Generate random port numbers for development. Choose from registered, dynamic, or custom ranges.
Frequently Asked Questions
Ports 0-1023 are 'well-known' ports reserved for system services (HTTP on 80, HTTPS on 443). Ports 1024-49151 are 'registered' ports used by applications (MySQL 3306, PostgreSQL 5432). Ports 49152-65535 are 'dynamic/private' ports for temporary or custom use.
On Linux/Mac, use 'lsof -i :<port>' or 'netstat -tlnp'. On Windows, use 'netstat -an | findstr :<port>'. This tool flags commonly used ports but cannot check your system's actual port usage.
Well-known ports (0-1023) typically require root/admin privileges and are reserved for standard services. Using registered or dynamic ports avoids conflicts with system services and permission issues during development.