For regional external passthrough Network Load Balancers, you can reserve specific or automatically

## Feature Feature For regional external passthrough Network Load Balancers, you can reserve specific or automatically allocated bring your own IP (BYOIP) IPv6 addresses before creating a load balancer, so that the IPv6 address persists independently of the load balancer's lifecycle. You can also promote an ephemeral BYOIP IPv6 address that is in use by a load balancer to a reserved static IP address. For more information, see the following documentation: * [Set up a regional external passthrough Network Load Balancer with a backend service](https://cloud.google.com/load-balancing/docs/network/setting-up-network-backend-service#byoip-ipv6). * [Set up a regional external passthrough Network Load Balancer for multiple IP protocols](https://cloud.google.com/load-balancing/docs/network/setting-up-networklb-multiple-protocols#byoip-ipv6) * [Set up a regional external passthrough Network Load Balancer with zonal NEGs](https://cloud.google.com/load-balancing/docs/network/setting-up-network-zonal-neg#byoip-ipv6) This feature is in **Preview**.