> Isn’t essentially the entire US on CG-NAT for IPv4 on mobile data? T-Mobile, for one, has had their handsets IPv6-only for a few years, so if your Android/iO

> Isn’t essentially the entire US on CG-NAT for IPv4 on mobile data? T-Mobile, for one, has had their handsets IPv6-only for a few years, so if your Android/iOS does a DNS lookup and gets an AAAA record back, it will skip CG-NAT. T-Mobile presenting at NANOG in 2018 on IPv6: * https://www.youtube.com/watch?v=d6oBCYHzrTA https://www.youtube.com/watch?v=d6oBCYHzrTA And Rocky Mountain IPv6 Taskforce in 2017: * https://www.youtube.com/watch?v=nNMNglk_CvE https://www.youtube.com/watch?v=nNMNglk_CvE Further data: > Chances are if you use the Internet on your smartphone, you are connecting via IPv6. According to the Internet Society’s 2018 State of IPv6 Deployment,[1] 80% of smartphones in the US on the major cellular network operators use IPv6 and major mobile networks are driving IPv6 adoption with Verizon Wireless at 84%, Sprint at 70%, T-Mobile USA at 93%, and AT&T Wireless at 57%. Plus, some mobile networks are taking the step to run IPv6-only to simplify network operations and reduce costs. * https://www.arin.net/blog/2020/01/16/mobile-edge-of-the-internet-is-rapidly-moving-to-ipv6/ https://www.arin.net/blog/2020/01/16/mobile-edge-of-the-inte... Though some folks aren't happy with the implementation: > But from my own experience, neither T-Mobile nor AT&T allows inbound traffic to the phone's IPv6 address. This negates some of the advantages of having a globally routable IPv6 address. * https://isc.sans.edu/diary/27814 https://isc.sans.edu/diary/27814