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Online Port Checker

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Port Scan Online
Online Port Checker – Test if Port 80 or 443 is Open (Free Tool)

Online Port Checker – Is Your Website Online?

Instantly verify if port 80 (HTTP) or port 443 (HTTPS) is open on any domain. Free, fast, and completely private — no data leaves your browser.

🔒 Only ports 80 & 443 can be scanned in-browser due to security restrictions

These are the only web ports browsers allow to be tested.

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Why Use an Online Port Checker?

An online port checker helps you verify whether your web server is correctly configured to accept traffic on standard internet ports. Port 80 (HTTP) and port 443 (HTTPS) are critical for website accessibility — if either is blocked or misconfigured, visitors cannot reach your site.

Common use cases include:

  • After installing an SSL certificate: Confirm that HTTPS (port 443) is responding
  • When troubleshooting downtime: Quickly determine if the issue is network-related
  • During firewall setup: Validate that cloud security groups allow web traffic
  • After DNS changes: Ensure your domain resolves to a live, responsive server

Important: Due to built-in browser security, this tool cannot scan non-web ports like SSH (22), FTP (21), or RDP (3389). For those, use command-line tools like nmap.

Frequently Asked Questions

What ports can this tool actually scan?

This tool can only scan port 80 (HTTP) and port 443 (HTTPS). Web browsers intentionally block JavaScript from accessing other TCP ports (like 22 for SSH or 3389 for RDP) to prevent websites from probing your internal network. Any online tool claiming to scan non-web ports either uses a backend server or displays simulated results.

Why does my site show port 80 as closed?

Many modern websites disable HTTP (port 80) entirely and redirect all traffic to HTTPS (port 443). This is considered a security best practice. If port 80 appears closed but port 443 is open, your site is correctly configured for secure-only access.

Is this port checker safe to use?

Yes. All scanning happens directly in your browser. No data is transmitted to any server — your domain, IP address, and scan results never leave your device. This makes the tool fully compliant with privacy laws like GDPR and CCPA.

How can I scan SSH or RDP ports?

To scan ports like 22 (SSH) or 3389 (RDP), you must use a command-line tool such as nmap from your own machine: nmap -p 22,3389 your-server.com. Browsers will never allow this from a webpage for security reasons.