Affected Product

Aliyun Public Authoritative DNS (CloudDNS)

Content

To further enhance the security and stability of our product, Aliyun CloudDNS will implement certain functional optimizations starting from August 30, 2025 (UTC+8). This update will not affect your normal service usage or existing DNS resolution records.

The following are the key changes included in this update:

• TXT Record Length Limitation Set to 8192 Characters

To mitigate the risk of DNS amplification attacks via TXT records and enhance system security, CloudDNS will introduce a new restriction: the total character length of a TXT record is now limited to 8192 characters.If your current configuration exceeds this limit, please consolidate or reduce the number of TXT records before August 30, 2025, to ensure continued functionality.

• Renaming of Public DNS SLA Agreement

To better reflect the actual use cases and technical implementation of the service, the name used in the Public DNS Service Level Agreement (SLA) has been updated to "Mobile Resolution HTTPDNS". This is a name-only change, and no other terms or SLA commitments have been modified.

Thank you for your continued trust and support in Aliyun CloudDNS. We remain committed to continuously improving the security, stability, and performance of our DNS services.