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How to Use Nmap for Network Discovery and Scanning
Nmap is a powerful tool for discovering and scanning networks. It can be used for monitoring, security, auditing and more. Nmap is an open source tool and is available for both Windows and Linux systems. It can detect live hosts, open ports, services and OS version information. In this blog post, we will look at how to use Nmap for network discovery and scanning.
Network Discovery with Nmap
The first step in using Nmap is to perform a network discovery scan. This will help you to identify the IP addresses of the devices on your network, as well as the operating system they are running. To perform a network discovery scan, you can use the following command:
nmap -sn 192.168.1.0/24
This will scan the 192.168.1.0/24 subnet and return the IP addresses of all the devices on it. You can also use the -sL option to list all the IP addresses in the subnet.
OS Detection with Nmap
Once you have identified the IP address of the devices on your network, you can use Nmap to detect the operating system (OS) they are running. To do this, you can use the following command:
nmap -O 192.168.1.10
This will detect the OS of the device with the IP address 192.168.1.10. You can use the -O option with multiple IP addresses to detect the OS of multiple devices at once.
Port Scanning with Nmap
Nmap can also be used to scan for open ports on devices. This can be useful for finding out which services and applications are running on a device. To do this, you can use the following command:
nmap -sU -sT -p 1-65535 192.168.1.10
This will scan the range of ports 1-65535 on the device with the IP address 192.168.1.10. The -sU and -sT options tell Nmap to perform both a UDP and TCP port scan. You can use the -p option to specify a different range of ports to scan.
Conclusion
Nmap is a powerful tool for network discovery and scanning. It can be used to detect live hosts, open ports and even operating systems. In this blog post, we have looked at how to use Nmap for network discovery, OS detection and port scanning. Once you know how to use Nmap, you can use it to keep track of what is happening on your network.
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