Download
Simple, reliable port scanning
A port scanner is a utility that inspects the network ports on a machine to determine their current status. Ports act as channels through which your computer exchanges data with the Internet and other devices; knowing which ports are reachable is the first step to controlling what can connect to your system.
How ports work
- An open port means external connections can reach an application or service on your computer.
- A closed port prevents outside access to that specific channel.
- Some open ports can expose services that, if vulnerable, allow attackers to take control or cause harm.
Why you should scan
Running periodic scans helps you spot unintended open ports so you can close or secure them. Keeping only essential ports accessible reduces the attack surface and lowers the risk of malware or intrusion.
Who benefits most
- Home users worried about viruses and unauthorized access will find port-scanning tools particularly useful.
- Small-office or LAN administrators can use scans to verify that services are only available where they should be.
Interface and results
This port-scanning tool presents information in a clean, beginner-friendly layout. A tree-style view lists each port and its state (open, closed, filtered), making it simple to see what’s exposed at a glance. The results are arranged so you can quickly identify which services require attention.
Key features:
- Clear visual breakdown of ports and their statuses.
- Immediate indicators for risky or unexpected open ports.
- Easy navigation for users with little to no prior experience.
How this improves security
By highlighting ports you don’t need, the scanner helps you take corrective action—whether that means closing a port, updating a service, or applying a firewall rule. The tool’s straightforward feedback makes it practical for both novices and experienced users to tighten security on a PC or across a LAN.
Additional resources
- Free cheat sheets and recommended alternatives are available for users who want more detailed guidance or different scanning options.
Technical
- Mac
- German
- English
- Full
