How to disable the very little-known AT&T setting that can appear to hijack your home DNS lookups and redirect to 104.239.207.44
DNS queries on home network suddenly resolving hosts to 104.239.207.44.
You will see SPORADIC mis-resolutions of EVERYTHING to that 104.239.207.44 address if their crappy router happens to hear your PC's DHCP request - EVEN IF ANOTHER DHCP SERVER ON THE NETWORK assigns the ultimate address.