems (and OS versions) they are running, what type of packet filters/firewalls are in use, and
dozens of other characteristics. While Nmap is commonly used for security audits, many systems and network administrators find it useful for routine tasks
such as network inventory, managing service upgrade schedules, and monitoring host or service uptime.

The output from Nmap is a list of scanned targets, with supplemental information on each depending on the options used. Key among that information is the
 Äúinteresting ports table Äù.. That table lists the port number and protocol, service name, and state. The state is either open, filtered, closed, or
unfiltered. Open. means that an application on the target machine is listening for connections/packets on that port. Filtered. means that a firewall,
filter, or other network obstacle is blocking the port so that Nmap cannot tell whether it is open or closed. Closed. ports have no application listening
on them, though they could open up at any time. Ports are classified as unfiltered. when they are responsive to Nmap´s probes, but Nmap cannot determine
whether they are open or closed. Nmap reports the state combinations open|filtered. and closed|filtered. when it cannot determine which of the two states
describe a port. The port table may also include software version details when version detection has been requested. When an IP protocol scan is requested
( sO), Nmap provides information on supported IP protocols rather than listening ports.

In addition to the interesting ports table, Nmap can provide further information on targets, including reverse DNS names, operating system guesses, device
types, and MAC addresses.

A typical Nmap scan is shown in Example 1. The only Nmap arguments used in this example are A, to enable OS and version detection, script scanning, and
traceroute; T4 for faster execution; and then the two target hostnames.

Example 1. A representative Nmap scan


Related Topics

Apt Get Commands