Are you using a wifi or radio sending router? I have heard of neighbors using another's internet service because that person's router was not set up properly with security to prevent that happening.

It is possible to find ones own files in a search or browse host on rare occasions. Happened to me recently. However, it was my external ip address, not my network or router address.

AFAIK & might be wrong, but those whose ip addresses are same as a routers are those whose setups are not set correctly.