From 19 Hours to Under a Second: Building a Blazing-Fast TCP Scanner in Go
· 6 min read
Our network discovery workflow used to take longer than a transatlantic flight. A full sweep across 21,000 devices required 19 hours with the TCP connect() scanner we shipped in early 2025. That left ServiceRadar’s inventory stale by the time scans finished. Internally, we challenged ourselves to deliver near-real-time visibility—and the result is a Go-powered SYN scanner that now finishes the same job in under one second.