Port Scanner
Discover open ports and running services with Nmap
Authorization Required
Only scan systems you own or have explicit written authorization to test. Unauthorized port scanning may violate laws including the Computer Fraud and Abuse Act (CFAA) and equivalent legislation in your jurisdiction. You are solely responsible for ensuring your scans are legal and authorized.
The Port Scanner is a network reconnaissance tool powered by the Nmap engine that discovers open ports and identifies running services on target systems. Port scanning is a fundamental technique in cybersecurity assessments, penetration testing, and network security audits. When you scan a target IP address or domain, the tool probes common TCP ports to determine their state (open, closed, or filtered) and attempts to identify the service and version running on each open port. This information is critical for understanding a system's attack surface, identifying potential vulnerabilities, verifying firewall configurations, and ensuring that only authorized services are exposed to the network. The results include port numbers, service names, product identification, and version information where available. Commonly scanned ports include HTTP (80/443), SSH (22), FTP (21), SMTP (25), DNS (53), RDP (3389), and database ports (3306, 5432, 27017).