The only router I've had at home that used Class 10.0.0.0/8 by default was a AirPort Time Capsule. The other three or four I've had over the years were configured to Class 192.168.0.0/16 by default
Yep and the 10.0.0.0 on an Airport killed my wife's VPN as it couldn't route as expected and then I wasted half a day trying to figure out what might be wrong on a completely locked down desktop after 1st line support gave up and said it should work must be a problem with your wifi.