Port Scanner Online Free
Verify public TCP port configurations for server hosts. Scan common service endpoints (80, 443, 22, 21) to audit open ports and check system accessibility.
Port Scanner
Check common open ports for domains or IPs you own or have permission to test.
How to Use This Tool
Enter Domain or IP
Type the target domain name or IP address you are authorized to scan.
Select Ports to Scan
Choose common defaults or enter specific port lists (e.g., 22, 80, 443).
Initiate Scan
Click the Scan Ports button to query connection ports.
Verify Port Status
Review open, closed, or filtered flags to audit server service visibility.
Auditing server SSH port exposure
You have configured a private server and want to ensure SSH port 22 is closed to public traffic. Enter your public IP into the checker. The tool scans port 22 and reports 'Closed/Filtered', verifying your firewall blocks external access.
Common Use Cases
Firewall Auditing
Confirm that only authorized services (like HTTP/HTTPS) are visible to the public internet.
Server Hardening
Identify unused ports (like database ports 3306 or 5432) that should be restricted to local interfaces.
DevOps & SREs
Verify that web application servers correctly answer requests on custom ports.
Networking Education
Learn about TCP flags, port-to-service associations, and standard server firewalls.