10 Best Open Port Scanner and Port Checker Tools for 2019
Use Nmap to find open ports on Internet facing systems with this online port scanner. Test servers, firewalls and network perimeters with Nmap Online providing the most accurate port status of a systems Internet footprint. It is simply the easiest way to perform an external port scan. Launch Nmap Port Scan
To test if you might be vulnerable to the SASSER virus, use the above port scan tool to scan port 445. If the portscan says it can get through port 445 on whatever firewall you hopefully have, and your computer's port 445 is also open/active, then you may be susceptible to the SASSER virus. How Do I Open a Port on Windows Firewall? Nov 15, 2018 How To Forward Ports for Games
Port Checker is a simple and free online tool for checking open ports on your computer/device, often useful in testing port forwarding settings on a router. For instance, if you're facing connection issues with a program (email, IM client etc) then it may be possible that the port required by the application is getting blocked by your router's firewall or your ISP .
Open Portwebsite is a free Open Port Check Toolto check a remote TCP port state – open or close. This tool can be also used to test your router or device for port forwarding.