Lightsail IPv6 addresses

While Lightsail supports IPv6, you can't assign static IPv6 addresses. They'll remain the same for a given instance, even if you stop and start it, but if you delete an instance and recreate it for example, you'll have to use a new IPv6 address and change your DNS records accordingly.

Instances that have IPv4 connectivity cost more than IPv6-only instances due to the increased costs involved with holding IPv4 addresses.