Alibaba Cloud DNS PrivateZone is billed in pay-as-you-go mode. You are charged for authoritative zones and the resolver feature.
Authoritative zones: billed by basic configurations and the number of back-to-origin requests. Bills are generated and settled on a daily basis. If you delete a zone within the same day you create the zone, you are not charged.
Resolver feature: billed by the number of source IP addresses of an outbound endpoint and the number of DNS requests that an outbound endpoint forwards. Bills are settled on a daily basis.
You create three zones in Account A, including example.com, example.aliyundoc.com, and inner.example.local.
The DNS server receives 64,131 back-to-origin requests from the three zones in Account A one day.
TTL caching is used for DNS requests. In each zone, the number of billable back-to-origin requests per day is the number of requests minus the number of cache hits within the TTL period.
Assume that the TTL for the domain name www.example.com is set to 30 seconds and 1,000 requests per second are sent to the DNS. In this case, all requests within the TTL period are free of charge. The one request that is sent after the specified TTL period expires is billed. All subsequent requests that are sent within a new TTL period are free of charge.
You can view the total number of back-to-origin requests on the Query Volume page in the Alibaba Cloud DNS console.
A longer TTL period leads to fewer back-to-origin requests and incurs lower fees. However, it takes longer for the change of an IP address for a domain name within the corresponding TTL period to take effect.
A shorter TTL period leads to more back-to-origin requests and incurs higher fees. However, the change of an IP address for a domain name within the corresponding TTL period can take effect faster.
The PrivateZone service is suspended 24 hours after you receive an overdue bill notice.
The system stops billing when the PrivateZone service is suspended. Your PrivateZone service remains valid if you recharge your account within 24 hours after you receive an overdue bill notice. Your zones are retained for seven days after you receive an overdue bill notice. Your zones are automatically released unless you recharge your account before the seven-day grace period ends.
You receive a message or an email notification one day before the zones are released. The zone configurations and data are permanently deleted and cannot be restored after they are deleted.
If you recharge your account within seven days, the service automatically resumes.