> IPv6 can work side by side with IPv4 on the servers, but it cannot replace IPv4. Facebook is famously IPv6-only internally (and as of 2016, 60% of user traff

> IPv6 can work side by side with IPv4 on the servers, but it cannot replace IPv4. Facebook is famously IPv6-only internally (and as of 2016, 60% of user traffic was IPv6-only): * https://www.internetsociety.org/resources/deploy360/2014/case-study-facebook-moving-to-an-ipv6-only-internal-network/ https://www.internetsociety.org/resources/deploy360/2014/cas... * https://engineering.fb.com/2017/01/17/production-engineering/legacy-support-on-ipv6-only-infra/ https://engineering.fb.com/2017/01/17/production-engineering... * https://www.youtube.com/watch?v=lU_24f6Wr7E https://www.youtube.com/watch?v=lU_24f6Wr7E Microsoft and Google are IPv6-only single-stack (or moving in that direction) on their internal corporate networks: * https://www.arin.net/blog/2019/04/03/microsoft-works-toward-ipv6-only-single-stack-network/ https://www.arin.net/blog/2019/04/03/microsoft-works-toward-... * https://www.youtube.com/watch?v=nd0vgU6WbPo https://www.youtube.com/watch?v=nd0vgU6WbPo * https://www.youtube.com/watch?v=hb98hAb5_W8 https://www.youtube.com/watch?v=hb98hAb5_W8 Also Wells Fargo: * https://www.youtube.com/watch?v=EzTWjNUb4H4 https://www.youtube.com/watch?v=EzTWjNUb4H4 The main 'advantage' IPv4 has is inertia.