Port Checker

Check if a specific port is open or closed on any host. Test common ports like 80, 443, 22, 3306, and more. Free online port scanner.

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Port Checker tests whether specific TCP ports are open and accepting connections on any public host or IP address. Instantly check SSH (22), HTTP (80), HTTPS (443), FTP (21), MySQL (3306), or any custom port. Useful for firewall auditing, server configuration verification, and network troubleshooting.

How it works

  1. 1Enter the hostname or IP address
  2. 2Select a preset port or enter a custom port number
  3. 3Click Check Port
  4. 4See if the port is open, closed, or filtered with response time

Who uses this tool

  • ✓System administrators verifying firewall rules
  • ✓Developers checking if services are accessible from outside
  • ✓DevOps engineers auditing server port exposure
  • ✓Network engineers diagnosing connectivity issues
  • ✓Security professionals verifying attack surface

Frequently Asked Questions

What is the difference between open, closed, and filtered?
Open means the port is accepting connections. Closed means the port is reachable but no service is listening. Filtered means a firewall is blocking the probe.
Can I scan private IP addresses?
No. For security reasons, scanning private/internal IP ranges (10.x, 192.168.x, 127.x) is blocked.
Is this a free tool?
Port checking requires at least a Basic plan to prevent abuse scanning.

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