Yep. Wander into any subdivision.....and how many 192.168.0.100’s or 192.168.1.104’s you think you’d find?
Dozens.
That’s the IP range of the router, not the IP of the service the router is connected to.
Or even scarier - so many people with 127.0.0.1 it’s almost like people don’t care any more.
So many manufacturers have done this “one touch setup” crap that completely removes the human element from security and creates simple-to-guess garbage passwords with poor wireless security.
I’ve demonstrated to numerous neighbors how easy it was to get into their networks, and they’ve all asked me to help secure them. I never charge when they ask. Heck, even my wireless network got broken into a few years ago after I neglected to turn off port forwarding for a test I was conducting. There ARE ethical hackers out there, but they’re a lot fewer than those who wish to exploit you.
The IP they care about is the public IP address on the WAN side of the router. That can absolutely be associated with a given ISP account. It is essential that you secure the WLAN side of your network as previously suggested several times.