How to Use NMAP to scan resources

Nmap (Network Mapper) is an open-source tool used for network exploration and security auditing. It is a powerful utility that can be used for port scanning, network inventory, vulnerability detection, and much more. In this guide, we will explain how to use Nmap to scan resources.

Step 1: Install Nmap First, you need to install Nmap on your system. Nmap is available for most operating systems, including Windows, Linux, and macOS. You can download the latest version of Nmap from the official website (

Step 2: Determine the target Before you can scan a resource, you need to determine the target IP address or hostname. You can use various tools like ping or traceroute to identify the target resource.

Step 3: Scan the resource Once you have determined the target, you can start scanning the resource using Nmap. Open the command prompt or terminal on your system and type the following command:

nmap [options] [target]

Replace the [options] with the appropriate Nmap options and [target] with the IP address or hostname of the resource you want to scan.

Step 4: Review the scan results After the scan is complete, Nmap will display a summary of the scan results. The output will include information about open ports, operating system details, and other relevant information about the target resource. You can use this information to identify any security vulnerabilities or misconfigured services on the target.

Some of the most commonly used options with Nmap are:

  • -sS: This option specifies a SYN scan, which is the most common type of scan used in Nmap. It sends SYN packets to each port on the target, and the responses are used to determine which ports are open or closed.
  • -sU: This option specifies a UDP scan, which is used to identify open UDP ports on the target. This type of scan can be useful for detecting services that use UDP, such as DNS or DHCP.
  • -O: This option specifies an operating system detection scan, which is used to identify the operating system running on the target.
  • -A: This option specifies an aggressive scan, which includes various Nmap options to provide more detailed information about the target.

There are many other options available with Nmap, and you can find more information about them in the Nmap documentation.

In summary, Nmap is a powerful network exploration and security auditing tool that can be used to scan resources for vulnerabilities and misconfigured services. By following the steps outlined in this guide, you can use Nmap to scan resources and gain valuable insight into the security of your network.