Port checker
Port Checker: What It Is and Why It Matters for Network Security A port checker is a simple but powerful networking tool used to determine whether specific ports on a server, computer, or network are open, closed, or filtered. Ports act as communication endpoints that allow devices and applications to exchange data over the internet. Knowing which ports are accessible is essential for maintaining security, troubleshooting connectivity issues, and ensuring that online services run smoothly. What Is a Port Checker? A port checker tests a specific IP address or domain to see if a particular port is reachable from the outside world. Common ports include 80 (HTTP), 443 (HTTPS), 21 (FTP), 22 (SSH), and 25 (SMTP). By using a port checker, users can quickly verify whether a service is properly configured and accessible or if it is being blocked by a firewall or network rule. Port checkers are available as online tools, de...