(also Network Mapper)
Nmap is a free, open-source tool network administrators use to map out the devices their systems are running, find open ports and available hosts, and identify security risks. It’s a versatile tool that can help monitor single hosts or even vast networks with thousands of devices and subnetworks.
Nmap as a malicious tool
- Port scanning is not illegal, but it allows cybercriminals to see open ports and use them to exploit vulnerabilities in the system.
- To protect the network from malicious port scanning, network administrators can set up a firewall and configure it to only respond to requests from known clients.