What Is a Port Scanner?
A port scanner probes a server or host for open network ports. Open ports indicate running services that accept connections, while closed or filtered ports may signal firewalls or inactive services. Port scanning is an essential tool for network administrators and security professionals.
Common Ports & Services
- 22SSH — Secure remote shell access
- 80HTTP — Unencrypted web traffic
- 443HTTPS — Encrypted web traffic
- 3306MySQL — Database server
- 5432PostgreSQL — Database server
- 6379Redis — In-memory data store