
Nmap is the best port checker right now on the web.

This tool has an inbuilt GUI interface called ZenMAP. They still have the capacity to scan the system and finding vulnerabilities.

This tool can determine the live host, close and open ports, and running services. It is available for the windows, LINUX, MAC, and other operating systems as well. Nmap (Network mapper) is a free and open source tool for the network Discovery and security auditing. In this article I am going to describe all about the open port checker or scanner By using these tools you can check open port and running services. So after completing port scanning of your system, you will be able to find out the open ports and running services as well. Such type of Tools is also looking for running services and associated ports. These tools scan your whole system TCP /UDP connection and check for open ports.

Port scanner or Port checker are the tools used for checking open ports of computer system in network.
