Selfhosted
A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.
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After a bit of research, I'm forced by facts (NS records can be cached for an undetermined time) to see what you're saying. Thank you for teaching me.
The workings are, of course, a bit more complicated than what either of us have said (here's a taste), but there is a situation as you describe, where separating the registrar from the name servers, and the name servers from the domain, could save the domain from going down.
Well, I kinda simplified it, but yes, the root servers will keep the NS records as long as nothing else updates it (or nobody requests it for longer than the TTL that came with the last lookup) which is why it works.
Happy to help.