/64 IPv6 block are available on instances in Paris and Amsterdam (except for C1 and C2 instances). However, note that for our legacy servers including START and VC1 /64 IPv6 block is available at the cost of an archive.
The subnetwork is automatically activated on new instances. To benefit from an IPv6 /64 subnetwork on an existing instance, first archive it and then restart it.
Information about the allocated sub-network is available on the Instance Information page: