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nmap command

Introduction

    Nmap allows you to query a computer network or a machine to know who is on the network or which ports are opened on a server.

Overview

    NMap can do a lot of things.

    What machines are on the network

      map -sP -PT -PI -T 3 192.168.2.*
      will returns: 
      Starting Nmap 4.62 ( http://nmap.org ) at 2008-12-29 15:11 CET
Host 192.168.2.1 appears to be up.
MAC Address: 00:10:4B:C3:93:42 (3com)
Host 192.168.2.64 appears to be up.
MAC Address: 00:08:54:09:58:64 (Netronix)
Host 192.168.2.68 appears to be up.
Nmap done: 256 IP addresses (3 hosts up) scanned in 5.121 seconds

    Knowing what ports are open on a machine

      nmap 192.168.2.64
      will returns: 
      Starting Nmap 4.62 ( http://nmap.org ) at 2008-12-29 15:15 CET
Interesting ports on 192.168.2.64:
Not shown: 1712 closed ports
PORT   STATE SERVICE
22/tcp open  ssh
53/tcp open  domain
80/tcp open  http
MAC Address: 00:08:54:09:58:64 (Netronix)

Nmap done: 1 IP address (1 host up) scanned in 1.626 seconds

    Determine what software is behind which port

      nmap -sV -p80 192.168.2.64
      will returns: 
      Starting Nmap 4.62 ( http://nmap.org ) at 2008-12-29 15:20 CET
Interesting ports on 192.168.2.64:
PORT   STATE SERVICE VERSION
80/tcp open  http    Apache httpd 2.2.9 ((Ubuntu) PHP/5.2.6-2ubuntu4 with Suhosin-Patch)
MAC Address: 00:08:54:09:58:64 (Netronix)

Service detection performed. Please report any incorrect results at http://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 6.472 seconds

    Determine what OS is installed on a machine

      nmap -O 192.168.2.64
      will returns:

NMap on the Web

 

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