Child-To-Parent Synchronization
Quick facts
Purpose
Child-To-Parent Synchronization
CSYNC is one of the DNS resource record (RR) types defined by RFC 7477.
Example
example.com. 3600 IN CSYNC 1 3 A AAAA MX
Related record types
Frequently asked questions
Used for DNS resolution and zone configuration.
In the DNS management panel of your registrar or DNS provider (for example Cloudflare or Route53).
Sources & standards
Updated 2026-08-18
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