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Private DNS
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    Use Limits

    Last updated: 2023-04-25 15:02:53
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      Private DNS Use Limits

      Currently, the following limits and restrictions apply to Private DNS:
      Notes
      Finance regions are visible to group cloud users and financial users.
      If you don't use Tencent Cloud's default DNS servers 183.60.83.19 and 183.60.82.98, you will be unable to use the Private DNS service. If you need to modify the DNS server, see Getting Private IP Addresses and Setting DNS.
      For more scenario requirements, provide your feedback via your rep or submit a ticket.
      Item
      Limit
      Description
      Number of DNS records
      100,000
      Up to 100,000 DNS records can be added under each UIN account.
      Number of domains
      500
      Up to 500 private domains can be created under each UIN account.
      TTL
      1 - 86400s
      TTL is the retention time of a DNS record on the DNS server and can be customized. There is a cache TTL mechanism for DNS queries. The DNS queries in Private DNS are counted based on the actual origin-pull requests and billed. You need to set the local NSCD cache to reduce origin pulls.
      Available regions
      Beijing, Shanghai, Guangzhou, Chengdu, Chongqing, Wuhan, Jinan, Shijiazhuang, Nanjing,Hefei, Shenyang, Changsha, Zhengzhou, Xi'an, Fuzhou, Hangzhou, Hong Kong (China), Silicon Valley,Singapore, Frankfurt, Jakarta, Bangkok, Mumbai, Virginia, Tokyo,Seoul, Toronto, Beijing Finance, Shanghai Finance, Shenzhen Finance
      An available region is a VPC region that can be associated with a private domain.
      Private domain creation
      The system supports creating TLDs conforming to IANA by default. To create custom TLDs, purchase Value-Added Service – Non-Standard TLDs first.
      Reference: Root Zone Database.
      DNS queries per second
      2,000 QPS per VPC
      If the DNS queries per second exceeds the threshold, a risk of request rate limit will rise, and the availability (99.99%) stated in SLA will not be guaranteed.</td>
      Recursive subdomain resolution
      -
      After the Recursive Subdomain Resolution feature of Private DNS is enabled, queries for a subdomain for which no records are set will be forwarded to the Public DNS. If this feature is not enabled, such queries cannot be properly resolved.
      CNAME flattening
      -
      If you have set a CNAME record, the target IP of the CNAME record will be synchronously returned after the CNAME flattening feature is enabled. We recommend you enable the Recursive Subdomain Resolution feature before using this feature. Otherwise, no final result can be returned if the target IP of the CNAME record requires query in the Public DNS.

      Round-Robin DNS Record Limits

      Notes
      "Number of Round-Robin DNS Records" refers to the number of records that can be added under the same host and the same record type.
      Those out of the limit cannot be properly added. To set the number of round-robin DNS records, purchase Value-Added Service Packages first.
      Record Type
      Number of Round-Robin DNS Records
      Remarks
      A
      10
      -
      AAAA
      10
      -
      TXT
      20
      Weight setting is unavailable for round-robin DNS of TXT records.
      CNAME
      5
      -
      MX
      50
      -
      PTR
      The PTR record does not support round-robin DNS.
      -
      
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