Port Checker - Verify Open Ports Online
Port Checker is an essential online service for verifying open ports on your device. Ideal for troubleshooting network issues and ensuring proper port forwarding configurations, this tool helps you identify whether specific ports are accessible from the internet, enhancing your network security and connectivity.
Key Features
- Real-time port scanning
- Multiple port range support
- Service name detection
- Detailed port state information
- Common ports quick check
- Results export capability
Use Cases
- Troubleshooting connection issues
- Security vulnerability assessment
- Network service verification
- Firewall configuration testing
- Server port availability check
- Basic network diagnostics
How to Use
- Enter an IP address or hostname
- Specify port number or range
- Click "Check Ports" to start scan
- View real-time results
- Save results if needed
Frequently Asked Questions
A port scan is a technique used to check which ports on a network are open, closed, or filtered.
Ports may be filtered by firewalls or other security measures to prevent unauthorized access.
Common ports include 80 (HTTP), 443 (HTTPS), 22 (SSH), 21 (FTP), and 25 (SMTP).
Port scanning your own systems is legal, but scanning systems without permission may be illegal.
TCP is connection-oriented and reliable, while UDP is connectionless and faster but less reliable.
Open means the port is accepting connections, closed means it's not listening, and filtered means a firewall is blocking access.