Pointing part of your domain elsewhere.
WHEN YOU NEED IT
A subdomain managed by a different provider A service requiring control of a subdomain A separate environment with its own DNS
HOW IT WORKS
An NS record for the subdomain points at the other provider's nameservers.
Queries for that subdomain are then answered there rather than at Cloudflare.
SETTING IT UP
Add NS records in Cloudflare for the subdomain, with the other provider's nameservers as values.
Remove any A or CNAME records for that subdomain, which would conflict.
WHAT THIS MEANS
You no longer control that subdomain's records at Cloudflare. Changes must be made at the delegated provider.
WHEN NOT TO USE IT
For an ordinary subdomain on your own hosting. A simple A record is correct.
Delegation adds complexity and a dependency.
THE PROXY
A delegated subdomain cannot be proxied by Cloudflare, since Cloudflare is not answering for it.
CHECKING
A DNS lookup for the subdomain's NS records confirms the delegation is in place.
