What is a Port Scanner and Why Use One?
A port scanner is a simple but powerful tool used to check which network ports are open, closed, or filtered on a remote device. It’s commonly used by system administrators, network engineers, and cybersecurity professionals to troubleshoot connectivity, perform security audits, or verify if specific services like SSH, HTTP, or FTP are accessible from the internet.
Our free online port scanner lets you scan multiple TCP ports at once by entering an IP address and a list of ports. It works instantly—no installation or sign-up required. Just enter a target IP (like your VPS or router), specify common ports such as 22, 80, 443, or custom ones, and get real-time results.
This tool is useful for:
Checking if a port is open on your server
Verifying firewall rules or NAT forwarding
Detecting unintended exposed services
Testing if web servers, mail servers, or SSH are reachable
Whether you're managing a cloud server, testing your home network, or improving your security posture, this port scanner provides a fast and reliable way to map open ports and reduce risk.