[Bash] 10 useful Nmap commands for GNU/Linux system administrators
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BY sandeep.sasikumar
4 years ago
Networking
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Nmap(Network-mapper) is an open source tool that is pretty useful for networking scanning. This tool provides various options that are useful for carrying out security audits. Nmap is a powerful tool used to check the network inventory, host uptime etc. If you are a GNU/LINUX administrator, you may find the following 10 Nmap commands extremely useful

Some of the useful Nmap commands are as mentioned below:

  1. Scan a single host in the network.
     nmap [IP-address of the host] 
  2. Scan multiple hosts in the network.
     nmap [Hostname of the host] 
  3. Scan whether a host is firewall protected
     nmap -sA [IP-address of the host] 
  4. Scan whether a network is firewall protected
     nmap -sA [IP-address series of the network] 
  5. Scan a full network and find out which devices are up and running
     nmap -sP [IP-address series of the network] 
  6. Fast scan options
     nmap -F [IP-address series of the network] 
  7. Display all open ports and also display the number of closed ports
     nmap --open [IP-address of the host] 
  8. Scan specific ports
     nmap -p [port-number] [IP-address of the host] 
  9. Scan the operating system of remote host
     nmap -O [IP-address of host] 
  10. Scan the service version number of remote host
     nmap -sV [IP-address of the host] 

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