TCP Port Scanner
Scan for open TCP ports on any hostname — check common ports like 80, 443, 22, 3306 and custom ranges
Target Host
Limited to 5 scans per 10 minutes per IP. Ports 80/443 aren't scannable via raw sockets; use the SSL & HTTP Headers or Latency tools instead.
About TCP Port Scanner
Scan for open TCP ports on any host to audit exposure and connectivity. Check common services like 80, 443, 22, and 3306, or define your own range to see what is reachable. A fast, free way to verify firewalls, troubleshoot services, and tighten security.
- Scan common ports or custom ranges
- Verify firewalls and service reachability
- Fast edge-based scanning
Frequently asked questions
Which ports should be open?
Only the ones your services need — typically 80 and 443 for web; everything else should stay closed unless required.
Is port scanning legal?
Scanning systems you own or have permission to test is fine; scanning third-party hosts without consent may violate their terms.