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Port Scanner

Check common open ports on a host

Port Scanner

Quickly check if common ports are reachable on a domain or IP address.

Network Security Utility

Online Port Scanner – Check Open Network Ports

This online port scanner helps you quickly check whether some of the most common network ports are reachable on a given domain or IP address. It provides a fast, browser-based way to understand basic exposure of services like HTTP, HTTPS, SSH, FTP, mail, and other standard ports - without installing any extra tools.

About This Tool

In networking and cybersecurity, an “open port” means a service is listening and accepting connections. Misconfigured or unnecessary open ports can increase your attack surface and expose internal services to the public internet. This port scanner gives you a simple, non-intrusive way to check if popular ports such as 80 (HTTP), 443 (HTTPS), 22 (SSH), 21 (FTP), 25 (SMTP), 53 (DNS), 110 (POP3), and 8080 (alternate HTTP) appear reachable from your current network.

The tool is designed for awareness, quick checks, and educational use - not for deep vulnerability scanning. It's useful for admins, developers, and power users who want a fast sanity check on basic exposure, firewall behaviour, or hosting configuration from the browser.

What You Can Check

  • Whether standard web ports (80/443/8080) respond from your network.
  • If SSH (22) or FTP (21) ports appear open on a public server.
  • Basic visibility of mail and DNS-related ports (25, 53, 110).
  • Simple confirmation that firewall or security rules are blocking access.
  • Rough idea of which services may be publicly reachable on a host.

Feature Explanation

The scanner cycles through a fixed list of commonly used ports and attempts to reach each one using a lightweight browser request. If the browser is able to establish a basic connection without timing out, the port is labeled as “Open”. If the request fails or is blocked, the port is labeled as “Closed” from the perspective of your current browser and network path.

Because this is browser-based, results are influenced by HTTPS requirements, CORS policies, network firewalls, and security settings. It does not perform low-level TCP/UDP or ICMP scanning like a dedicated security scanner or tools such as nmap.

How It Works

  1. You enter a domain name or IP address you want to test.
  2. The tool iterates through a predefined list of common ports (80, 443, 22, 21, 25, 53, 110, 8080, etc.).
  3. For each port, the browser sends a fetch request such as https://host:port with a short timeout.
  4. If the request does not error or abort in time, the port is marked “Open”.
  5. If the request fails, times out, or is blocked, the port is marked “Closed”.

The result reflects what your browser can reach over HTTPS from your current network - not an absolute statement about the server's full port state.

How To Use

  1. Enter a valid domain or IP address (for example: example.com or 8.8.8.8).
  2. Click on Start Scan to begin the port checks.
  3. Wait a few seconds while the tool tests each common port in sequence.
  4. Review the results list showing which ports appear “Open” and which appear “Closed” from your browser.
  5. If needed, adjust firewall, hosting, or server settings and run the scan again to compare.

Who Is This For?

  • Developers deploying new web apps or APIs.
  • Sysadmins quickly verifying exposed ports after configuration changes.
  • Freelancers and agencies checking basic hosting security for clients.
  • Students learning about ports, services, and basic network security.
  • Curious users who want to see which services on a server may be reachable from the internet.

Privacy & Responsible Use

All checks are initiated from your own browser to the host you provide. No scan results are stored or logged by this tool. It performs only lightweight connectivity checks and does not attempt to bypass security controls or run intrusive scans. Always use this tool responsibly and only on servers, domains, or IP addresses that you own, manage, or have explicit permission to test. For complete security audits or compliance checks, dedicated professional tools and security experts are recommended.