I scanned my home network and found three devices I didn't recognize — one was a security nightmare

Most people trust their router's connected device list as a source of truth, and that's where the trouble starts. The list gives you cryptic hostnames, raw hardware addresses, and occasionally nothing at all, which makes it nearly impossible to know whether everything on your network is supposed to be there. Just like when you map your Wi-Fi, scanning your network can speed things up by showing what you find.

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