You can contribute to our attempts to find the bad router card here: https://twitter.com/alexstamos/status/1336099461622157312
Almost certainly 12.242.117.22
Almost certainly 12.242.117.22
It’s not impossible that people from AT&T read messages posted there.
You people are amazing!
My mobile.twitter.com traceroute prefers going through that path, as does en.wikipedia.org (both of which have sucked for me) while a Google route (to 172.217.6.78) hops through 12.122.149.186.