|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||100,000||You can add up to 100,000 Domain Name System (DNS) records to each private zone. When the Recursive resolution of the proxy mode is enabled，You can add up to 4,000 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.|
|Extensive domain name analysis||-||When PrivateZone enables the subdomain recursive resolution proxy function, the intranet general resolution will not take effect. When and PrivateZone turns off the subdomain recursive resolution proxy function, it supports pan resolution.|
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