ProxCP Admin - Manage IPv6
From ProxCP Documentation
Overview
ADMIN > Settings > Manage IPv6
On this page, you can view, add, and delete IPv6 pools for individual VPS IPv6 assignment. You can have a separate pool for each Proxmox node.
IPv6 Subnet Assignment
If you are using IPv6 Subnet assignment mode, each VPS will get a single /64 subnet assignment when it is requested by a user. A user can request only 1 IPv6 subnet for each VPS.
IPv6 Single Assignment
If you are using IPv6 Single assignment mode, each VPS will get a single IPv6 assignment when it is requested by a user. A user can request up to the maximum amount of IPv6 addresses defined in ProxCP Settings.