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To use Nmap properly, it is necessary to know how this flag can be implemented to fit the user needs.Īs shown in the first section of this tutorial (The syntax section), to specify a port you just need to type the -p (Ports) flag followed by the port you want to be scanned, as shown below. The most widely used Nmap feature is port scan. Now you know the Nmap syntax and basic output meaning we can proceed learning Nmap flags. Closed|Filtered: Nmap is unable to determine if a port is closed or filtered.Open|filtered: Nmap is unable to determine if a port is open or filtered.Unfiltered: Port is accessible but Nmap is unable to check its state.Filtered: a firewall prevents Nmap from reaching the port.Closed: the port is closed no application is listening.Open: the port is open and an application is listening through it.Regarding this, there are 6 port states which may be reported by Nmap: Understanding the Nmap Output: Port Statesīefore continuing with the explanation on Nmap flags, it is important for readers to understand Nmap outputs. You can add more ports by separating them using commas, this will be explained later in this article. The -p (Port) flag or parameter shown in the example above is used to define one or more ports.