Online Port scanner is described as 'Port Scanner Online is a user-friendly website that allows you to quickly and easily scan the ports of a target system over the internet' and is a IP Scanner in the security & privacy category. There are seven alternatives to Online Port scanner for a variety of platforms, including Windows, Linux, Mac, BSD and Flathub apps. The best Online Port scanner alternative is Nmap, which is both free and Open Source. Other great apps like Online Port scanner are Angry IP Scanner, Zenmap, NetPeek and Advanced IP Scanner.