Definitely not a failed technology in my personal experience. As mentioned in the report Arcep mandates IPv6 for 5G licensees. Turns out they put out the work and 4G has IPv6 retrofitted basically everywhere as well as a side effect.
ISPs have deployed IPv6 quite successfully now. Barring some legacy connections (DOCSYS 2 or something mostly) that still get no IPv6, basically all new connections have IPv6 as a default, and old ones have either already been migrated (including DSL) or are in the (sometimes long) rollout process. Some tied the IPv6 migration with an IPv4 CGNAT move, which makes IPv6 very attractive: hobbyists have to ride on IPv6 for external reachability, while casual uses like gaming, voip, conferencing, and whatnot benefit from relay-less p2p connections by preferring IPv6.
For the four major ISPs, this report from 2021 shows 89, 71 and 49% active IPv6 on mobile (not just 5G), with a 1% outlier that should have gotten its act together by now, and 99, 89, 53 and 22% for landlines, and projects 99, 93, 80 and 40% deployment in 2023 (which sounds about right for today in my experience), and 99, 97, 95 and 85% deployment for landlines in 2025, at which point CGNAT won't be an issue for most and IPv4 basically becomes legacy technology provided things also move forward server side.
Comments
Definitely not a failed technology in my personal experience. As mentioned in the report Arcep mandates IPv6 for 5G licensees. Turns out they put out the work and 4G has IPv6 retrofitted basically everywhere as well as a side effect.
ISPs have deployed IPv6 quite successfully now. Barring some legacy connections (DOCSYS 2 or something mostly) that still get no IPv6, basically all new connections have IPv6 as a default, and old ones have either already been migrated (including DSL) or are in the (sometimes long) rollout process. Some tied the IPv6 migration with an IPv4 CGNAT move, which makes IPv6 very attractive: hobbyists have to ride on IPv6 for external reachability, while casual uses like gaming, voip, conferencing, and whatnot benefit from relay-less p2p connections by preferring IPv6.
For the four major ISPs, this report from 2021 shows 89, 71 and 49% active IPv6 on mobile (not just 5G), with a 1% outlier that should have gotten its act together by now, and 99, 89, 53 and 22% for landlines, and projects 99, 93, 80 and 40% deployment in 2023 (which sounds about right for today in my experience), and 99, 97, 95 and 85% deployment for landlines in 2025, at which point CGNAT won't be an issue for most and IPv4 basically becomes legacy technology provided things also move forward server side.
https://www.arcep.fr/cartes-et-donnees/nos-publications-chif...