Port Scanner
Our online port scanner checks your IP address to determine whether the ports below are open or closed — handy for troubleshooting connectivity, like confirming a web server (port 80/443) is reachable from outside your network.
What is a port scanner?
A port scanner is a utility (online or software) that checks ports to determine if they are open. It works by sending network requests to a range of ports on a target device or network, then analyzing the responses to see which ports are open and which are closed. This is useful for identifying potential security vulnerabilities, monitoring network activity, or troubleshooting connectivity issues.
What are ports?
In computer networking, a port is a virtual endpoint that lets different services or applications communicate over a network. Ports are identified by numbers (port numbers) ranging from 0 to 65535. They're fundamental to networked systems, enabling communication between applications and services across the internet or within a local network.