FreeKB - Display open, closed and blocked ports
nmap - Display open, closed and blocked ports

Follow these steps to display open, closed and blocked ports using nmap.

  1. In the Target field at the upper left-hand corner of Nmap, type the IP Address of your subnet and select Scan.  Following are some common IP subnets:
  2. Select the Ports / Hosts tab to view open, closed and blocked ports.

In this example, we have a network with about 15 hosts. We can highlight an IP address to view the state of the ports on a particular host.

The -p (ports) option can be appended to the command to only search for a certain port in question.

nmap -p 80,443 -O sS






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