Port Scanner

• Free online port scanner supporting single ports, port ranges, and common port groups
• Quickly detect each port's open/closed status, the associated service, and response latency for network troubleshooting, security assessment, and service discovery

1. Open the tool page — no download or installation needed, it runs right in your browser
2. Choose a scan mode (single port, port range, or common port group), enter the target host (IP or domain), set the port or group, and optionally adjust the timeout and concurrency
3. Click "Start Scan" to begin, then review the results table once it finishes; use "Copy Results" to copy the list, or "Reset" to clear and start over

• This tool is completely free and requires no sign-up
• Everything runs locally in your browser — your data never leaves your device

Free online port scanner supporting single port, port range, and common port groups. Quickly detect target host port status, service types, and response latency for network security assessment and service discovery.

Open the tool page — no download or installation needed, it runs right in your browser Choose a scan mode (single port, port range, or common port group), enter the target host (IP or domain), set the port or group, and optionally adjust the timeout and concurrency Click "Start Scan" to begin, then review the results table once it finishes; use "Copy Results" to copy the list, or "Reset" to clear and start over

This tool is completely free and requires no sign-up Everything runs locally in your browser — your data never leaves your device

Yes, Port Scanner is completely free. No download or installation required — it runs right in your browser.