Writing a TCP port scanner in Go: goroutines, timeout, and CSV report

▤ Summary

This article walks through building a TCP port scanner in Go. It explains how to read target lists, resolve hostnames to IPv4 addresses, and scan ports concurrently with goroutines and a semaphore. It also shows how the scanner classifies ports as open, closed, or filtered using timeouts. The piece finishes by writing the scan results to a CSV report and sorting the output for easier review.

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