8.8.8.8 (Google DNS) unreachable from U-Verse FTTH and AT&T Cellular

8.8.8.8 (Google DNS) unreachable from U-Verse FTTH and AT&T Cellular.

It is not a Google problem, as 8.8.8.8 is reachable from Comcast, WOW, and Google Fiber.

Traceroute:

 1 [Internal Router IP Removed] ([Internal Router IP Removed]) 4.421 ms 2.079 ms 2.140 ms
 2 162-239-32-1.lightspeed.brhmal.sbcglobal.net ([Public IP Removed]) 3.616 ms 3.981 ms 4.567 ms
 3 99.173.217.198 (99.173.217.198) 5.428 ms 4.178 ms 4.397 ms
 4 99.133.13.148 (99.133.13.148) 7.816 ms 8.690 ms 6.487 ms
 5 12.83.101.149 (12.83.101.149) 11.624 ms
 12.83.101.137 (12.83.101.137) 7.559 ms
 12.83.101.149 (12.83.101.149) 7.594 ms
 6 12.123.236.113 (12.123.236.113) 34.023 ms 33.977 ms 34.665 ms
 7 * * *
 8 * * *

Edit:

Getting additional reports of the same outage in IL, CA: https://www.reddit.com/r/sysadmin/comments/9z4gsv/8888_google_primary_dns_unreachable_from_att/