NMap Command
Nmap (an acronym of Network Mapper) is an open-source command-line utility to securely manage the network. Nmap command has an extensive list of options to deal with security auditing and network exploration.
orPrerequisites To use the Nmap utility, the Nmap must be installed on your Ubuntu 22.04. Nmap is available on the official repository of Ubuntu 22.04. Before installation, it is a better practice to update the core libraries of Ubuntu 22.04 as follows:
Syntax of Nmap command
The syntax of the Nmap command is given below:
The Nmap command can be used to scan through the open ports of the host. For instance, the following command will scan the “xxx.xxx.xxx” for open ports..How to use the Nmap command to scan specific port(s)
By default, the Nmap scans through only 1000 most used ports (these are not consecutive but important). However, there are a total of 65535 ports. The Nmap command can be used to scan a specific port or all the ports.
To scan all ports: The -p- flag of the Nmap command helps to scan through all 65535 ports:
To scan a specific port: One can specify the port number as well. For instance, the following command will scan for port 88 only:
How to use the Nmap command to get the OS information
The Nmap command can be used to get the Operating System’s information. For instance, the following command will get the information of the OS associated with the IP address.