Thursday, April 3, 2014

Simple host scan with nmap

Sometimes it's useful to quickly scan for hosts in a given range. This is easily achieved with nmap.

  1. RTFM: Host Discovery chapter in nmap book
  2. Know which range I want to scan -- e.g., 192.168.5.0/24
  3. Check which version of nmap I'm using:
    # # This is on a SLES 11-SP3 box
    # nmap --version
    
    Nmap version 4.75 ( http://nmap.org )
    
    # # This is on openSUSE 13.1
    # nmap --version
    
    Nmap version 6.40 ( http://nmap.org )
    Platform: x86_64-suse-linux-gnu
    [snip]
    
  4. Run the command:
    # # on nmap version 4.75
    # nmap -sP 192.168.5.0/24
    ...wait for output...
    
    # # on nmap version 6.40
    # nmap -sn 192.168.5.0/24
    ...wait for output...
    

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