Port Scanner
Check if common ports are open on a host — educational reference for common port numbers and services.
About Port Scanner
Port scanning identifies which network ports are open (accepting connections) on a host. Each open port represents a service listening for connections — port 80 for HTTP, 443 for HTTPS, 22 for SSH, 3306 for MySQL, etc. Understanding which ports are open is essential for network security auditing, firewall configuration, and troubleshooting connectivity issues. Note: full port scanning requires network-level access and cannot be performed from a browser — this tool provides a reference guide and simulates expected results.
FAQ
Can I scan any host from a browser?
No. Browser JavaScript cannot open raw TCP connections or ICMP packets due to security restrictions. Full port scanning requires tools like nmap running on a computer with network access to the target. From the command line: nmap -sV -p 1-1000 target.com for a comprehensive service version scan.