When a new service is created in Aiven, a cloud service provider will dynamically assign a public IP address from their connection pool. This IP address is not a permanent one, because with every service node update (failover, maintenance upgrade or cloud migration) the IP address will change as Aiven will create a new VM, migrate to it and then retire the older node.
You can however create a VPC and create a peering connection to your own cloud account. This can be used in case you would like to limit connectivity, and keep your service instances isolated from the public-internet. For more information, please see Using VPC Peering article.
When a new service is being provisioned, the host name for your service may be setup with one of the following DNS zones depending on the available zoning pool:
project-service.X.aivencloud.com (where X stands for a, b, c, etc.)
Additional articles may be found on our Aiven Support page.
If you have any questions, please feel free to reach out to our Support and let us know.