Port Scanner
Scan 20 well-known ports on any domain or IP address.
What Are Network Ports?
Every service on a server listens on a specific port - a number from 0 to 65535 that lets the OS route traffic to the right application. An open port means a service is actively accepting connections there.
Scan Results Explained
Open
A service is accepting connections. If unexpected, this may be a security risk.
Filtered
A firewall is blocking the response. It's unclear whether a service is running.
Closed
Nothing is listening on this port. The connection was rejected immediately.
Why Check Your Ports?
Open ports that shouldn't be exposed are potential entry points for attackers. Regular scanning helps with server hardening - for example, discovering that MySQL (3306) or RDP (3389) are reachable from the internet without your knowledge.
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