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Go into your router settings - usually it's 192.168.1.1 or 192.168.0.1 in the browser address bar, and you'll find a list of connected devices with their IP addresses and MAC addresses. If you don't remember your router password, check the sticker on the bottom of the device. You can also download an app for managing your router (each manufacturer has their own), it's more convenient for tracking guests on the network. I've done this so many times already in 2026 when I suspected unauthorized users - it always works.
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