When it comes to securing your network from intrusion or attacks, one of the most commonly followed security measures is to regularly scan your network ports and close all open ports. This is because open ports can expose your network to several security vulnerabilities. To tackle the risks introduced by open ports, network admins rely on port scanners. Port scanners help you identify, inspect, and analyze network ports, and aid in reducing your network's attack surface by closing open ports. This makes port scanners an indispensable tool to ensure network security. In this post, we discuss what open ports are, their vulnerabilities, and how you can defend your network with port scanners.