There is a myth that "passive" scanning is legal. It isn't. Accessing a computer network (a router) without authorization violates the Computer Fraud and Abuse Act in the US and similar laws globally. Even if the door is unlocked (WPS is on), walking through it without permission is trespassing.
If you are trying to "jumpstart" your internet access, the theory is simple: Run Dumpper, identify the vulnerable router next door, and let the software hand you the password. While the concept sounds like a Robin Hood heist for bandwidth, downloading Jumpstart Dumpper from random file-sharing sites is one of the riskiest moves you can make. Jumpstart Dumpper Download
acts as the accelerator. It automates the process, scanning for networks with WPS enabled, analyzing the router manufacturer (TP-Link, D-Link, etc.), and attempting the default PIN algorithm specific to that brand. There is a myth that "passive" scanning is legal