Since this is a one-off purchase, it's absolutely essential to guarantee, at the moment the VPS is purchased, what can be guaranteed to exist in the future - and IPv6 is the future. However, we have no internal technical differences on the dedicated servers (it's the same one we use for our main customers) and as such, these offers will also have IPv4 NAT and NAT64 as long as the main offer (to which this purchase is always pegged) does also offer them. In the same sense, if a given server of the main offer has a full IPv4 + full IPv6, we'll offer it as well.