Service Upgrade

Anti-DDoS Proxy (Chinese Mainland) Back-to-origin CIDR Blocks Correction Notice

Jun 02, 2026

Anti-DDoS

Affected Time

2026-07-03 00:00:00 (UTC+08)

Anti-DDoS Proxy (Chinese Mainland) plans to activate new back-to-origin CIDR blocks on July 3, 2026.

The IP ranges originally scheduled for update

203.107.112.0/22

203.107.120.0/22

203.107.124.0/23

The IP ranges for update after correction

203.107.120.0/22

203.107.124.0/23

You can navigate to the Website Config page and click Back-To-Source CIDR Blocks in the upper-right corner or use OpenAPI to obtain the complete list of back-to-origin CIDR blocks. We recommend using OpenAPI to obtain real-time updates on back-to-origin CIDR blocks.

IMPORTANT: If you have configured access control policies on your origin server to limit source IP addresses, we suggest updating the ACL policies as soon as possible.

If you have any questions, submit a ticket or contact us in the DingTalk service group for consultation. Thank you for your support and cooperation.