PortChecker

A Port Checker Tool is an online or offline tool that checks whether a specific port on an IP address or domain is open or closed. In very simple words, it tells you if a door is open or locked. Every device connected to the internet uses ports. These ports allow data to enter and leave your system. For example, websites usually use port 80 or 443, emails use different ports, and games use their own ports. If a port is closed or blocked, the service using that port will not work.