🔌

Port Check

Detect open and closed ports on any server or IP address. Common ports are scanned automatically.

🔍

Auto Scan

Leave ports blank to automatically scan 21 common ports (HTTP, HTTPS, SSH, MySQL, etc.).

⚡

Fast Results

Ports are checked sequentially with a 2.5s timeout each. Results appear after all ports complete.

🎯

Custom Ports

Enter comma-separated ports like 80,443,8080 to check only specific ports.

⚠️

Usage Note

Use this tool only on your own servers or systems you have explicit permission to test.

Port Check Tool — Detect Open & Closed Ports

Network ports are virtual endpoints for communication. Each service runs on a specific port: HTTP on 80, HTTPS on 443, SSH on 22, MySQL on 3306. Our port checker tests connectivity to any server port from our monitoring node.

What does "port open" mean?

An open port means a service is actively listening for connections on that port. A closed port means no service is running, or a firewall is blocking it.

Is it legal to scan ports?

Port scanning your OWN servers is always legal and recommended for security audits. Scanning servers you don't own without permission may violate laws. Use this tool only on systems you control.

Which ports should be open?

Only open ports that are necessary: 80/443 for web, 22 for SSH (ideally restricted by IP), 25/587 for mail. Close all unused ports to minimize attack surface.

Why is my SSH port open to the world?

Exposing SSH (port 22) publicly invites brute-force attacks. Consider changing to a non-standard port, using fail2ban, or restricting access by IP via firewall rules.

port checkopen port checkerport scanner onlinecheck if port is opennetwork port testertcp port checkport status checker