Port-Scanner

Port-Scanner identifies exposed ports on any IP address or domain. Regular port scanning is a practical first step in assessing your network's external attack surface.

Run a port scan

If the result reads "Host seems down," the target's firewall or router is configured to block ICMP ping requests.

Check results:

Enter an IP address or domain and press Scan to see the open and closed ports.

Proxy-Scanner video guide

This video walkthrough covers how to configure and run a scan, interpret open and closed port results, and act on findings to reduce your network's external attack surface. Learn how to identify exposed ports on any IP address or domain using Proxy-Seller's Port Scanner. 

Using Port-Scanner online

Scan any IP address, domain, or hostname for open ports, including your own connection or any external target. Get results in under 20 seconds, with no installation or account required. 

Run a scan in 6 steps:

  1. Connect directly to your network rather than through a Wi-Fi router to ensure the scan targets the correct IP address.

  2. Scroll to the port scanner panel on this page.

  3. Enter the target IP address or domain.

  4. Select a scan type (Popular ports for a fast surface-level check, or Hidden ports for an extended scan across non-standard ranges).

  5. Click Scan.

  6. Run the scan 2–3 times to cross-validate results. 

The scanner returns a structured list of port numbers, protocols, and status—Open or Closed—for every port checked. Export the full report in .csv format with a single click.

Why accurate port data matters

The port scanner returns one of two statuses for each port checked:

  1. Closed. The port is not reachable from outside your network. No external connection can be established through it. Your system is not exposed on this port, and no action is required.

  2. Open. The port is accessible from outside your network. This indicates a potential attack surface: open ports can be targeted by unauthorized remote connections. If a port is open unexpectedly, audit the services currently using it, review their network access permissions, and close any that don't require external exposure.

Knowing the exact status of your ports gives you a clear, evidence-based view of your network's external exposure. Proxy-Seller's Port-Scanner returns precise, reliable results. Your team will thus have the data needed to identify vulnerabilities, validate security configurations, and reduce the risk of unauthorized access before it becomes an incident.