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What is Netstat?

A command-line tool that displays network connections, routing tables, and interface statistics on a system.

Netstat shows active network connections, listening ports, and network statistics. Common usage: netstat -tlnp (TCP listening ports with process info), netstat -an (all connections). Modern replacement: ss command (faster, more info).

Useful for troubleshooting connectivity issues, finding which process uses a port, and monitoring network activity. The ss command (socket statistics) is the modern replacement with better performance on systems with many connections.

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