|Number of private zones||500||You can create up to 500 private zones under an Alibaba Cloud account.|
|Number of VPCs associated with a private zone||100||You can associate a private zone with up to 100 Virtual Private Clouds (VPCs).|
|Number of DNS records||10,000||You can add up to 10,000 Domain Name System (DNS) records to each private zone.|
|Number of queries per second sent by an ECS instance||5,000 per second||Each Elastic Compute Service (ECS) instance can send up to 5,000 DNS queries per second.|
The 99.9% availability stipulated in the service level agreement (SLA) may be compromised if the number of DNS queries sent per second exceeds the upper limit.