@stanford @kobayashi90 well, my notation proposal is just a way to note down the #IPv6 and it could allow for a "#4over6" transitional mechalism (similar to #6over4) by specifying a fixed /96 subnet for automatic PAT+NAT so we'd not have shit like #DualStackLite with #CGNAT which is just horrible.

Bonus Points if your (mobile) ISP uses RFC1918 adress spaces, bricking #VPN's!

https://en.m.wikipedia.org/wiki/6over4
https://en.m.wikipedia.org/wiki/Carrier-grade_NAT