Port Scanner
Check if common ports are open
What is Port Scanner?
Port Scanner checks whether common network ports on a given host are open or closed. It tests well-known ports (HTTP, HTTPS, SSH, FTP, database ports, etc.) to help identify which services are running and accessible.
When to use this tool
- Verifying that a web server is listening on the expected port
- Checking if a database port is exposed to the internet
- Diagnosing firewall or network connectivity issues
- Auditing which services are accessible on a host
How it works
Attempts to establish a TCP connection to each target port on the specified host. If the connection succeeds within a timeout window, the port is marked as open; if it is refused or times out, it is marked as closed or filtered. All scanning happens from the browser via fetch or WebSocket probes.
About Port Scanner
Check if common ports are open It runs entirely in your browser — no files are uploaded to any server, ensuring complete privacy and instant results.
- •Look up IP address geolocation
- •Reference all HTTP status codes
- •Parse and analyze URL components
- •Check common port availability
Last updated: 2025-01-15
FAQ
Check if common ports are open
Yes, completely free. No signup required.
Yes. Runs entirely in your browser, no files uploaded.
Yes, works on any device with a modern browser.
No, everything runs in your browser.