How to Check Open Ports
1. Check Ports Using Web Tools
The easiest and fastest method!
Use our IP/Port Checker Tool to check instantly.
2. Check Ports in Windows
- Use netstat -an to check currently open ports
- Test external connection with telnet [IP] [PORT]
Examples:
netstat -an
telnet 8.8.8.8 80
netstat -an
telnet 8.8.8.8 80
3. Check Ports in Linux
- Use tools like nmap, nc (netcat)
Examples:
nmap -p 80,443 8.8.8.8
nc -zv 8.8.8.8 80
nmap -p 80,443 8.8.8.8
nc -zv 8.8.8.8 80
Frequently Asked Questions
- If a port is closed? Check firewall settings, router configuration, and server program status.
- Not using a public IP? External access might not be possible.