Advanced nameservers included with Foundation DNS are an opt-in configuration.
Before you begin
Before opting in for advanced nameservers, consider the following:
The advantages that come with Foundation DNS advanced nameservers are currently not available for custom nameservers. Make sure you only use one at a time.
Differences from standard nameservers
Some behaviors are different from standard Cloudflare nameservers:
Wildcard records: if moving from standard Cloudflare nameservers to Foundation DNS advanced nameservers, make sure to explicitly create records for subdomains currently covered by wildcard records (*.example.com).
Subdomain delegation: once a subdomain is delegated via NS records, Cloudflare will not serve any other records (such as A, TXT, or CNAME) on that subdomain from the parent zone, even if those records exist.
Example
DNS management for example.com | Type | Name | Content | |
-------- | -------- | ------------------------- | | NS | www |
ns1.externalhost.com | | NS | www | ns2.externalhost.com | | TXT | www |
"5bb16e6b5a444eedb48ace40c471bcc9" | | A | www | 192.0.2.1 |
In this example, the TXT record and the A record for www.example.com will not be served.
Enable on a zone
To enable advanced nameservers on an existing zone: